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Fs(;)17 b(:)g(:)g(:)33 b(;)17 b(s)3220 1190 y Fp(k)3302 1175 y Fw(=)39 b Fs(t)3452 1190 y Fp(k)257 1295 y Fw(in)c Fu(R)p Fw(,)j(a)d(substitution)g Fs(\033)j Fw(:)33 b Fu(V)42 b(!)32 b(T)26 b Fw(\()p Fu(F)10 b Fs(;)17 b Fu(V)8 b Fw(\))35 b(with)h Fu(D)s Fw(\()p Fs(\033)t Fw(\))c(=)h Fu(V)8 b Fs(ar)s Fw(\()p Fs(\032)p Fw(\))q(,)37 b(a)e(con)m(text)i Fs(C)7 b Fw([)36 b(],)257 1416 y(and)44 b(ground)g(constructor)g(terms)g Fs(u)1665 1431 y Fq(1)1704 1416 y Fs(;)17 b(:)g(:)g(:)f(;)h(u)1979 1431 y Fp(k)2064 1416 y Fw(suc)m(h)45 b(that)f Fs(s)i Fw(=)g Fs(C)7 b Fw([)p Fs(l)r(\033)t Fw(],)47 b Fs(t)g Fw(=)f Fs(C)7 b Fw([)p Fs(r)s(\033)t Fw(],)257 1536 y Fs(s)303 1551 y Fp(i)331 1536 y Fs(\033)32 b Fu(!)518 1500 y Fr(\003)518 1561 y(R)578 1570 y Fm(n)p Fk(\000)p Fl(1)731 1536 y Fs(u)787 1551 y Fp(i)847 1536 y Fw(and)h Fs(t)1072 1551 y Fp(i)1100 1536 y Fs(\033)f Fu(!)1287 1500 y Fr(\003)1287 1561 y(R)1347 1570 y Fm(n)p Fk(\000)p Fl(1)1499 1536 y Fs(u)1555 1551 y Fp(i)1616 1536 y Fw(for)g(all)e(1)e Fu(\024)g Fs(i)g Fu(\024)g Fs(k)s Fw(.)404 1764 y(The)36 b Fv(depth)g Fw(of)f(a)g(rewrite)h(step)g Fs(s)d Fu(!)1790 1779 y Fr(R)1887 1764 y Fs(t)j Fw(is)f(the)h(minim)m(um)d Fs(n)j Fw(with)f Fs(s)e Fu(!)3168 1779 y Fr(R)3228 1787 y Fm(n)3307 1764 y Fs(t)p Fw(.)53 b(A)257 1885 y(CTRS)34 b Fu(R)f Fw(is)f(called)f Fv(level-c)-5 b(on\015uent)32 b Fw(if)f(ev)m(ery)k(relation)30 b Fu(!)2490 1900 y Fr(R)2550 1908 y Fm(n)2630 1885 y Fw(is)i(con\015uen)m(t.)404 2005 y(The)37 b(unconditional)d(TRS)j(obtained)f(from)f(a)i(CTRS)g Fu(R)g Fw(b)m(y)g(omitting)c(the)k(con-)257 2125 y(ditions)29 b(in)h(its)g(rewrite)g(rules)h(is)f(denoted)h(b)m(y)g Fu(R)2061 2140 y Fp(u)2106 2125 y Fw(.)42 b(Note)31 b(that)f(\()p Fu(F)9 b Fs(;)17 b Fu(R)2866 2140 y Fp(u)2911 2125 y Fw(\))30 b(is)g(an)g(uncon-)257 2246 y(ditional)35 b(TRS)i(in)f(the)i (usual)e(sense)j(pro)m(vided)f(that)e(\()p Fu(F)10 b Fs(;)17 b Fu(R)p Fw(\))37 b(is)f(a)h(2-CTRS.)g(This)h(is)257 2366 y(not)f(true)g(for)f(3-CTRSs)h(b)s(ecause)h(rules)f(of)f(t)m(yp)s (e)i(3)e(ma)m(y)h(con)m(tain)f(v)-5 b(ariables)35 b(on)i(the)257 2487 y(righ)m(t-hand)c(sides)i(of)f(rules)g(whic)m(h)g(do)g(not)g(o)s (ccur)h(on)f(the)g(corresp)s(onding)g(left-hand)257 2607 y(side.)46 b(F)-8 b(or)32 b(a)h(CTRS)h Fu(R)q Fw(,)f(notions)g(lik)m(e) f(left-linearit)m(y)-8 b(,)31 b(orthogonalit)m(y)-8 b(,)31 b(and)i(construc-)257 2727 y(tor)f(term)g(are)g(de\014ned)h(via)f(the)g (system)i Fu(R)1879 2742 y Fp(u)1924 2727 y Fw(.)43 b(So)32 b(a)g(CTRS)h Fu(R)g Fw(is)e(for)h(instance)g(called)257 2848 y(orthogonal)g(if)g Fu(R)920 2863 y Fp(u)998 2848 y Fw(is)h(orthogonal.)43 b(Since)34 b(the)f(prop)s(erties)g(men)m (tioned)g(ab)s(o)m(v)m(e)h(solely)257 2968 y(dep)s(end)k(on)f(the)g (left-hand)e(sides)j(of)e(the)h(system)g Fu(R)2268 2983 y Fp(u)2313 2968 y Fw(,)g(they)h(are)f(w)m(ell-de\014ned)g(ev)m(en)257 3088 y(if)e Fu(R)435 3103 y Fp(u)516 3088 y Fw(is)h(not)g(a)f(TRS)i(in) e(the)i(usual)f(sense.)56 b(In)36 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y Fu(!)27 b Fs(t)1820 4428 y Fq(1)1860 4413 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)2141 4428 y Fp(k)2211 4413 y Fu(!)28 b Fs(t)2374 4428 y Fp(k)2457 4413 y Fw(are)41 b(sub)5 b(ject)42 b(to)e(the)h(addi-)257 4533 y(tional)33 b(constrain)m(t)h(that)h(ev)m(ery)h Fs(t)1504 4548 y Fp(j)1576 4533 y Fw(is)e(a)g(ground)h(normal)e(form)g(with)h(resp)s (ect)i(to)f Fu(R)3423 4548 y Fp(u)3468 4533 y Fw(.)257 4653 y(According)i(to)f(the)h(next)g(prop)s(osition,)e(ev)m(ery)k(CTRS) e(with)f(strict)g(equalit)m(y)g(can)h(b)s(e)257 4774 y(view)m(ed)d(as)f(a)f(normal)f(CTRS.)257 5002 y Fo(Prop)s(osition)36 b(2.2)49 b Fv(L)-5 b(et)36 b Fw(\()p Fu(F)9 b Fs(;)17 b Fu(R)p Fw(\))36 b Fv(b)-5 b(e)35 b(a)g(CTRS)g(with)g(strict)h(e)-5 b(quality.)47 b(The)35 b(fol)5 b(lowing)257 5122 y(statements)35 b(ar)-5 b(e)35 b(e)-5 b(quivalent)34 b(for)h(al)5 b(l)34 b(terms)h Fs(s)g Fv(and)f Fs(t)h Fv(in)g Fu(T)25 b Fw(\()p Fu(F)10 b Fs(;)17 b Fu(V)8 b Fw(\))p Fv(:)393 5326 y(i.)48 b Fs(s)29 b Fv(and)f Fs(t)h Fv(c)-5 b(an)28 b(b)-5 b(e)28 b(r)-5 b(e)g(duc)g(e)g(d)28 b(to)h(a)g(c)-5 b(ommon)27 b(gr)-5 b(ound)28 b(c)-5 b(onstructor)29 b(term)g(in)f Fw(\()p Fu(F)9 b Fs(;)17 b Fu(R)p Fw(\))p Fv(,)1852 5637 y Fw(5)p eop %%Page: 6 6 6 5 bop 363 573 a Fv(ii.)48 b Fs(s)p Fw(==)p Fs(t)29 b Fv(c)-5 b(an)28 b(b)-5 b(e)29 b(evaluate)-5 b(d)28 b(to)h Fs(tr)s(ue)f Fv(in)h(the)g(normal)f(CTRS)g Fw(\()p Fu(F)18 b(])9 b(F)2966 588 y Fp(eq)3037 573 y Fs(;)17 b Fu(R)3165 531 y Fr(0)3197 573 y Fu(])9 b(R)3357 588 y Fp(eq)3427 573 y Fw(\))p Fv(,)257 776 y(wher)-5 b(e)35 b Fu(F)614 791 y Fp(eq)685 776 y Fv(,)g Fu(R)834 791 y Fp(eq)905 776 y Fv(,)g(and)f Fu(R)1243 734 y Fr(0)1301 776 y Fv(ar)-5 b(e)35 b(de\014ne)-5 b(d)34 b(as)g(fol)5 b(lows:)373 980 y(1.)48 b Fu(F)583 995 y Fp(eq)681 980 y Fw(=)28 b Fu(f)p Fw(==)o Fs(;)17 b Fu(^)p Fs(;)g(tr)s(ue;)g(f)11 b(al)r(se)p Fu(g)p Fv(,)34 b(and)h Fu(^)g Fv(is)g(assume)-5 b(d)34 b(to)h(b)-5 b(e)34 b(right-asso)-5 b(ciative.)373 1183 y(2.)48 b(The)34 b(TRS)h Fu(R)1015 1198 y Fp(eq)1121 1183 y Fv(c)-5 b(onsists)34 b(of)h(the)g(rules)g(\()p Fu(C)41 b Fv(is)34 b(the)h(set)g(of)g(c)-5 b(onstructors)34 b(in)h Fu(R)p Fv(\))1590 1403 y Fs(c)p Fw(==)p Fs(c)83 b Fu(!)g Fs(tr)s(ue)488 b Fu(8)35 b Fw(0)p Fv(-ary)g Fs(c)27 b Fu(2)i(C)1581 1523 y Fs(c)p Fw(==)p Fs(d)83 b Fu(!)g Fs(f)11 b(al)r(se)439 b Fu(8)p Fs(c;)17 b(d)27 b Fu(2)h(C)7 b Fs(;)17 b(c)27 b Fu(6)p Fw(=)h Fs(d)623 1644 y(c)p Fw(\()p Fs(x)758 1659 y Fq(1)797 1644 y Fs(;)17 b(:)g(:)g(:)f(;)h(x)1071 1659 y Fp(n)1118 1644 y Fw(\)==)p Fs(c)p Fw(\()p Fs(y)1436 1659 y Fq(1)1475 1644 y Fs(;)g(:)g(:)g(:)f(;)h (y)1742 1659 y Fp(n)1788 1644 y Fw(\))83 b Fu(!)2092 1569 y Ft(V)2175 1595 y Fp(n)2175 1673 y(i)p Fq(=1)2293 1644 y Fw(\()p Fs(x)2386 1659 y Fp(i)2414 1644 y Fw(==)p Fs(y)2614 1659 y Fp(i)2642 1644 y Fw(\))g Fu(8)35 b Fs(n)p Fv(-ary)g Fs(c)28 b Fu(2)g(C)594 1764 y Fs(c)p Fw(\()p Fs(x)729 1779 y Fq(1)769 1764 y Fs(;)17 b(:)g(:)g(:)f(;)h(x)1043 1779 y Fp(n)1090 1764 y Fw(\)==)p Fs(d)p Fw(\()p Fs(y)1417 1779 y Fq(1)1455 1764 y Fs(;)g(:)g(:)g(:)f(;)h(y)1722 1779 y Fp(m)1788 1764 y Fw(\))83 b Fu(!)g Fs(f)11 b(al)r(se)439 b Fu(8)p Fs(c;)17 b(d)27 b Fu(2)h(C)7 b Fs(;)17 b(c)27 b Fu(6)p Fw(=)h Fs(d)1477 1885 y(tr)s(ue)22 b Fu(^)g Fs(x)84 b Fu(!)f Fs(x)1427 2005 y(f)11 b(al)r(se)23 b Fu(^)f Fs(x)84 b Fu(!)f Fs(f)11 b(al)r(se)373 2269 y Fv(3.)48 b(and)41 b Fu(R)782 2227 y Fr(0)845 2269 y Fw(=)f Fu(f)p Fs(l)i Fu(!)d Fs(r)k Fu(\()d Fs(s)1494 2284 y Fq(1)1533 2269 y Fw(==)p Fs(t)1720 2284 y Fq(1)1799 2269 y Fu(!)g Fs(tr)s(ue;)17 b(:)g(:)g(:)32 b(;)17 b(s)2403 2284 y Fp(k)2445 2269 y Fw(==)p Fs(t)2632 2284 y Fp(k)2715 2269 y Fu(!)40 b Fs(tr)s(ue)17 b Fu(j)g Fs(l)40 b Fu(!)g Fs(r)j Fu(\()501 2390 y Fs(s)547 2405 y Fq(1)614 2390 y Fw(=)28 b Fs(t)753 2405 y Fq(1)793 2390 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)1074 2405 y Fp(k)1144 2390 y Fw(=)27 b Fs(t)1282 2405 y Fp(k)1353 2390 y Fu(2)h(R)q(g)257 2618 y Fv(Pr)-5 b(o)g(of)67 b Fw(Similar)30 b(to)i(the)h(pro)s(of)e(for)h (unconditional)f(TRSs;)i(see)h([1].)645 b Fj(\003)404 2838 y Fw(F)-8 b(rom)28 b(no)m(w)j(on)f(rewrite)g(rules)g(of)f(a)h (CTRS)h(with)e(strict)h(equalit)m(y)f(will)f(b)s(e)i(written)257 2958 y(as)j Fs(l)d Fu(!)d Fs(r)k Fu(\()c Fs(s)811 2973 y Fq(1)850 2958 y Fw(==)p Fs(t)1037 2973 y Fq(1)1077 2958 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)1358 2973 y Fp(k)1401 2958 y Fw(==)o Fs(t)1587 2973 y Fp(k)1630 2958 y Fw(.)404 3079 y(In)35 b(the)h(follo)m(wing,)d(w)m(e)j(need)g(a)f (result)g(obtained)g(b)m(y)h(Staples)f([18)o(].)51 b(An)36 b(abstract)257 3199 y(reduction)28 b(system)i(\(ARS\))e Fu(A)1388 3214 y Fq(2)1455 3199 y Fw(=)g(\()p Fs(A;)17 b Fu(!)1814 3214 y Fq(2)1853 3199 y Fw(\))28 b(is)f(called)g(a)h Fv(r)-5 b(e\014nement)27 b Fw(of)h(another)g(ARS)257 3319 y Fu(A)337 3334 y Fq(1)417 3319 y Fw(=)40 b(\()p Fs(A;)17 b Fu(!)788 3334 y Fq(1)827 3319 y Fw(\))40 b(if)e Fu(!)1101 3334 y Fq(1)1141 3319 y Fu(\022!)1318 3283 y Fr(\003)1318 3344 y Fq(2)1357 3319 y Fw(.)66 b(Suc)m(h)41 b(a)f(re\014nemen)m(t)h(is)e(called)g Fv(c)-5 b(omp)g(atible)39 b Fw(if)g(for)g(all)257 3440 y Fs(a)47 b Fu(!)455 3404 y Fr(\003)455 3465 y Fq(2)541 3440 y Fs(b)p Fw(,)g(there)e(is)e(a)g Fs(c)k Fu(2)g Fs(A)d Fw(suc)m(h)h(that)f Fs(a)j Fu(!)2089 3404 y Fr(\003)2089 3465 y Fq(1)2175 3440 y Fs(c)c Fw(and)h Fs(b)k Fu(!)2650 3404 y Fr(\003)2650 3465 y Fq(1)2735 3440 y Fs(c)p Fw(.)77 b(Staples')44 b(result)257 3560 y(states)38 b(that)e(a)g(compatible)f(re\014nemen)m(t)j Fu(A)1905 3575 y Fq(2)1981 3560 y Fw(of)e Fu(A)2176 3575 y Fq(1)2252 3560 y Fw(is)g(con\015uen)m(t)i(if)d(and)i(only)f(if)f Fu(A)3456 3575 y Fq(1)257 3681 y Fw(is)e(con\015uen)m(t.)45 b(In)33 b(fact,)g(w)m(e)h(also)e(need)i(the)f(follo)m(wing)d (generalization)g(of)j(this)f(result,)257 3801 y(a)i(pro)s(of)f(of)h (whic)m(h)g(can)g(b)s(e)h(found)f(in)f([15].)47 b(Let)35 b Fu(A)2176 3816 y Fq(1)2246 3801 y Fw(=)30 b(\()p Fs(A;)17 b Fu(!)2607 3816 y Fq(1)2645 3801 y Fw(\))34 b(and)g Fu(A)2988 3816 y Fq(2)3058 3801 y Fw(=)29 b(\()p Fs(A;)17 b Fu(!)3418 3816 y Fq(2)3457 3801 y Fw(\))257 3921 y(b)s(e)31 b(ARSs.)44 b(Let)31 b Fu(\030)g Fw(b)s(e)g(an)g(equiv)-5 b(alence)31 b(relation)e(on)i Fs(A)g Fw(suc)m(h)h(that)f Fu(!)2877 3936 y Fq(1)2916 3921 y Fu(\022!)3093 3885 y Fr(\003)3093 3946 y Fq(2)3163 3921 y Fw(and,)h(for)257 4042 y(all)38 b Fs(a)j Fu(!)592 4006 y Fr(\003)592 4066 y Fq(2)671 4042 y Fs(b)p Fw(,)h(there)f(are)f Fs(c;)17 b(d)40 b Fu(2)g Fs(A)g Fw(suc)m(h)i(that)d Fs(a)i Fu(!)2242 4006 y Fr(\003)2242 4066 y Fq(1)2321 4042 y Fs(c)p Fw(,)h Fs(b)f Fu(!)2614 4006 y Fr(\003)2614 4066 y Fq(1)2693 4042 y Fs(d)p Fw(,)h(and)e Fs(c)g Fu(\030)h Fs(d)p Fw(.)65 b(Let)257 4162 y Fs(i)33 b Fu(2)f(f)p Fw(1)p Fs(;)17 b Fw(2)p Fu(g)p Fw(.)50 b(If)35 b Fu(A)919 4177 y Fp(i)982 4162 y Fw(is)g(con\015uen)m(t)h(mo)s(dulo)d Fu(\030)j Fw(\(i.e.,)f(for)g(all)e Fs(c)2559 4126 y Fr(\003)2559 4187 y Fp(i)2597 4162 y Fu( )e Fs(a)h Fu(\030)h Fs(b)f Fu(!)3094 4126 y Fr(\003)3094 4187 y Fp(i)3165 4162 y Fs(d)p Fw(,)j(there)257 4283 y(are)d Fs(e;)17 b(f)38 b Fu(2)28 b Fs(A)k Fw(suc)m(h)h(that)e Fs(c)c Fu(!)1391 4246 y Fr(\003)1391 4307 y Fp(i)1458 4283 y Fs(e)h Fu(\030)g Fs(f)1723 4246 y Fr(\003)1723 4307 y Fp(i)1757 4283 y Fu( )f Fs(d)p Fw(\))k(and,)h(for)f(all)e Fs(a)f Fu(\030)g Fs(b)g Fu(!)2855 4246 y Fr(\003)2855 4307 y Fq(3)p Fr(\000)p Fp(i)3001 4283 y Fs(c)p Fw(,)j(there)i(is)d(a)257 4403 y Fs(d)e Fu(2)g Fs(A)k Fw(suc)m(h)i(that)f Fs(a)28 b Fu(!)1146 4367 y Fr(\003)1146 4428 y Fq(3)p Fr(\000)p Fp(i)1291 4403 y Fs(d)g Fu(\030)g Fs(c)p Fw(,)33 b(then)g Fu(A)1878 4418 y Fq(3)p Fr(\000)p Fp(i)2029 4403 y Fw(is)f(con\015uen)m (t)i(mo)s(dulo)d Fu(\030)p Fw(.)257 4736 y Fx(3)161 b(Almost)54 b(F)-13 b(unctional)54 b(CTRSs)257 4955 y Fw(W)-8 b(e)39 b(start)f(with)g(a)g(result)g(from)e(Bergstra)j(and)f(Klop)f([5].)60 b(They)40 b(ha)m(v)m(e)f(sho)m(wn)g(that)257 5075 y(orthogonal)e (normal)g(2-CTRS)i(satisfy)g(the)h(parallel)c(mo)m(v)m(es)j(lemma.)61 b(Hence)40 b(these)257 5196 y(systems)34 b(are)f(lev)m(el-con\015uen)m (t.)1852 5637 y(6)p eop %%Page: 7 7 7 6 bop 257 573 a Fo(De\014nition)36 b(3.1)49 b Fw(Let)31 b Fs(A)d Fw(:)g Fs(s)f Fu(!)1474 588 y Fp(p;l)q Fr(!)p Fp(r)r Fr(\()p Fp(c)1788 573 y Fs(t)k Fw(b)s(e)f(a)h(rewrite)f(step)h (in)f(a)g(CTRS)h Fu(R)g Fw(and)g(let)257 693 y Fs(q)h Fu(2)c(P)8 b Fs(os)p Fw(\()p Fs(s)p Fw(\).)44 b(The)33 b(set)g Fs(q)t Fu(n)p Fs(A)g Fw(of)f Fv(desc)-5 b(endants)31 b Fw(of)h Fs(q)k Fw(in)c Fs(t)h Fw(is)f(de\014ned)i(b)m(y:)376 994 y Fs(q)t Fu(n)p Fs(A)27 b Fw(=)677 790 y Ft(8)677 879 y(<)677 1059 y(:)807 873 y Fu(f)p Fs(q)t Fu(g)922 b Fw(if)32 b Fs(q)f(<)d(p)k Fw(or)h Fs(q)j Fu(k)c Fs(p;)807 993 y Fu(f)p Fs(p)22 b Fu(\001)g Fs(p)1027 1008 y Fq(3)1088 993 y Fu(\001)g Fs(p)1187 1008 y Fq(2)1259 993 y Fu(j)32 b Fs(r)1363 1009 y Fr(j)p Fp(p)1419 1018 y Fl(3)1485 993 y Fw(=)27 b Fs(l)1617 1009 y Fr(j)p Fp(p)1673 1018 y Fl(1)1711 993 y Fu(g)115 b Fw(if)32 b Fs(q)f Fw(=)d Fs(p)22 b Fu(\001)g Fs(p)2314 1008 y Fq(1)2375 993 y Fu(\001)g Fs(p)2474 1008 y Fq(2)2546 993 y Fw(with)32 b Fs(p)2817 1008 y Fq(1)2884 993 y Fu(2)c(V)8 b(P)h Fs(os)p Fw(\()p Fs(l)r Fw(\))807 1114 y Fu(;)1019 b Fw(otherwise.)257 1295 y(If)36 b Fs(Q)c Fu(\022)h(P)8 b Fs(os)p Fw(\()p Fs(s)p Fw(\),)36 b(then)g Fs(Q)p Fu(n)p Fs(A)g Fw(denotes)g(the)g(set) 2074 1220 y Ft(S)2157 1324 y Fp(q)r Fr(2)p Fp(Q)2314 1295 y Fs(q)t Fu(n)p Fs(A)p Fw(.)51 b(The)37 b(notion)d(of)h(descen-) 257 1415 y(dan)m(t)e(is)f(extended)j(to)d(rewrite)h(sequences)j(in)31 b(the)i(ob)m(vious)g(w)m(a)m(y)-8 b(.)257 1600 y Fo(De\014nition)36 b(3.2)49 b Fw(Let)42 b Fu(R)g Fw(b)s(e)f(a)g(CTRS.)i(W)-8 b(e)41 b(write)g Fs(s)33 b Fu(k)-72 b(!)2440 1615 y Fr(R)2500 1623 y Fm(n)2546 1600 y Fs(t)42 b Fw(if)e Fs(t)i Fw(can)f(b)s(e)h (obtained)257 1721 y(from)d Fs(s)i Fw(b)m(y)g(con)m(tracting)f(a)g(set) h(of)f(pairwise)g(disjoin)m(t)f(redexes)j(in)e Fs(s)g Fw(b)m(y)h Fu(!)3159 1736 y Fr(R)3219 1744 y Fm(n)3266 1721 y Fw(.)67 b(W)-8 b(e)257 1841 y(write)42 b Fs(s)32 b Fu(k)-72 b(!)p Fs(t)42 b Fw(if)f Fs(s)32 b Fu(k)-72 b(!)1004 1856 y Fr(R)1064 1864 y Fm(n)1111 1841 y Fs(t)42 b Fw(for)f(some)h Fs(n)h Fu(2)h Fi(N)9 b Fw(.)78 b(The)43 b(minim)m(um)38 b(suc)m(h)44 b Fs(n)e Fw(is)f(called)g(the)257 1962 y Fv(depth)33 b Fw(of)f Fs(s)g Fu(k)-72 b(!)p Fs(t)p Fw(.)43 b(The)34 b(relation)63 b Fu(k)-72 b(!)32 b Fw(is)g(called)f Fv(p)-5 b(ar)g(al)5 b(lel)34 b(r)-5 b(ewriting)p Fw(.)404 2147 y(The)38 b(parallel)c(mo)m(v)m(es)k(lemma)d(for)i(orthogonal)e (normal)g(2-CTRS)i(no)m(w)h(reads)g(as)257 2267 y(follo)m(ws.)257 2453 y Fo(Lemma)f(3.3)49 b Fv(If)k Fs(t)35 b Fu(k)-72 b(!)1115 2468 y Fr(R)1175 2476 y Fm(m)1238 2453 y Fs(t)1273 2468 y Fq(1)1366 2453 y Fv(and)52 b Fs(t)35 b Fu(k)-72 b(!)1721 2468 y Fr(R)1781 2476 y Fm(n)1828 2453 y Fs(t)1863 2468 y Fq(2)1902 2453 y Fv(,)58 b(then)53 b(ther)-5 b(e)53 b(is)g(a)g(term)g Fs(t)2998 2468 y Fq(3)3091 2453 y Fv(such)g(that)257 2573 y Fs(t)292 2588 y Fq(1)367 2573 y Fu(k)-72 b(!)445 2588 y Fr(R)505 2596 y Fm(n)551 2573 y Fs(t)586 2588 y Fq(3)688 2573 y Fv(and)61 b Fs(t)939 2588 y Fq(2)1014 2573 y Fu(k)-72 b(!)1092 2588 y Fr(R)1152 2596 y Fm(m)1214 2573 y Fs(t)1249 2588 y Fq(3)1289 2573 y Fv(.)126 b(Mor)-5 b(e)g(over,)68 b(the)62 b(r)-5 b(e)g(dexes)61 b(c)-5 b(ontr)g(acte)g(d)62 b(in)g Fs(t)3162 2588 y Fq(1)3236 2573 y Fu(k)-72 b(!)3314 2588 y Fr(R)3374 2596 y Fm(n)3421 2573 y Fs(t)3456 2588 y Fq(3)257 2693 y Fv(\()p Fs(t)332 2708 y Fq(2)407 2693 y Fu(k)g(!)485 2708 y Fr(R)545 2716 y Fm(m)607 2693 y Fs(t)642 2708 y Fq(3)682 2693 y Fv(\))29 b(ar)-5 b(e)29 b(the)g(desc)-5 b(endants)28 b(in)h Fs(t)1746 2708 y Fq(1)1815 2693 y Fv(\()p Fs(t)1890 2708 y Fq(2)1930 2693 y Fv(\))g(of)g(the)g(r)-5 b(e)g(dexes)28 b(c)-5 b(ontr)g(acte)g(d)29 b(in)g Fs(t)35 b Fu(k)-72 b(!)3314 2708 y Fr(R)3374 2716 y Fm(n)3421 2693 y Fs(t)3456 2708 y Fq(2)257 2814 y Fv(\()p Fs(t)35 b Fu(k)-72 b(!)445 2829 y Fr(R)505 2837 y Fm(m)568 2814 y Fs(t)603 2829 y Fq(1)642 2814 y Fv(\).)404 2999 y Fw(It)32 b(is)f(an)h(immediate)d (corollary)h(to)i(Lemma)e(3.3)i(that)f(ev)m(ery)j(orthogonal)c(normal) 257 3120 y(2-CTRS)g(is)f(lev)m(el-con\015uen)m(t.)43 b(It)29 b(is)g(our)g(next)i(goal)c(to)i(sho)m(w)i(that)e(almost)f (functional)257 3240 y(3-CTRS)46 b(ha)m(v)m(e)g(the)g(same)e(prop)s (ert)m(y)-8 b(.)82 b(It)45 b(should)g(b)s(e)h(p)s(oin)m(ted)e(out)h (that)g(orien)m(ted)257 3360 y(systems)k(whic)m(h)e(satisfy)g (condition)e(\(1\))h(in)g(De\014nition)f(3.4)i(w)m(ere)h(called)d Fv(pr)-5 b(op)g(erly)257 3481 y(oriente)g(d)32 b Fw(in)g([20].)257 3666 y Fo(De\014nition)k(3.4)49 b Fw(A)29 b(3-CTRS)f Fu(R)h Fw(with)f(strict)g(equalit)m(y)g(is)f(called)g Fv(almost)k(functional)257 3786 y Fw(if)c(it)g(is)g(orthogonal)f(and)i (ev)m(ery)i(rule)d Fs(l)j Fu(!)d Fs(r)k Fu(\()c Fs(s)2073 3801 y Fq(1)2112 3786 y Fw(==)p Fs(t)2299 3801 y Fq(1)2339 3786 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)2620 3801 y Fp(k)2663 3786 y Fw(==)o Fs(t)2849 3801 y Fp(k)2920 3786 y Fw(in)27 b Fu(R)h Fw(satis\014es:)377 3958 y(1.)48 b(If)37 b Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))35 b Fu(6\022)h(V)8 b Fs(ar)s Fw(\()p Fs(l)r 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Fs(\033)2714 4382 y Fq(1)2782 4367 y Fw(=)27 b Fs(r)2929 4382 y Fq(2)2969 4367 y Fs(\033)3024 4382 y Fq(2)3064 4367 y Fv(.)373 4568 y(2.)48 b(If)31 b Fs(t)k Fu(k)-72 b(!)748 4587 y Fr(R)808 4569 y Fm(d)808 4604 y(m)871 4568 y Fs(t)906 4583 y Fq(1)977 4568 y Fv(and)31 b Fs(t)k Fu(k)-72 b(!)1311 4587 y Fr(R)1371 4569 y Fm(d)1371 4604 y(n)1418 4568 y Fs(t)1453 4583 y Fq(2)1492 4568 y Fv(,)32 b(then)g(ther)-5 b(e)32 b(is)f(a)g(term)h Fs(t)2455 4583 y Fq(3)2526 4568 y Fv(such)g(that)g Fs(t)2976 4583 y Fq(1)3050 4568 y Fu(k)-72 b(!)3128 4587 y Fr(R)3188 4569 y Fm(d)3188 4604 y(n)3235 4568 y Fs(t)3270 4583 y Fq(3)3341 4568 y Fv(and)501 4689 y Fs(t)536 4704 y Fq(2)611 4689 y Fu(k)g(!)689 4708 y Fr(R)749 4689 y Fm(d)749 4724 y(m)811 4689 y Fs(t)846 4704 y Fq(3)886 4689 y Fv(.)86 b(Mor)-5 b(e)g(over,)52 b(the)c(r)-5 b(e)g(dexes)48 b(c)-5 b(ontr)g(acte)g(d)48 b(in)h Fs(t)2649 4704 y Fq(1)2723 4689 y Fu(k)-72 b(!)2801 4708 y Fr(R)2861 4689 y Fm(d)2861 4724 y(n)2908 4689 y Fs(t)2943 4704 y 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5232 y Fr(0)3126 5268 y Fw(+)12 b Fs(n)3272 5232 y Fr(0)3324 5268 y Fs(<)27 b(`)p Fw(.)257 5388 y(In)35 b(the)f(induction)f(step,)i(w)m(e)h(ha)m(v)m(e)f(to)e(pro) m(v)m(e)j(that)e(the)g(lemma)e(holds)h(for)h(all)e Fs(m)i Fw(and)1852 5637 y(8)p eop %%Page: 9 9 9 8 bop 584 714 a Fs(:)752 657 y Fr(R)812 634 y Fm(d)812 688 y(n)850 674 y Fk(0)p 927 757 4 95 v 946 757 V 1151 714 a Fs(:)630 959 y Fr(R)690 936 y Fm(d)690 990 y(m)744 976 y Fk(0)p 550 1061 95 4 v 550 1042 V 1197 959 a Fr(R)1257 936 y Fm(d)1257 990 y(m)1311 976 y Fk(0)p 1117 1061 V 1117 1042 V 584 1281 a Fs(:)752 1224 y Fr(R)812 1201 y Fm(d)812 1254 y(n)850 1240 y Fk(0)p 927 1324 4 95 v 946 1324 V 1151 1281 a Fs(:)p 645 711 473 4 v 1035 709 a Fh(-)p 596 1229 4 473 v 598 1229 a(?)p 1163 776 4 19 v 1163 813 V 1163 851 V 1163 889 V 1163 927 V 1163 965 V 1163 1002 V 1163 1040 V 1163 1078 V 1163 1116 V 1163 1154 V 1163 1191 V 1163 1229 V 1163 1229 4 48 v 484 w(?)p 645 1278 19 4 v 683 1278 V 720 1278 V 758 1278 V 796 1278 V 834 1278 V 872 1278 V 909 1278 V 947 1278 V 985 1278 V 1023 1278 V 1061 1278 V 1070 1278 48 4 v 1034 1276 a(-)1532 714 y Fs(:)1700 657 y Fr(R)1760 634 y Fm(d)1760 688 y(n)1798 674 y Fk(0)p 1875 757 4 95 v 1894 757 V 2099 714 a Fs(:)1578 959 y Fr(R)1638 936 y Fm(d)1638 990 y(m)1692 976 y Fk(0)p 1498 1061 95 4 v 1498 1042 V 1578 1226 a Fr(\003)2145 959 y(R)2205 936 y Fm(d)2205 990 y(m)2259 976 y Fk(0)p 2065 1061 V 2065 1042 V 2145 1226 a Fr(\003)1532 1281 y Fs(:)1700 1224 y Fr(R)1760 1201 y Fm(d)1760 1254 y(n)1798 1240 y Fk(0)p 1875 1324 4 95 v 1894 1324 V 2099 1281 a Fs(:)p 1593 711 473 4 v 1983 709 a Fh(-)p 1544 1229 4 473 v 1546 1229 a(?)p 2111 776 4 19 v 2111 813 V 2111 851 V 2111 889 V 2111 927 V 2111 965 V 2111 1002 V 2111 1040 V 2111 1078 V 2111 1116 V 2111 1154 V 2111 1191 V 2111 1229 V 2111 1229 4 48 v 484 w(?)p 1593 1278 19 4 v 1631 1278 V 1668 1278 V 1706 1278 V 1744 1278 V 1782 1278 V 1820 1278 V 1857 1278 V 1895 1278 V 1933 1278 V 1971 1278 V 2009 1278 V 2018 1278 48 4 v 1982 1276 a(-)2480 714 y Fs(:)2648 657 y Fr(R)2708 634 y Fm(d)2708 688 y(n)2746 674 y Fk(0)p 2823 757 4 95 v 2841 757 V 3047 714 a Fs(:)2967 678 y Fr(\003)2526 959 y(R)2586 936 y Fm(d)2586 990 y(m)2640 976 y Fk(0)p 2446 1061 95 4 v 2446 1042 V 2526 1226 a Fr(\003)3093 959 y(R)3153 936 y Fm(d)3153 990 y(m)3207 976 y Fk(0)p 3013 1061 V 3013 1042 V 3093 1226 a Fr(\003)2480 1281 y Fs(:)2648 1224 y Fr(R)2708 1201 y Fm(d)2708 1254 y(n)2746 1240 y Fk(0)p 2823 1324 4 95 v 2841 1324 V 2967 1245 a Fr(\003)3047 1281 y Fs(:)p 2541 711 473 4 v 2931 709 a Fh(-)p 2492 1229 4 473 v 2494 1229 a(?)p 3059 776 4 19 v 3059 813 V 3059 851 V 3059 889 V 3059 927 V 3059 965 V 3059 1002 V 3059 1040 V 3059 1078 V 3059 1116 V 3059 1154 V 3059 1191 V 3059 1229 V 3059 1229 4 48 v 483 w(?)p 2541 1278 19 4 v 2579 1278 V 2616 1278 V 2654 1278 V 2692 1278 V 2730 1278 V 2768 1278 V 2805 1278 V 2843 1278 V 2881 1278 V 2919 1278 V 2957 1278 V 2966 1278 48 4 v 2930 1276 a(-)799 1588 y Fw(Figure)31 b(1:)43 b(The)34 b(induction)d(h)m(yp)s(othesis)j(in)e(Lemma)f(3.7.)257 1873 y Fs(n)e Fw(with)f Fs(m)14 b Fw(+)g Fs(n)28 b Fw(=)f Fs(`)p Fw(.)42 b(Observ)m(e)31 b(that)d(the)h(inductiv)m(e)g(h)m(yp)s (othesis)g(implies)d(the)j(v)-5 b(alidit)m(y)257 1993 y(of)32 b(the)h(diagrams)e(in)h(Figure)g(1,)g(where)i Fs(m)1851 1957 y Fr(0)1897 1993 y Fw(+)22 b Fs(n)2053 1957 y Fr(0)2104 1993 y Fs(<)27 b(`)p Fw(.)257 2114 y(\(1\))42 b(Supp)s(ose)h Fs(s)h Fw(=)g Fs(l)1055 2129 y Fq(1)1094 2114 y Fs(\033)1149 2129 y Fq(1)1189 2114 y Fu(!)1289 2133 y Fr(R)1349 2114 y Fm(d)1349 2149 y(m)1412 2114 y Fs(r)1456 2129 y Fq(1)1495 2114 y Fs(\033)1550 2129 y Fq(1)1632 2114 y Fw(and)e Fs(s)i Fw(=)g Fs(l)2070 2129 y Fq(2)2109 2114 y Fs(\033)2164 2129 y Fq(2)2204 2114 y Fu(!)2304 2133 y Fr(R)2364 2114 y Fm(d)2364 2149 y(n)2411 2114 y Fs(r)2455 2129 y Fq(2)2494 2114 y Fs(\033)2549 2129 y Fq(2)2589 2114 y Fw(.)72 b(Since)42 b Fu(R)h Fw(is)e(orthog-)257 2234 y(onal,)58 b(the)c(rewrite)f(rules)g(coincide)g(and)g(will)e(b)s (e)j(denoted)g(b)m(y)h Fs(\032)63 b Fw(:)g Fs(l)i Fu(!)e Fs(r)j Fu(\()257 2354 y Fs(s)303 2369 y Fq(1)343 2354 y Fw(==)o Fs(t)529 2369 y Fq(1)569 2354 y Fs(;)17 b(:)g(:)g(:)33 b(;)17 b(s)851 2369 y Fp(k)893 2354 y Fw(==)p Fs(t)1080 2369 y Fp(k)1160 2354 y Fw(in)37 b(the)h(follo)m(wing.)55 b(Ob)m(viously)-8 b(,)39 b Fs(\033)2455 2369 y Fq(1)2531 2354 y Fw(=)d Fs(\033)2698 2369 y Fq(2)2775 2354 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\)],)39 b(i.e.,)g(the)257 2475 y(restrictions)k(of)f Fs(\033)949 2490 y Fq(1)1031 2475 y Fw(and)h Fs(\033)1286 2490 y Fq(2)1369 2475 y Fw(to)f Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))43 b(coincide.)73 b(So)43 b(if)e Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))45 b Fu(\022)g(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\),)46 b(then)257 2595 y Fs(r)301 2610 y Fq(1)341 2595 y Fs(\033)396 2610 y Fq(1)463 2595 y Fw(=)28 b Fs(r)611 2610 y Fq(2)650 2595 y Fs(\033)705 2610 y Fq(2)745 2595 y Fw(.)41 b(Supp)s(ose)24 b(otherwise)g(that)f Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))27 b Fu(6\022)h(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\).)41 b(W)-8 b(e)24 b(sho)m(w)g(b)m(y)g(induction)257 2715 y(on)33 b Fs(i)h Fw(that)f Fs(\033)727 2730 y Fq(1)795 2715 y Fw(=)c Fs(\033)955 2730 y Fq(2)1028 2715 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))22 b Fu([)1440 2641 y Ft(S)1523 2667 y Fp(i)1523 2744 y(j)t Fq(=1)1667 2715 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)1907 2730 y Fp(j)1943 2715 y Fw(\)].)46 b(It)33 b(then)g(follo)m(ws)f Fs(\033)2785 2730 y Fq(1)2854 2715 y Fw(=)c Fs(\033)3013 2730 y Fq(2)3086 2715 y Fw([)p Fu(E)9 b(V)f Fs(ar)s Fw(\()p Fs(\032)p Fw(\)])257 2836 y(and)42 b(hence)h Fs(r)780 2851 y Fq(1)819 2836 y Fs(\033)874 2851 y Fq(1)957 2836 y Fw(=)g Fs(r)1120 2851 y Fq(2)1159 2836 y Fs(\033)1214 2851 y Fq(2)1254 2836 y Fw(.)70 b(If)42 b Fs(i)h Fw(=)g(0,)g(then)f Fs(\033)2058 2851 y Fq(1)2141 2836 y Fw(=)h Fs(\033)2315 2851 y Fq(2)2396 2836 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\)].)71 b(Let)41 b Fs(i)i(>)g Fw(0.)70 b(Ac-)257 2956 y(cording)36 b(to)f(the)h(inductiv)m(e)h(h)m(yp)s(othesis,)h Fs(\033)1895 2971 y Fq(1)1968 2956 y Fw(=)33 b Fs(\033)2132 2971 y Fq(2)2208 2956 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))25 b Fu([)2624 2881 y Ft(S)2707 2908 y Fp(i)p Fr(\000)p Fq(1)2707 2985 y Fp(j)t Fq(=1)2851 2956 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)3091 2971 y Fp(j)3127 2956 y Fw(\)].)54 b(Since)257 3099 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(s)508 3114 y Fp(i)537 3099 y Fw(\))38 b Fu(\022)g(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))27 b Fu([)1122 3024 y Ft(S)1205 3050 y Fp(i)p Fr(\000)p Fq(1)1205 3128 y Fp(j)t Fq(=1)1348 3099 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)1588 3114 y Fp(j)1625 3099 y Fw(\),)40 b(it)e(is)g(su\016cien)m(t)i(to)e(sho)m(w)i Fs(\033)2782 3114 y Fq(1)2860 3099 y Fw(=)e Fs(\033)3029 3114 y Fq(2)3108 3099 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)3375 3114 y Fp(i)3403 3099 y Fw(\)].)257 3219 y(By)44 b(de\014nition)e(of)75 b Fu(k)-72 b(!)1097 3238 y Fr(R)1157 3219 y Fm(d)1157 3255 y(m)1262 3219 y Fw(and)75 b Fu(k)-72 b(!)1572 3238 y Fr(R)1632 3219 y Fm(d)1632 3255 y(n)1679 3219 y Fw(,)45 b(there)f(exist)f(ground)g(constructor)g(terms)g Fs(u)3456 3234 y Fq(1)257 3340 y Fw(and)c Fs(u)509 3355 y Fq(2)587 3340 y Fw(suc)m(h)h(that)f Fs(s)1077 3355 y Fp(i)1105 3340 y Fs(\033)1160 3355 y Fq(1)1200 3340 y Fu(!)1300 3303 y Fr(\003)1300 3377 y(R)1360 3354 y Fm(d)1360 3398 y(m)p Fk(\000)p Fl(1)1501 3340 y Fs(u)1557 3355 y Fq(1)1661 3303 y Fr(\003)1661 3377 y(R)1721 3354 y Fm(d)1721 3398 y(m)p Fk(\000)p Fl(1)1790 3340 y Fu( )32 b Fs(t)1957 3355 y Fp(i)1986 3340 y Fs(\033)2041 3355 y Fq(1)2119 3340 y Fw(and)39 b Fs(s)2361 3355 y Fp(i)2389 3340 y Fs(\033)2444 3355 y Fq(2)2484 3340 y Fu(!)2584 3303 y Fr(\003)2584 3377 y(R)2644 3354 y Fm(d)2644 3398 y(n)p Fk(\000)p Fl(1)2769 3340 y Fs(u)2825 3355 y Fq(2)2929 3303 y Fr(\003)2929 3377 y(R)2989 3354 y Fm(d)2989 3398 y(n)p Fk(\000)p Fl(1)3043 3340 y Fu( )32 b Fs(t)3210 3355 y Fp(i)3238 3340 y Fs(\033)3293 3355 y Fq(2)3333 3340 y Fw(.)62 b(It)257 3488 y(is)43 b(an)g(immediate)e(consequence)46 b(of)d Fs(s)1729 3503 y Fp(i)1757 3488 y Fs(\033)1812 3503 y Fq(1)1897 3488 y Fw(=)j Fs(s)2065 3503 y Fp(i)2093 3488 y Fs(\033)2148 3503 y Fq(2)2188 3488 y Fw(,)g Fs(s)2307 3503 y Fp(i)2335 3488 y Fs(\033)2390 3503 y Fq(1)2462 3488 y Fu(k)-72 b(!)2540 3452 y Fr(\003)2540 3525 y(R)2600 3502 y Fm(d)2600 3546 y(m)p Fk(\000)p Fl(1)2741 3488 y Fs(u)2797 3503 y Fq(1)2836 3488 y Fw(,)46 b Fs(s)2955 3503 y Fp(i)2983 3488 y Fs(\033)3038 3503 y Fq(2)3110 3488 y Fu(k)-72 b(!)3188 3452 y Fr(\003)3188 3525 y(R)3248 3502 y Fm(d)3248 3546 y(n)p Fk(\000)p Fl(1)3373 3488 y Fs(u)3429 3503 y Fq(2)3468 3488 y Fw(,)257 3631 y(and)48 b(the)g(inductiv)m(e)g(h)m(yp)s(othesis)g(on)g Fs(`)f Fw(that)g(the)h(t)m(w)m(o)g(ground)g(normal)e(forms)g Fs(u)3456 3646 y Fq(1)257 3751 y Fw(and)j Fs(u)519 3766 y Fq(2)606 3751 y Fw(coincide.)91 b(Hence)50 b Fs(t)1407 3766 y Fp(i)1435 3751 y Fs(\033)1490 3766 y Fq(1)1530 3751 y Fu(!)1630 3715 y Fr(\003)1630 3788 y(R)1690 3766 y Fm(d)1690 3810 y(m)p Fk(\000)p Fl(1)1831 3751 y Fs(u)1887 3766 y Fq(1)1991 3715 y Fr(\003)1991 3788 y(R)2051 3766 y Fm(d)2051 3810 y(n)p Fk(\000)p Fl(1)2104 3751 y Fu( )33 b Fs(t)2272 3766 y Fp(i)2300 3751 y Fs(\033)2355 3766 y Fq(2)2395 3751 y Fw(.)91 b(Th)m(us,)54 b(for)48 b(all)e(v)-5 b(ariables)257 3917 y Fs(x)66 b Fu(2)f(V)8 b Fs(ar)s Fw(\()p Fs(t)749 3932 y Fp(i)777 3917 y Fw(\))37 b Fu(n)g Fw(\()p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))37 b Fu([)1392 3842 y Ft(S)1475 3869 y Fp(i)p Fr(\000)p Fq(1)1475 3946 y Fp(j)t Fq(=1)1618 3917 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)1858 3932 y Fp(j)1895 3917 y Fw(\)\),)60 b(it)53 b(follo)m(ws)g(from)g(the)i (de\014nition)f(of)257 4038 y Fu(!)357 4001 y Fr(\003)357 4075 y(R)417 4052 y Fm(d)417 4096 y(m)p Fk(\000)p Fl(1)593 4038 y Fw(and)35 b Fu(!)885 4001 y Fr(\003)885 4075 y(R)945 4052 y Fm(d)945 4096 y(n)p Fk(\000)p Fl(1)1104 4038 y Fw(that)f Fs(x\033)1427 4053 y Fq(1)1502 4038 y Fw(and)h Fs(x\033)1804 4053 y Fq(2)1879 4038 y Fw(are)f(ground)h(constructor)g (terms)g(b)s(ecause)257 4186 y Fs(x)58 b Fu(2)g(E)9 b(V)f Fs(ar)s Fw(\()p Fs(\032)p Fw(\).)95 b(Therefore,)56 b(the)50 b(fact)g(that)g Fs(t)2121 4201 y Fp(i)2199 4186 y Fw(is)g(a)f (constructor)i(term)f(implies)257 4306 y Fs(x\033)367 4321 y Fq(1)435 4306 y Fw(=)28 b Fs(x\033)649 4321 y Fq(2)689 4306 y Fw(.)257 4427 y(\(2\))g(Since)g(parallel)d(reduction)j (con)m(tracts)g(pairwise)f(disjoin)m(t)g(redexes,)k(it)c(is)g (su\016cien)m(t)257 4547 y(to)34 b(pro)m(v)m(e)h(the)f(lemma)d(for)i (the)h(case)h(where)g(b)s(oth)e Fs(t)g Fu(k)-72 b(!)2313 4566 y Fr(R)2373 4547 y Fm(d)2373 4583 y(m)2435 4547 y Fs(t)2470 4562 y Fq(1)2544 4547 y Fw(and)33 b Fs(t)g Fu(k)-72 b(!)2880 4566 y Fr(R)2940 4547 y Fm(d)2940 4583 y(n)2986 4547 y Fs(t)3021 4562 y Fq(2)3095 4547 y Fw(consist)34 b(of)257 4667 y(a)40 b(single)e Fu(!)724 4687 y Fr(R)784 4668 y Fm(d)897 4667 y Fw(step.)66 b(In)40 b(other)g(w)m(ords,)i(w)m(e) f(ma)m(y)e(assume)i Fs(t)p Fu(!)2718 4687 y Fr(R)2778 4668 y Fm(d)2778 4703 y(m)2841 4667 y Fs(t)2876 4682 y Fq(1)2955 4667 y Fw(and)f Fs(t)p Fu(!)3287 4687 y Fr(R)3347 4668 y Fm(d)3347 4703 y(n)3393 4667 y Fs(t)3428 4682 y Fq(2)3468 4667 y Fw(.)257 4788 y(F)-8 b(urthermore,)29 b(b)s(ecause)h Fu(!)1303 4807 y Fr(R)1363 4788 y Fm(d)70 b Fw(is)28 b(deterministic,)g(the)h(only)f(in)m(teresting)h(case)g(is)f (that)257 4908 y(where)43 b Fs(t)e Fw(is)g(a)g(redex,)j(sa)m(y)e Fs(t)h Fw(=)f Fs(l)r(\033)t Fu(!)1684 4927 y Fr(R)1744 4908 y Fm(d)1744 4944 y(m)1807 4908 y Fs(r)s(\033)k Fw(=)c Fs(t)2108 4923 y Fq(1)2189 4908 y Fw(for)e(some)h(rule)g Fs(l)30 b Fu(!)d Fs(r)j Fu(\()e Fs(c)42 b Fu(2)h(R)p Fw(,)257 5029 y(con)m(taining)29 b(a)i(prop)s(er)f(subredex)j Fs(s)d Fw(whic)m(h)h(is)f(con)m(tracted)i(to)e Fs(s)2616 4992 y Fr(0)2670 5029 y Fw(in)f(the)i(step)h Fs(t)p Fu(!)3287 5048 y Fr(R)3347 5029 y Fm(d)3347 5064 y(n)3393 5029 y Fs(t)3428 5044 y Fq(2)3468 5029 y Fw(.)404 5149 y(Since)43 b Fu(R)g Fw(is)f(orthogonal,)i(there)g(is)e(a)h(v)-5 b(ariable)41 b Fs(x)46 b Fu(2)f(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))43 b(suc)m(h)i(that)d Fs(s)h Fw(is)f(a)257 5269 y(subterm)32 b(of)g Fs(x\033)t Fw(.)43 b(So)32 b Fs(x\033)g Fw(=)c Fs(C)7 b Fw([)p Fs(s)p Fw(])32 b(for)f(some)g(con)m (text)i Fs(C)7 b Fw([)32 b(].)43 b(Let)32 b Fs(q)k Fw(b)s(e)c(the)g(p)s (osition)e(in)1852 5637 y(9)p eop %%Page: 10 10 10 9 bop 257 573 a Fs(t)32 b Fw(suc)m(h)g(that)f Fs(t)p Fu(j)815 588 y Fp(q)881 573 y Fw(=)c Fs(s)p Fw(.)43 b(Consequen)m(tly) -8 b(,)34 b(for)c(ev)m(ery)j(descendan)m(t)h Fs(q)2674 537 y Fr(0)2728 573 y Fw(of)c Fs(q)35 b Fw(in)c Fs(t)3063 588 y Fq(1)3102 573 y Fw(,)h(w)m(e)g(ha)m(v)m(e)257 693 y Fs(t)292 708 y Fq(1)332 693 y Fu(j)360 708 y Fp(q)394 689 y Fk(0)448 693 y Fw(=)27 b Fs(s)p Fw(.)44 b(De\014ne)33 b Fs(t)1005 708 y Fq(3)1072 693 y Fw(=)28 b Fs(t)1211 708 y Fq(1)1250 693 y Fw([)p Fs(q)1324 657 y Fr(0)1375 693 y Fu( )g Fs(s)1549 657 y Fr(0)1604 693 y Fu(j)33 b Fs(q)1712 657 y Fr(0)1762 693 y Fu(2)28 b Fs(q)t Fu(n)p Fs(t)p Fu(!)2088 712 y Fr(R)2148 694 y Fm(d)2148 729 y(m)2211 693 y Fs(t)2246 708 y Fq(1)2286 693 y Fw(].)43 b(Clearly)-8 b(,)32 b Fs(t)2776 708 y Fq(1)2848 693 y Fu(k)-72 b(!)2926 712 y Fr(R)2986 694 y Fm(d)2986 729 y(n)3032 693 y Fs(t)3067 708 y Fq(3)3107 693 y Fw(.)404 814 y(It)50 b(remains)f(to)h(b)s(e)h(sho)m(wn)g(that)f Fs(t)1773 829 y Fq(2)1845 814 y Fu(k)-72 b(!)1923 833 y Fr(R)1983 814 y Fm(d)1983 849 y(m)2046 814 y Fs(t)2081 829 y Fq(3)2120 814 y Fw(.)97 b(T)-8 b(o)50 b(this)g(end,)55 b(let)50 b(us)h(consider)257 934 y Fs(t)28 b Fw(=)g Fs(l)r(\033)t Fu(!)614 953 y Fr(R)674 934 y Fm(d)674 970 y(m)737 934 y Fs(r)s(\033)j Fw(=)d Fs(t)1009 949 y Fq(1)1072 934 y Fw(again.)39 b(By)23 b(de\014nition)g(of)55 b Fu(k)-72 b(!)2147 953 y Fr(R)2207 934 y Fm(d)2207 970 y(m)2269 934 y Fw(,)26 b(there)e(exist)f(ground)g(construc-)257 1054 y(tor)31 b(terms)f Fs(u)738 1069 y Fp(i)797 1054 y Fw(suc)m(h)i(that)f Fs(s)1271 1069 y Fp(i)1299 1054 y Fs(\033)36 b Fu(k)-72 b(!)1468 1018 y Fr(\003)1468 1092 y(R)1528 1069 y Fm(d)1528 1113 y(m)p Fk(\000)p Fl(1)1669 1054 y Fs(u)1725 1069 y Fp(i)1784 1054 y Fw(and)31 b Fs(t)2007 1069 y Fp(i)2035 1054 y Fs(\033)37 b Fu(k)-72 b(!)2205 1018 y Fr(\003)2205 1092 y(R)2265 1069 y Fm(d)2265 1113 y(m)p Fk(\000)p Fl(1)2406 1054 y Fs(u)2462 1069 y Fp(i)2520 1054 y Fw(for)30 b(all)f Fs(s)2847 1069 y Fp(i)2875 1054 y Fw(==)p Fs(t)3062 1069 y Fp(i)3121 1054 y Fw(in)h Fs(c)p Fw(.)43 b(De-)257 1203 y(\014ne)30 b Fs(\033)497 1167 y Fr(0)550 1203 y Fw(b)m(y)g Fs(y)t(\033)g Fw(=)e Fs(y)t(\033)1034 1167 y Fr(0)1085 1203 y Fw(for)h(all)e Fs(y)k Fu(6)p Fw(=)c Fs(x)j Fw(and)f Fs(x\033)1930 1167 y Fr(0)1981 1203 y Fw(=)f Fs(C)7 b Fw([)p Fs(s)2235 1167 y Fr(0)2258 1203 y Fw(].)43 b(W)-8 b(e)29 b(sho)m(w)h Fs(s)2803 1218 y Fp(i)2832 1203 y Fs(\033)2891 1167 y Fr(0)2946 1203 y Fu(k)-72 b(!)3024 1167 y Fr(\003)3024 1240 y(R)3084 1217 y Fm(d)3084 1261 y(m)p Fk(\000)p Fl(1)3225 1203 y Fs(u)3281 1218 y Fp(i)3338 1203 y Fw(and)257 1351 y Fs(t)292 1366 y Fp(i)321 1351 y Fs(\033)380 1315 y Fr(0)436 1351 y Fu(k)g(!)514 1315 y Fr(\003)514 1388 y(R)574 1366 y Fm(d)574 1410 y(m)p Fk(\000)p Fl(1)715 1351 y Fs(u)771 1366 y Fp(i)798 1351 y Fw(.)57 b(It)37 b(then)h(follo)m(ws)e(that)h Fs(t)1795 1366 y Fq(2)1869 1351 y Fw(=)f Fs(t)p Fw([)p Fs(q)j Fu( )c Fs(s)2306 1315 y Fr(0)2329 1351 y Fw(])h(=)f Fs(l)r(\033)2593 1315 y Fr(0)2616 1351 y Fu(!)2716 1370 y Fr(R)2776 1351 y Fm(d)2776 1387 y(m)2839 1351 y Fs(r)s(\033)2945 1315 y Fr(0)3003 1351 y Fw(=)g Fs(t)3149 1366 y Fq(3)3189 1351 y Fw(.)57 b(Since)257 1500 y Fs(s)303 1515 y Fp(i)331 1500 y Fs(\033)37 b Fu(k)-72 b(!)501 1463 y Fr(\003)501 1533 y(R)561 1514 y Fm(d)561 1549 y(n)607 1500 y Fs(s)653 1515 y Fp(i)682 1500 y Fs(\033)741 1463 y Fr(0)764 1500 y Fw(,)40 b Fs(s)877 1515 y Fp(i)905 1500 y Fs(\033)d Fu(k)-72 b(!)1075 1463 y Fr(\003)1075 1537 y(R)1135 1514 y Fm(d)1135 1558 y(m)p Fk(\000)p Fl(1)1276 1500 y Fs(u)1332 1515 y Fp(i)1360 1500 y Fw(,)40 b(and)f Fs(u)1679 1515 y Fp(i)1746 1500 y Fw(is)f(a)h(normal)e(form,)i(it)f(follo)m(ws)f(from)h(the)h(in-)257 1648 y(ductiv)m(e)33 b(h)m(yp)s(othesis)g(that)e Fs(s)1334 1663 y Fp(i)1363 1648 y Fs(\033)1422 1612 y Fr(0)1477 1648 y Fu(k)-72 b(!)1555 1612 y Fr(\003)1555 1685 y(R)1615 1662 y Fm(d)1615 1706 y(m)p Fk(\000)p Fl(1)1756 1648 y Fs(u)1812 1663 y Fp(i)1840 1648 y Fw(.)43 b(Analogously)-8 b(,)31 b(w)m(e)i(obtain)d Fs(t)2962 1663 y Fp(i)2991 1648 y Fs(\033)3050 1612 y Fr(0)3106 1648 y Fu(k)-72 b(!)3184 1612 y Fr(\003)3184 1685 y(R)3244 1662 y Fm(d)3244 1706 y(m)p Fk(\000)p Fl(1)3384 1648 y Fs(u)3440 1663 y Fp(i)3468 1648 y Fw(.)257 1789 y Fj(\003)257 2007 y Fo(Corollary)36 b(3.8)49 b Fu(!)1047 2026 y Fr(R)1107 2007 y Fm(d)81 b Fv(is)38 b(level-c)-5 b(on\015uent)37 b(\(i.e.,)g(for)h(every)g Fs(n)33 b Fu(2)h Fi(N)9 b Fv(,)44 b Fu(!)3064 2026 y Fr(R)3124 2007 y Fm(d)3124 2043 y(n)3208 2007 y Fv(is)38 b(c)-5 b(on-)257 2127 y(\015uent\).)257 2346 y(Pr)g(o)g(of)67 b Fw(Immediate)32 b(consequence)j(of)d(Lemma)f (3.7.)1220 b Fj(\003)257 2564 y Fo(Theorem)37 b(3.9)49 b Fv(Every)35 b(almost)g(functional)f(CTRS)g Fu(R)i Fv(is)e(level-c)-5 b(on\015uent.)257 2782 y(Pr)g(o)g(of)61 b Fw(It)29 b(follo)m(ws)e(from) h Fu(!)1290 2802 y Fr(R)1350 2783 y Fm(d)1350 2818 y(n)1424 2782 y Fu(\022)g(!)1629 2797 y Fr(R)1689 2805 y Fm(n)1765 2782 y Fw(and)h(Prop)s(osition)e(3.10)h(that)h Fu(!)2982 2797 y Fr(R)3042 2805 y Fm(n)3117 2782 y Fw(is)g(a)f(com-)257 2903 y(patible)36 b(re\014nemen)m(t)i(of)f Fu(!)1287 2922 y Fr(R)1347 2903 y Fm(d)1347 2939 y(n)1393 2903 y Fw(.)57 b(Hence,)40 b(b)m(y)e(the)f(aforemen)m(tioned)g(result)g(of)f (Staples)257 3023 y([18],)d Fu(!)569 3038 y Fr(R)629 3046 y Fm(n)708 3023 y Fw(is)f(con\015uen)m(t)i(if)d(and)i(only)f(if)f Fu(!)1908 3042 y Fr(R)1968 3023 y Fm(d)1968 3059 y(n)2047 3023 y Fw(is)i(con\015uen)m(t.)859 b Fj(\003)404 3238 y Fw(As)42 b(a)g(matter)f(of)g(fact,)j(b)m(y)f(carefully)e(c)m(hec)m (king)i(the)f(pro)s(ofs)g(in)f([20],)j(one)e(\014nds)257 3359 y(that)31 b(Theorem)h(3.9)f(can)g(b)s(e)h(pro)m(v)m(en)h(in)d(the) i(same)f(manner.)43 b(The)32 b(pro)s(of)e(tec)m(hniques,)257 3479 y(ho)m(w)m(ev)m(er,)37 b(are)d(totally)f(di\013eren)m(t.)48 b(Suzuki)34 b(et)h(al.)e([20)o(])h(came)g(to)g(the)g(result)g(b)m(y)h (using)257 3599 y(an)e(extended)h(parallel)c(rewriting)i(relation.)257 3818 y Fo(Prop)s(osition)k(3.10)49 b Fv(If)35 b Fs(s)p Fu(!)1360 3781 y Fr(\003)1360 3843 y(R)1420 3851 y Fm(n)1501 3818 y Fs(t)p Fv(,)g(then)g(ther)-5 b(e)36 b(is)f(a)g(term)g Fs(u)g Fv(such)g(that)h Fs(s)p Fu(!)3144 3781 y Fr(\003)3144 3851 y(R)3204 3832 y Fm(d)3204 3868 y(n)3250 3818 y Fs(u)f Fv(and)257 3938 y Fs(t)p Fu(!)392 3902 y Fr(\003)392 3971 y(R)452 3952 y Fm(d)452 3988 y(n)499 3938 y Fs(u)p Fv(.)257 4156 y(Pr)-5 b(o)g(of)72 b Fw(W)-8 b(e)35 b(pro)s(ceed)h(b)m (y)g(induction)e(on)h(the)g(depth)h Fs(n)f Fw(of)g Fs(s)p Fu(!)2603 4120 y Fr(\003)2603 4181 y(R)2699 4156 y Fs(t)p Fw(.)51 b(The)36 b(prop)s(osition)257 4277 y(holds)h(v)-5 b(acuously)38 b(for)f Fs(n)f Fw(=)f(0.)57 b(So)37 b(let)g Fs(n)f(>)f Fw(0.)58 b(W)-8 b(e)37 b(further)h(pro)s(ceed)g(b)m(y)g (induction)257 4397 y(on)j(the)h(length)e Fs(`)h Fw(of)f(the)i (reduction)f(sequence)j Fs(s)p Fu(!)2263 4361 y Fr(\003)2263 4422 y(R)2323 4430 y Fm(n)2401 4397 y Fs(t)p Fw(.)69 b(Again,)42 b(the)g(case)g Fs(`)g Fw(=)f(0)257 4517 y(holds)i(v)-5 b(acuously)d(.)74 b(Supp)s(ose)43 b(the)g(claim)e(is)h(true)h(for)f Fs(`)p Fw(.)73 b(In)43 b(order)g(to)f(sho)m(w)i(it)e(for)257 4638 y Fs(`)20 b Fw(+)g(1,)32 b(w)m(e)g(consider)g Fs(s)c Fw(=)f Fs(C)7 b Fw([)p Fs(l)r(\033)t Fw(])p Fu(!)1541 4653 y Fr(R)1601 4661 y Fm(n)1648 4638 y Fs(C)g Fw([)p Fs(r)s(\033)t Fw(])28 b(=)f Fs(t)2051 4602 y Fr(0)2075 4638 y Fu(!)2175 4602 y Fp(`)2175 4663 y Fr(R)2235 4671 y Fm(n)2314 4638 y Fs(t)p Fw(,)32 b(where)h Fs(s)p Fu(!)2835 4653 y Fr(R)2895 4661 y Fm(n)2941 4638 y Fs(t)2976 4602 y Fr(0)3031 4638 y Fw(b)m(y)g(the)f(rule)257 4758 y Fs(\032)c Fw(:)g Fs(l)i Fu(!)d Fs(r)k Fu(\()c Fs(s)824 4773 y Fq(1)863 4758 y Fw(==)p Fs(t)1050 4773 y Fq(1)1090 4758 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)1371 4773 y Fp(k)1414 4758 y Fw(==)o Fs(t)1600 4773 y Fp(k)1643 4758 y Fw(.)41 b(It)25 b(follo)m(ws)e(from)h(the)h(inductiv)m(e)g(h)m(yp)s(othesis)h(on)257 4879 y Fs(`)j Fw(that)f(there)i(is)e(a)h(term)f Fs(u)1237 4842 y Fr(0)1288 4879 y Fw(suc)m(h)i(that)f Fs(t)1747 4842 y Fr(0)1771 4879 y Fu(!)1871 4842 y Fr(\003)1871 4912 y(R)1931 4893 y Fm(d)1931 4928 y(n)1977 4879 y Fs(u)2033 4842 y Fr(0)2085 4879 y Fw(and)f Fs(t)p Fu(!)2405 4842 y Fr(\003)2405 4912 y(R)2465 4893 y Fm(d)2465 4928 y(n)2512 4879 y Fs(u)2568 4842 y Fr(0)2591 4879 y Fw(.)42 b(Since)29 b Fs(s)p Fu(!)3057 4894 y Fr(R)3117 4902 y Fm(n)3163 4879 y Fs(t)3198 4842 y Fr(0)3222 4879 y Fw(,)g(there)257 4999 y(are)40 b(ground)h(constructor)f(terms)g Fs(u)1623 5014 y Fp(i)1691 4999 y Fw(suc)m(h)i(that)e Fs(s)2184 5014 y Fp(i)2212 4999 y Fs(\033)t Fu(!)2371 4963 y Fr(\003)2371 5024 y(R)2431 5033 y Fm(n)p Fk(\000)p Fl(1)2556 4999 y Fs(u)2612 5014 y Fp(i)2672 4963 y Fr(\003)2672 5024 y(R)2732 5033 y Fm(n)p Fk(\000)p Fl(1)2852 4999 y Fu( )32 b Fs(t)3019 5014 y Fp(i)3047 4999 y Fs(\033)t Fw(.)66 b(By)41 b(the)257 5119 y(inductiv)m(e)30 b(h)m(yp)s(othesis)g(on)f Fs(n)g Fw(and)g(the)g(fact)g(that)g Fs(u)2176 5134 y Fp(i)2233 5119 y Fw(is)f(a)h(normal)e(form,)i(w)m(e)h(conclude)257 5240 y Fs(s)303 5255 y Fp(i)331 5240 y Fs(\033)t Fu(!)490 5204 y Fr(\003)490 5277 y(R)550 5254 y Fm(d)550 5298 y(n)p Fk(\000)p Fl(1)675 5240 y Fs(u)731 5255 y Fp(i)824 5204 y Fr(\003)824 5277 y(R)884 5254 y Fm(d)884 5298 y(n)p Fk(\000)p Fl(1)937 5240 y Fu( )j Fs(t)1105 5255 y Fp(i)1133 5240 y Fs(\033)t Fw(.)47 b(No)m(w)34 b(if)e Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))29 b Fu(\022)h(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\),)34 b(then)g Fs(s)p Fu(!)2709 5259 y Fr(R)2769 5240 y Fm(d)2769 5276 y(n)2816 5240 y Fs(t)2851 5204 y Fr(0)2908 5240 y Fw(and)g(the)g(claim)257 5388 y(follo)m(ws.)41 b(Supp)s(ose)29 b(otherwise)f(that)f Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))28 b Fu(6\022)g(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))28 b(and)f(let)g Fs(x)h Fu(2)g(E)9 b(V)f Fs(ar)s Fw(\()p Fs(\032)p Fw(\).)42 b(Then)1828 5637 y(10)p eop %%Page: 11 11 11 10 bop 257 573 a Fs(x)39 b Fu(2)f(V)8 b Fs(ar)s Fw(\()p Fs(t)695 588 y Fp(j)732 573 y Fw(\))39 b(for)f(some)g Fs(s)1260 588 y Fp(j)1297 573 y Fw(==)o Fs(t)1483 588 y Fp(j)1520 573 y Fw(.)62 b(Since)38 b Fs(t)1904 588 y Fp(j)1941 573 y Fs(\033)t Fu(!)2100 537 y Fr(\003)2100 610 y(R)2160 587 y Fm(d)2160 631 y(n)p Fk(\000)p Fl(1)2285 573 y Fs(u)2341 588 y Fp(j)2377 573 y Fw(,)i Fs(t)2479 588 y Fp(j)2555 573 y Fw(is)e(a)g(constructor)i(term,)257 716 y(and)j Fs(u)513 731 y Fp(j)591 716 y Fw(is)e(a)h(ground)g (constructor)h(term,)h(it)d(follo)m(ws)g(that)h Fs(x\033)t Fu(!)2798 680 y Fr(\003)2798 753 y(R)2858 730 y Fm(d)2858 774 y(n)p Fk(\000)p Fl(1)2983 716 y Fs(u)3039 731 y Fp(x)3125 716 y Fw(for)f(some)257 859 y(ground)30 b(constructor)g(subterm)g Fs(u)1530 874 y Fp(x)1603 859 y Fw(of)f Fs(u)1767 874 y Fp(j)1804 859 y Fw(.)42 b(Note)30 b(that)f Fs(u)2370 874 y Fp(x)2443 859 y Fw(is)g(unique)h(b)s(ecause)h Fu(!)3310 882 y Fr(R)3370 859 y Fm(d)3370 903 y(n)p Fk(\000)p Fl(1)257 993 y Fw(is)d(con\015uen)m(t)i(\()p Fu(!)905 1012 y Fr(R)965 993 y Fm(d)69 b Fw(is)28 b(lev)m(el-con\015uen)m(t)h(b)m(y)g(Corollary) e(3.8\).)41 b(De\014ne)29 b Fs(\033)2944 957 y Fr(0)2996 993 y Fw(b)m(y)g Fs(x\033)3241 957 y Fr(0)3292 993 y Fw(=)f Fs(u)3452 1008 y Fp(x)257 1113 y Fw(for)38 b(ev)m(ery)h Fs(x)e Fu(2)g(E)9 b(V)e Fs(ar)s Fw(\()p Fs(\032)p Fw(\))38 b(and)g Fs(y)t(\033)1567 1077 y Fr(0)1626 1113 y Fw(=)e Fs(y)t(\033)41 b Fw(otherwise.)59 b(Observ)m(e)40 b(that)d Fs(z)t(\033)t Fu(!)3177 1077 y Fr(\003)3177 1150 y(R)3237 1128 y Fm(d)3237 1172 y(n)p Fk(\000)p Fl(1)3363 1113 y Fs(z)t(\033)3471 1077 y Fr(0)257 1262 y Fw(for)47 b(ev)m(ery)h(v)-5 b(ariable)45 b Fs(z)57 b Fu(2)52 b(D)s Fw(\()p Fs(\033)t Fw(\).)86 b(Let)47 b Fs(s)1855 1225 y Fr(0)1930 1262 y Fw(=)52 b Fs(C)7 b Fw([)p Fs(r)s(\033)2268 1225 y Fr(0)2291 1262 y Fw(].)86 b(According)47 b(to)f(the)h(ab)s(o)m(v)m(e,)257 1382 y Fs(t)292 1346 y Fr(0)316 1382 y Fu(!)416 1346 y Fr(\003)416 1419 y(R)476 1396 y Fm(d)476 1440 y(n)p Fk(\000)p Fl(1)601 1382 y Fs(s)647 1346 y Fr(0)670 1382 y Fw(.)78 b(Observ)m(e)46 b(that)d(also)g Fs(s)p Fu(!)1736 1401 y Fr(R)1796 1382 y Fm(d)1796 1418 y(n)1843 1382 y Fs(s)1889 1346 y Fr(0)1956 1382 y Fw(b)s(ecause)i Fs(s)2374 1397 y Fp(j)2411 1382 y Fs(\033)2470 1346 y Fr(0)2493 1382 y Fu(!)2593 1346 y Fr(\003)2593 1419 y(R)2653 1396 y Fm(d)2653 1440 y(n)p Fk(\000)p Fl(1)2778 1382 y Fs(u)2834 1397 y Fp(j)2935 1346 y Fr(\003)2935 1419 y(R)2995 1396 y Fm(d)2995 1440 y(n)p Fk(\000)p Fl(1)3049 1382 y Fu( )32 b Fs(t)3216 1397 y Fp(j)3252 1382 y Fs(\033)3311 1346 y Fr(0)3379 1382 y Fw(for)257 1530 y(ev)m(ery)45 b Fs(s)571 1545 y Fp(j)608 1530 y Fw(==)p Fs(t)795 1545 y Fp(j)874 1530 y Fw(in)e Fs(c)g Fw(\(it)f(is)g(a)h(consequence)j(of)d Fs(s)2159 1545 y Fp(j)2195 1530 y Fs(\033)t Fu(!)2354 1494 y Fr(\003)2354 1568 y(R)2414 1545 y Fm(d)2414 1589 y(n)p Fk(\000)p Fl(1)2539 1530 y Fs(u)2595 1545 y Fp(j)2631 1530 y Fw(,)j Fs(s)2750 1545 y Fp(j)2786 1530 y Fs(\033)t Fu(!)2945 1494 y Fr(\003)2945 1568 y(R)3005 1545 y Fm(d)3005 1589 y(n)p Fk(\000)p Fl(1)3130 1530 y Fs(s)3176 1545 y Fp(j)3213 1530 y Fs(\033)3272 1494 y Fr(0)3338 1530 y Fw(and)257 1679 y(con\015uence)51 b(of)d Fu(!)972 1702 y Fr(R)1032 1679 y Fm(d)1032 1723 y(n)p Fk(\000)p Fl(1)1206 1679 y Fw(that)g Fs(s)1479 1694 y Fp(j)1516 1679 y Fs(\033)1575 1643 y Fr(0)1598 1679 y Fu(!)1698 1643 y Fr(\003)1698 1716 y(R)1758 1693 y Fm(d)1758 1737 y(n)p Fk(\000)p Fl(1)1883 1679 y Fs(u)1939 1694 y Fp(j)1975 1679 y Fw(\).)92 b(It)49 b(no)m(w)g(follo)m(ws)f(from)f(con\015uence)257 1825 y(of)42 b Fu(!)478 1845 y Fr(R)538 1826 y Fm(d)538 1861 y(n)627 1825 y Fw(in)f(conjunction)h(with)g Fs(t)1555 1789 y Fr(0)1578 1825 y Fu(!)1678 1789 y Fr(\003)1678 1863 y(R)1738 1840 y Fm(d)1738 1884 y(n)p Fk(\000)p Fl(1)1863 1825 y Fs(s)1909 1789 y Fr(0)1974 1825 y Fw(and)h Fs(t)2209 1789 y Fr(0)2232 1825 y Fu(!)2332 1789 y Fr(\003)2332 1859 y(R)2392 1840 y Fm(d)2392 1875 y(n)2439 1825 y Fs(u)2495 1789 y Fr(0)2560 1825 y Fw(that)f Fs(s)2827 1789 y Fr(0)2892 1825 y Fw(and)g Fs(u)3147 1789 y Fr(0)3212 1825 y Fw(ha)m(v)m(e)h(a)257 1968 y(common)e(reduct)i Fs(u)f Fw(w.r.t.)73 b Fu(!)1468 1987 y Fr(R)1528 1969 y Fm(d)1528 2004 y(n)1574 1968 y Fw(.)f(Clearly)-8 b(,)44 b Fs(u)e Fw(is)f(a)h(common)f(reduct)i(of)f Fs(s)g Fw(and)g Fs(t)257 2089 y Fw(w.r.t.)i Fu(!)628 2108 y Fr(R)688 2089 y Fm(d)688 2124 y(n)767 2089 y Fw(as)33 b(w)m(ell.)2338 b Fj(\003)404 2309 y Fw(Since)34 b(term)f(rewriting)g (is)g(mainly)f(concerned)k(with)d(computing)g(normal)f(forms,)257 2429 y(the)h(next)h(lemma)c(is)i(of)g(in)m(terest.)257 2657 y Fo(Lemma)37 b(3.11)50 b Fv(F)-7 b(or)43 b(every)h Fs(n)h Fu(2)g Fi(N)9 b Fv(,)53 b(the)44 b(sets)g(of)g(normal)f(forms)h Fs(N)10 b(F)k Fw(\()p Fu(!)3152 2672 y Fr(R)3212 2680 y Fm(n)3259 2657 y Fw(\))44 b Fv(and)257 2778 y Fs(N)10 b(F)k Fw(\()p Fu(!)560 2797 y Fr(R)620 2778 y Fm(d)620 2814 y(n)667 2778 y Fw(\))35 b Fv(c)-5 b(oincide.)257 3006 y(Pr)g(o)g(of)71 b Fw(Ob)m(viously)-8 b(,)35 b Fs(N)10 b(F)k Fw(\()p Fu(!)1338 3021 y Fr(R)1398 3029 y Fm(n)1445 3006 y Fw(\))30 b Fu(\022)i Fs(N)10 b(F)k Fw(\()p Fu(!)1925 3025 y Fr(R)1985 3006 y Fm(d)1985 3042 y(n)2031 3006 y Fw(\))35 b(b)s(ecause)h Fu(!)2567 3025 y Fr(R)2627 3006 y Fm(d)2627 3042 y(n)2704 3006 y Fu(\022)31 b(!)2912 3021 y Fr(R)2972 3029 y Fm(n)3019 3006 y Fw(.)49 b(W)-8 b(e)35 b(pro)m(v)m(e)257 3126 y Fs(N)10 b(F)k Fw(\()p Fu(!)560 3146 y Fr(R)620 3127 y Fm(d)620 3162 y(n)667 3126 y Fw(\))47 b Fu(\022)h Fs(N)10 b(F)k Fw(\()p Fu(!)1180 3141 y Fr(R)1240 3149 y Fm(n)1287 3126 y Fw(\))44 b(indirectly)-8 b(.)77 b(T)-8 b(o)44 b(this)g(end,)k(supp)s(ose)d(there)g(is)f(a)g (term)257 3247 y Fs(s)51 b Fu(2)f Fs(N)10 b(F)k Fw(\()p Fu(!)773 3266 y Fr(R)833 3247 y Fm(d)833 3283 y(n)880 3247 y Fw(\))46 b(but)g Fs(s)k Fu(62)h Fs(N)10 b(F)k Fw(\()p Fu(!)1672 3262 y Fr(R)1732 3270 y Fm(n)1779 3247 y Fw(\).)83 b(Since)46 b Fs(s)g Fw(is)g(not)f(a)h(normal)e(form)h (w.r.t.)257 3367 y Fu(!)357 3382 y Fr(R)417 3390 y Fm(n)464 3367 y Fw(,)50 b(there)e(is)e(a)h(rule)f Fs(\032)52 b Fw(:)g Fs(l)i Fu(!)e Fs(r)j Fu(\()c Fs(s)1934 3382 y Fq(1)1973 3367 y Fw(==)p Fs(t)2160 3382 y Fq(1)2200 3367 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)2481 3382 y Fp(k)2524 3367 y Fw(==)o Fs(t)2710 3382 y Fp(k)2805 3367 y Fu(2)53 b(R)p Fw(,)d(a)d(con)m(text)257 3488 y Fs(C)7 b Fw([)48 b(])f(and)g(a)g(substitution)g Fs(\033)k Fw(suc)m(h)e(that)e Fs(s)52 b Fw(=)h Fs(C)7 b Fw([)p Fs(l)r(\033)t Fw(])p Fu(!)2456 3503 y Fr(R)2516 3511 y Fm(n)2563 3488 y Fs(C)g Fw([)p Fs(r)s(\033)t Fw(].)87 b(In)48 b(particular,)257 3608 y(for)j(ev)m(ery)i Fs(s)747 3623 y Fp(j)783 3608 y Fw(==)p Fs(t)970 3623 y Fp(j)1058 3608 y Fw(in)d Fs(c)p Fw(,)56 b(there)c(is)f(a)g(ground)g(constructor)h(term)f Fs(u)2991 3623 y Fp(j)3078 3608 y Fw(suc)m(h)h(that)257 3728 y Fs(s)303 3743 y Fp(j)340 3728 y Fs(\033)t Fu(!)499 3692 y Fr(\003)499 3753 y(R)559 3762 y Fm(n)p Fk(\000)p Fl(1)684 3728 y Fs(u)740 3743 y Fp(j)808 3692 y Fr(\003)808 3753 y(R)868 3762 y Fm(n)p Fk(\000)p Fl(1)988 3728 y Fu( )32 b Fs(t)1155 3743 y Fp(j)1192 3728 y Fs(\033)t Fw(.)61 b(It)39 b(follo)m(ws)e(as)i(in)e(the)i(pro)s(of)f(of)g(Prop)s (osition)f(3.10)g(that)257 3849 y Fs(s)303 3864 y Fp(j)340 3849 y Fs(\033)399 3813 y Fr(0)422 3849 y Fu(!)522 3813 y Fr(\003)522 3886 y(R)582 3863 y Fm(d)582 3907 y(n)p Fk(\000)p Fl(1)707 3849 y Fs(u)763 3864 y Fp(j)864 3813 y Fr(\003)864 3886 y(R)924 3863 y Fm(d)924 3907 y(n)p Fk(\000)p Fl(1)977 3849 y Fu( )c Fs(t)1145 3864 y Fp(j)1181 3849 y Fs(\033)1240 3813 y Fr(0)1264 3849 y Fw(.)79 b(Hence)46 b Fs(s)i Fw(=)g Fs(C)7 b Fw([)p Fs(l)r(\033)t Fw(])49 b(=)f Fs(C)7 b Fw([)p Fs(l)r(\033)2478 3813 y Fr(0)2501 3849 y Fw(])p Fu(!)2628 3868 y Fr(R)2688 3849 y Fm(d)2688 3884 y(n)2735 3849 y Fs(C)g Fw([)p Fs(r)s(\033)2945 3813 y Fr(0)2968 3849 y Fw(].)80 b(This)44 b(is)g(a)257 3997 y(con)m(tradiction)32 b(to)g Fs(s)c Fu(2)g Fs(N)10 b(F)k Fw(\()p Fu(!)1441 4016 y Fr(R)1501 3997 y Fm(d)1501 4033 y(n)1547 3997 y Fw(\).)1806 b Fj(\003)404 4217 y Fw(W)-8 b(e)33 b(w)m(ould)h(lik)m(e)e(to)h(p)s(oin)m(t)g(out)g(that)g(all)e(of) i(the)h(preceding)f(results)h(remain)e(v)-5 b(alid)257 4337 y(if)32 b(w)m(e)h(replace)g(orthogonalit)m(y)e(with)h(almost)f (orthogonalit)m(y)-8 b(.)257 4670 y Fx(4)161 b(Conditional)55 b(T)-13 b(erm)53 b(Graph)g(Rewriting)257 4889 y Fw(In)23 b(this)f(section,)j(w)m(e)e(use)h(the)e(term)g(based)i(approac)m(h)e (of)g([12])g(to)g(term)g(graph)g(rewriting)257 5010 y(rather)28 b(than)g(those)h(of)f([4)o(])g(or)g([17].)42 b(In)28 b(so)g(doing,)g(it)f(is)g(p)s(ossible)h(to)f(completely)g(argue)257 5130 y(within)j(the)h(framew)m(ork)g(of)f(term)h(rewriting)e(and)i(to)f (a)m(v)m(oid)h(concepts)h(from)e(di\013eren)m(t)257 5250 y(\014elds;)37 b(see)e(also)f([16].)50 b(W)-8 b(e)35 b(\014rst)g(recapitulate)f(some)h(basic)f(notions.)50 b(Most)35 b(of)f(them)257 5371 y(stem)f(from)e([12].)1828 5637 y(11)p eop %%Page: 12 12 12 11 bop 404 573 a Fw(Let)33 b Fu(F)43 b Fw(b)s(e)33 b(a)g(signature)g(and)g Fu(V)41 b Fw(b)s(e)34 b(a)f(set)h(of)e(v)-5 b(ariables.)44 b(Let)34 b Fs(M)44 b Fw(b)s(e)33 b(a)g(coun)m(tably)257 693 y(in\014nite)i(set)h(of)f(ob)5 b(jects)36 b(called)f Fv(marks)f Fw(\(w)m(e)j(will)c(use)j(natural)e(n)m(um)m(b)s(ers)j(as)e (marks\).)257 814 y(Let)h Fu(F)517 772 y Fr(\003)589 814 y Fw(=)c Fu(f)p Fs(f)806 777 y Fp(\026)888 814 y Fu(j)j Fs(f)43 b Fu(2)34 b(F)9 b Fs(;)17 b(\026)32 b Fu(2)h Fs(M)10 b Fu(g)36 b Fw(b)s(e)g(the)g(set)g(of)f Fv(marke)-5 b(d)37 b(function)g(symb)-5 b(ols)p Fw(.)52 b(F)-8 b(or)257 934 y(all)37 b Fs(f)458 898 y Fp(\026)542 934 y Fu(2)h(F)727 892 y Fr(\003)767 934 y Fw(,)i(the)e(arit)m(y)g(of)g Fs(f)1422 898 y Fp(\026)1507 934 y Fw(coincides)g(with)g(that)g(of)g Fs(f)11 b Fw(.)61 b(Moreo)m(v)m(er,)41 b(w)m(e)f(de\014ne)257 1054 y Fs(sy)t(mbol)r Fw(\()p Fs(f)656 1018 y Fp(\026)703 1054 y Fw(\))29 b(=)g Fs(f)44 b Fw(and)34 b Fs(mar)s(k)s Fw(\()p Fs(f)1492 1018 y Fp(\026)1538 1054 y Fw(\))c(=)f Fs(\026)p Fw(.)46 b(Analogously)-8 b(,)32 b(let)h Fu(V)2627 1013 y Fr(\003)2696 1054 y Fw(=)c Fu(f)p Fs(x)2906 1018 y Fp(\026)2986 1054 y Fu(j)34 b Fs(x)29 b Fu(2)h(V)8 b Fs(;)17 b(\026)29 b Fu(2)257 1175 y Fs(M)10 b Fu(g)44 b Fw(b)s(e)f(the)h(set)f(of)g Fv(marke)-5 b(d)43 b(variables)p Fw(,)i Fs(sy)t(mbol)r Fw(\()p Fs(x)2248 1139 y Fp(\026)2295 1175 y Fw(\))g(=)g Fs(x)p Fw(,)h(and)e Fs(mar)s(k)s Fw(\()p Fs(x)3158 1139 y Fp(\026)3205 1175 y Fw(\))h(=)g Fs(\026)p Fw(.)257 1295 y(The)f(set)f(of)e Fv(marke)-5 b(d)43 b(terms)f Fw(o)m(v)m(er)i Fu(F)1679 1253 y Fr(\003)1761 1295 y Fw(and)e Fu(V)2029 1253 y Fr(\003)2111 1295 y Fw(is)g(de\014ned)h(in)f (the)h(usual)f(w)m(a)m(y)h(and)257 1416 y(is)36 b(denoted)h(b)m(y)g Fu(T)25 b Fw(\()p Fu(F)1069 1374 y Fr(\003)1108 1416 y Fs(;)17 b Fu(V)1221 1374 y Fr(\003)1261 1416 y Fw(\).)53 b(The)37 b(set)g(of)f(all)e(marks)h(app)s(earing)g(in)h(a)f(mark)m(ed)i (term)257 1536 y Fs(t)292 1500 y Fr(\003)361 1536 y Fu(2)30 b(T)25 b Fw(\()p Fu(F)656 1494 y Fr(\003)695 1536 y Fs(;)17 b Fu(V)808 1494 y Fr(\003)848 1536 y Fw(\))33 b(is)g(denoted)h(b)m(y)h Fs(mar)s(k)s(s)p Fw(\()p Fs(t)1880 1500 y Fr(\003)1920 1536 y Fw(\).)46 b(The)34 b(set)g Fu(T)2439 1551 y Fp(w)2496 1536 y Fw(\()p Fu(F)2616 1500 y Fr(\003)2655 1536 y Fs(;)17 b Fu(V)2768 1500 y Fr(\003)2808 1536 y Fw(\))33 b(of)g Fv(wel)5 b(l-marke)-5 b(d)257 1656 y(terms)36 b Fw(o)m(v)m(er)h Fu(F)824 1615 y Fr(\003)899 1656 y Fw(and)f Fu(V)1162 1615 y Fr(\003)1237 1656 y Fw(is)f(the)h(subset)h(of)f Fu(T)25 b Fw(\()p Fu(F)2125 1620 y Fr(\003)2164 1656 y Fs(;)17 b Fu(V)2277 1620 y Fr(\003)2317 1656 y Fw(\))35 b(suc)m(h)i(that)f Fs(t)2863 1620 y Fr(\003)2936 1656 y Fu(2)d(T)3089 1671 y Fp(w)3146 1656 y Fw(\()p Fu(F)3266 1620 y Fr(\003)3305 1656 y Fs(;)17 b Fu(V)3418 1620 y Fr(\003)3457 1656 y Fw(\))257 1777 y(if)46 b(and)h(only)f(if,)k(for)c (ev)m(ery)i(pair)e(\()p Fs(t)1650 1741 y Fr(\003)1650 1801 y Fq(1)1690 1777 y Fs(;)17 b(t)1769 1741 y Fr(\003)1769 1801 y Fq(2)1808 1777 y Fw(\))47 b(of)f(subterms)i(of)e Fs(t)2611 1741 y Fr(\003)2651 1777 y Fw(,)k Fs(mar)s(k)s Fw(\()p Fs(r)s(oot)p Fw(\()p Fs(t)3252 1741 y Fr(\003)3252 1801 y Fq(1)3292 1777 y Fw(\)\))h(=)257 1897 y Fs(mar)s(k)s Fw(\()p Fs(r)s(oot)p Fw(\()p Fs(t)781 1861 y Fr(\003)781 1922 y Fq(2)821 1897 y Fw(\)\))c(implies)e Fs(t)1325 1861 y Fr(\003)1325 1922 y Fq(1)1417 1897 y Fw(=)52 b Fs(t)1580 1861 y Fr(\003)1580 1922 y Fq(2)1620 1897 y Fw(.)87 b(F)-8 b(or)47 b(example,)j(the)e(term)f(0)2831 1861 y Fq(1)2902 1897 y Fw(+)2978 1861 y Fq(0)3049 1897 y Fw(0)3098 1861 y Fq(1)3185 1897 y Fw(is)f(w)m(ell-)257 2017 y(mark)m(ed)35 b(but)g(0)836 1981 y Fq(1)899 2017 y Fw(+)975 1981 y Fq(1)1038 2017 y Fw(0)1087 1981 y Fq(1)1161 2017 y Fw(is)g(not.)49 b(If)35 b(a)g(term)f Fs(t)1933 1981 y Fr(\003)2007 2017 y Fw(is)h(w)m(ell-mark)m(ed)e(and)i Fs(\026)d Fu(2)f Fs(mar)s(k)s(s)p Fw(\()p Fs(t)3390 1981 y Fr(\003)3430 2017 y Fw(\),)257 2138 y(then)h Fs(t)513 2102 y Fr(\003)552 2138 y Fu(n)p Fs(\026)e Fw(denotes)i(the)f(unique)g (subterm)g Fs(s)1947 2102 y Fr(\003)2017 2138 y Fw(of)f Fs(t)2161 2102 y Fr(\003)2231 2138 y Fw(for)g(whic)m(h)h Fs(mar)s(k)s Fw(\()p Fs(r)s(oot)p Fw(\()p Fs(s)3190 2102 y Fr(\003)3229 2138 y Fw(\)\))d(=)g Fs(\026)257 2258 y Fw(holds.)50 b(W)-8 b(ell-mark)m(ed)33 b(terms)h(ha)m(v)m(e)i(an)f (exact)g(corresp)s(ondance)h(to)f(directed)g(acyclic)257 2379 y(graphs;)k(the)e(reader)h(is)e(referred)h(to)g([12)o(])g(for)f (details.)55 b(In)36 b(con)m(trast)i(to)e([12],)h(w)m(e)h(are)257 2499 y(solely)f(in)m(terested)i(in)e(w)m(ell-mark)m(ed)g(terms.)58 b(Th)m(us,)41 b(throughout)c(the)h(whole)g(pap)s(er,)257 2619 y(mark)m(ed)30 b(stands)h(for)f(w)m(ell-mark)m(ed.)41 b(Tw)m(o)31 b(subterms)g Fs(t)2299 2583 y Fr(\003)2299 2644 y Fq(1)2368 2619 y Fw(and)f Fs(t)2590 2583 y Fr(\003)2590 2644 y Fq(2)2659 2619 y Fw(of)g(a)f(mark)m(ed)h(term)g Fs(t)3456 2583 y Fr(\003)257 2740 y Fw(are)j(shared)g(in)f Fs(t)878 2704 y Fr(\003)950 2740 y Fw(if)g Fs(t)1075 2704 y Fr(\003)1075 2764 y Fq(1)1142 2740 y Fw(=)c Fs(t)1281 2704 y Fr(\003)1281 2764 y Fq(2)1320 2740 y Fw(;)33 b(e.g.)g(0)1608 2704 y Fq(1)1680 2740 y Fw(and)f(0)1918 2704 y Fq(1)1990 2740 y Fw(are)h(shared)g(in)f(0)2625 2704 y Fq(1)2686 2740 y Fw(+)2762 2704 y Fq(0)2824 2740 y Fw(0)2873 2704 y Fq(1)2912 2740 y Fw(.)404 2860 y(If)38 b Fs(t)542 2824 y Fr(\003)620 2860 y Fw(is)g(a)g(mark)m(ed)h(term,)h(then)f Fs(e)p Fw(\()p Fs(t)1778 2824 y Fr(\003)1818 2860 y Fw(\))f(denotes)i (the)f(unmark)m(ed)g(term)f(obtained)257 2980 y(from)j Fs(t)532 2944 y Fr(\003)614 2980 y Fw(b)m(y)i(erasing)f(all)e(marks.)73 b(Tw)m(o)43 b(mark)m(ed)g(terms)f Fs(s)2516 2944 y Fr(\003)2597 2980 y Fw(and)h Fs(t)2832 2944 y Fr(\003)2914 2980 y Fw(are)f Fv(bisimilar)3457 2944 y Fq(1)257 3101 y Fw(\(denoted)36 b(b)m(y)g Fs(s)850 3065 y Fr(\003)922 3101 y Fu(\030)c Fs(t)1066 3065 y Fr(\003)1106 3101 y Fw(\))j(if)f(and)h(only)f(if)g Fs(e)p Fw(\()p Fs(s)1900 3065 y Fr(\003)1940 3101 y Fw(\))e(=)g Fs(e)p Fw(\()p Fs(t)2236 3065 y Fr(\003)2275 3101 y Fw(\).)51 b(The)36 b(mark)m(ed)g(terms)f Fs(s)3264 3065 y Fr(\003)3338 3101 y Fw(and)257 3221 y Fs(t)292 3185 y Fr(\003)376 3221 y Fw(are)45 b Fv(isomorphic)e Fw(\(denoted)i(b)m(y)h Fs(s)1672 3185 y Fr(\003)1759 3194 y Fu(\030)1760 3225 y Fw(=)1885 3221 y Fs(t)1920 3185 y Fr(\003)1959 3221 y Fw(\))f(if)e(and)i(only)f(if)f Fs(t)2707 3185 y Fr(\003)2791 3221 y Fw(can)i(b)s(e)g(obtained)257 3342 y(from)d Fs(s)544 3305 y Fr(\003)627 3342 y Fw(b)m(y)i(a)f Fv(r)-5 b(enaming)42 b Fw(of)g(marks,)k(that)d(is,)j(there)e(exists)g(a)f(bijectiv)m(e)g (function)257 3462 y(\010)31 b(:)f Fs(mar)s(k)s(s)p Fw(\()p Fs(s)782 3426 y Fr(\003)822 3462 y Fw(\))g Fu(!)g Fs(mar)s(k)s(s)p Fw(\()p Fs(t)1376 3426 y Fr(\003)1416 3462 y Fw(\))k(suc)m(h)h(that)f (\010\()p Fs(s)2076 3426 y Fr(\003)2116 3462 y Fw(\))c(=)g Fs(t)2325 3426 y Fr(\003)2365 3462 y Fw(,)k(where)i(the)e(extension)h (of)f(\010)257 3582 y(to)f Fu(T)431 3597 y Fp(w)487 3582 y Fw(\()p Fu(F)607 3546 y Fr(\003)646 3582 y Fs(;)17 b Fu(V)759 3546 y Fr(\003)799 3582 y Fw(\))32 b(is)g(de\014ned)i(b)m(y) 661 3862 y(\010\()p Fs(s)815 3821 y Fr(\003)854 3862 y Fw(\))28 b(=)1024 3722 y Ft(\032)1140 3801 y Fs(x)1195 3765 y Fq(\010\()p Fp(\026)p Fq(\))2178 3801 y Fw(if)j Fs(s)2313 3765 y Fr(\003)2380 3801 y Fw(=)d Fs(x)2539 3765 y Fp(\026)2586 3801 y Fs(;)17 b(x)28 b Fu(2)g(V)8 b Fs(;)1140 3923 y(f)1199 3887 y Fq(\010\()p Fp(\026)p Fq(\))1351 3923 y Fw(\(\010\()p Fs(t)1532 3887 y Fr(\003)1532 3948 y Fq(1)1572 3923 y Fw(\))p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(\010\()p Fs(t)1972 3887 y Fr(\003)1972 3948 y Fp(n)2019 3923 y Fw(\)\))83 b(if)31 b Fs(s)2313 3887 y Fr(\003)2380 3923 y Fw(=)d Fs(f)2543 3887 y Fp(\026)2589 3923 y Fw(\()p Fs(t)2662 3887 y Fr(\003)2662 3948 y Fq(1)2702 3923 y Fs(;)17 b(:)g(:)g(:)f(;)h(t)2956 3887 y Fr(\003)2956 3948 y Fp(n)3003 3923 y Fw(\))257 4137 y(Note)46 b(that)e Fs(s)775 4100 y Fr(\003)864 4109 y Fu(\030)865 4141 y Fw(=)990 4137 y Fs(t)1025 4100 y Fr(\003)1110 4137 y Fw(implies)e Fs(s)1499 4100 y Fr(\003)1588 4137 y Fu(\030)49 b Fs(t)1749 4100 y Fr(\003)1789 4137 y Fw(.)81 b(The)46 b(marks)f(of)f(a)h(mark)m(ed)g(term)g Fs(s)3281 4100 y Fr(\003)3365 4137 y Fw(are)257 4257 y(called)33 b Fv(fr)-5 b(esh)33 b Fw(w.r.t.)i(another)f(mark)m(ed)g(term)f Fs(t)2007 4221 y Fr(\003)2081 4257 y Fw(if)g Fs(mar)s(k)s(s)p Fw(\()p Fs(s)2539 4221 y Fr(\003)2578 4257 y Fw(\))23 b Fu(\\)g Fs(mar)s(k)s(s)p Fw(\()p Fs(t)3084 4221 y Fr(\003)3124 4257 y Fw(\))30 b(=)g Fu(;)p Fw(.)47 b(A)257 4377 y Fv(marke)-5 b(d)44 b(substitution)f Fs(\033)1199 4341 y Fr(\003)1284 4377 y Fw(:)i Fu(V)1425 4335 y Fr(\003)1510 4377 y Fu(!)f(T)26 b Fw(\()p Fu(F)1854 4341 y Fr(\003)1893 4377 y Fs(;)17 b Fu(V)2006 4341 y Fr(\003)2045 4377 y Fw(\))43 b(is)f(a)h (substitution)f(whic)m(h)h(satis\014es)257 4498 y Fs(x)312 4462 y Fp(\026)359 4498 y Fs(\033)418 4462 y Fr(\003)501 4498 y Fu(\030)h Fs(x)677 4462 y Fp(\027)721 4498 y Fs(\033)780 4462 y Fr(\003)861 4498 y Fw(for)d(all)f Fs(x)1219 4462 y Fp(\026)1266 4498 y Fs(;)17 b(x)1365 4462 y Fp(\027)1451 4498 y Fu(2)44 b(D)s Fw(\()p Fs(\033)1738 4462 y Fr(\003)1777 4498 y Fw(\))e(with)f Fs(sy)t(mbol)r Fw(\()p Fs(x)2483 4462 y Fp(\026)2530 4498 y Fw(\))i(=)g Fs(sy)t(mbol)r Fw(\()p Fs(x)3125 4462 y Fp(\027)3169 4498 y Fw(\).)71 b(This)257 4618 y(de\014nition)46 b(of)h(mark)m(ed)g(substitution)g (ensures)i(that)e(the)g(unmark)m(ed)h(substitution)257 4738 y Fs(\033)e Fw(obtained)41 b(from)g Fs(\033)1067 4702 y Fr(\003)1148 4738 y Fw(b)m(y)i(erasing)e(all)f(marks)h(is)g(w)m (ell-de\014ned)h(\(i.e.,)i Fs(\033)i Fw(really)40 b(is)h(a)257 4859 y(substitution\).)h(Let)29 b Fs(\033)1105 4823 y Fr(\003)1101 4883 y Fq(1)1173 4859 y Fw(and)f Fs(\033)1417 4823 y Fr(\003)1413 4883 y Fq(2)1485 4859 y Fw(b)s(e)h(mark)m(ed)g (substitutions)f(with)h Fu(D)s Fw(\()p Fs(\033)2930 4823 y Fr(\003)2926 4883 y Fq(1)2969 4859 y Fw(\))e(=)h Fu(D)s Fw(\()p Fs(\033)3315 4823 y Fr(\003)3311 4883 y Fq(2)3354 4859 y Fw(\))f(=)257 4979 y Fu(f)p Fs(x)362 4932 y Fp(\026)404 4941 y Fl(1)362 5004 y Fq(1)444 4979 y Fs(;)17 b(:)g(:)g(:)f(;)h(x)718 4943 y Fp(\026)760 4951 y Fm(n)718 5004 y Fp(n)807 4979 y Fu(g)p Fw(.)40 b Fs(\033)983 4943 y Fr(\003)979 5004 y Fq(1)1044 4979 y Fw(and)22 b Fs(\033)1282 4943 y Fr(\003)1278 5004 y Fq(2)1343 4979 y Fw(are)g Fv(isomorphic)e Fw(\()p Fs(\033)2078 4943 y Fr(\003)2074 5004 y Fq(1)2145 4952 y Fu(\030)2146 4983 y Fw(=)2250 4979 y Fs(\033)2309 4943 y Fr(\003)2305 5004 y Fq(2)2349 4979 y Fw(\))i(if)e Fs(D)2571 4943 y Fp(\026)2618 4979 y Fw(\()p Fs(x)2711 4932 y Fp(\026)2753 4941 y Fl(1)2711 5004 y Fq(1)2792 4979 y Fs(\033)2851 4943 y Fr(\003)2847 5004 y Fq(1)2891 4979 y Fs(;)d(:)g(:)g(:)e(;)i(x) 3164 4943 y Fp(\026)3206 4951 y Fm(n)3164 5004 y Fp(n)3254 4979 y Fs(\033)3313 4943 y Fr(\003)3309 5004 y Fq(1)3352 4979 y Fw(\))3418 4952 y Fu(\030)3419 4983 y Fw(=)257 5100 y Fs(D)341 5063 y Fp(\026)388 5100 y Fw(\()p Fs(x)481 5052 y Fp(\026)523 5061 y Fl(1)481 5124 y Fq(1)562 5100 y Fs(\033)621 5063 y Fr(\003)617 5124 y Fq(2)661 5100 y Fs(;)g(:)g(:)g(:)f(;)h(x)935 5063 y Fp(\026)977 5071 y Fm(n)935 5124 y Fp(n)1024 5100 y Fs(\033)1083 5063 y Fr(\003)1079 5124 y Fq(2)1122 5100 y Fw(\),)35 b(where)h Fs(D)h Fw(is)e(a)f(fresh)h(sym)m(b)s(ol)f(of)g(arit)m(y)g Fs(n)h Fw(and)g Fs(\026)f Fw(is)g(a)g(fresh)p 257 5193 1296 4 v 370 5254 a Fg(1)407 5284 y Ff(The)27 b(origin)g(of)g(the)h (notion)g(\\bisimilarit)n(y")e(is)h(explained)g(in)h([2].)1828 5637 y Fw(12)p eop %%Page: 13 13 13 12 bop 257 573 a Fw(mark)31 b(w.r.t.)g(ev)m(ery)h Fs(x)1076 526 y Fp(\026)1118 536 y Fm(i)1076 598 y Fp(i)1150 573 y Fs(\033)1209 537 y Fr(\003)1205 597 y Fp(j)1248 573 y Fw(,)f(where)h(1)c Fu(\024)g Fs(i)g Fu(\024)g Fs(n)j Fw(and)g(1)c Fu(\024)h Fs(j)34 b Fu(\024)28 b Fw(2.)43 b(The)31 b(notion)f Fv(marke)-5 b(d)257 693 y(c)g(ontext)33 b Fw(is)f(de\014ned)i(in)e(the)h(ob)m(vious)f(w)m(a)m(y)-8 b(.)404 814 y(F)g(or)34 b(instance,)j(0)1041 777 y Fq(1)1105 814 y Fw(+)1181 777 y Fq(0)1244 814 y Fw(0)1293 777 y Fq(1)1365 786 y Fu(\030)1366 818 y Fw(=)1476 814 y(0)1525 777 y Fq(2)1588 814 y Fw(+)1664 777 y Fq(0)1728 814 y Fw(0)1777 777 y Fq(2)1851 814 y Fw(but)f(0)2082 777 y Fq(1)2146 814 y Fw(+)2222 777 y Fq(0)2285 814 y Fw(0)2334 777 y Fq(1)2406 814 y Fu(6)2406 786 y(\030)2407 818 y Fw(=)2517 814 y(0)2566 777 y Fq(1)2629 814 y Fw(+)2705 777 y Fq(0)2769 814 y Fw(0)2818 777 y Fq(2)2857 814 y Fw(.)52 b(On)36 b(the)g(other)257 934 y(hand,)d(0)577 898 y Fq(1)637 934 y Fw(+)713 898 y Fq(0)773 934 y Fw(0)822 898 y Fq(1)888 934 y Fu(\030)c Fw(0)1043 898 y Fq(1)1102 934 y Fw(+)1178 898 y Fq(0)1238 934 y Fw(0)1287 898 y Fq(2)1327 934 y Fw(.)43 b(Moreo)m(v)m(er,)33 b Fs(\033)1910 898 y Fr(\003)1906 959 y Fq(1)1978 934 y Fw(=)27 b Fu(f)p Fs(x)2186 949 y Fq(1)2253 934 y Fu(7!)h Fw(0)2430 898 y Fq(1)2490 934 y Fw(+)2566 898 y Fq(0)2626 934 y Fw(0)2675 898 y Fq(1)2714 934 y Fs(;)17 b(x)2813 949 y Fq(2)2880 934 y Fu(7!)27 b Fw(0)3056 898 y Fq(1)3116 934 y Fw(+)3192 898 y Fq(0)3252 934 y Fw(0)3301 898 y Fq(1)3340 934 y Fu(g)h(6)3418 906 y(\030)3419 938 y Fw(=)257 1054 y Fu(f)p Fs(x)362 1069 y Fq(1)430 1054 y Fu(7!)f Fw(0)606 1018 y Fq(1)667 1054 y Fw(+)743 1018 y Fq(0)805 1054 y Fw(0)854 1018 y Fq(1)893 1054 y Fs(;)17 b(x)992 1069 y Fq(2)1059 1054 y Fu(7!)28 b Fw(0)1236 1018 y Fq(3)1297 1054 y Fw(+)1373 1018 y Fq(2)1434 1054 y Fw(0)1483 1018 y Fq(3)1523 1054 y Fu(g)f Fw(=)h Fs(\033)1763 1018 y Fr(\003)1759 1079 y Fq(2)1802 1054 y Fw(.)257 1283 y Fo(De\014nition)36 b(4.1)49 b Fw(A)30 b(rule)f Fs(l)1298 1247 y Fr(\003)1365 1283 y Fu(!)e Fs(r)1539 1247 y Fr(\003)1606 1283 y Fu(\()g Fs(c)1775 1247 y Fr(\003)1844 1283 y Fw(is)i(a)g Fv(marke)-5 b(d)31 b(version)d Fw(of)h(a)g(rule)f Fs(l)i Fu(!)e Fs(r)i Fu(\()d Fs(c)257 1403 y Fw(in)e Fu(R)h Fw(if)e Fs(e)p Fw(\()p Fs(l)670 1367 y Fr(\003)710 1403 y Fw(\))k(=)f Fs(l)r Fw(,)h Fs(e)p Fw(\()p Fs(r)1095 1367 y Fr(\003)1134 1403 y Fw(\))g(=)f Fs(r)s Fw(,)g Fs(e)p Fw(\()p Fs(c)1529 1367 y Fr(\003)1568 1403 y Fw(\))h(=)g Fs(c)p Fw(,)f(and,)g(for)e(all)e Fs(x)2370 1367 y Fp(\026)2417 1403 y Fs(;)17 b(y)2513 1367 y Fp(\027)2583 1403 y Fu(2)28 b(V)8 b Fs(ar)s Fw(\()p Fs(l)2913 1367 y Fr(\003)2980 1403 y Fu(!)28 b Fs(r)3155 1367 y Fr(\003)3221 1403 y Fu(\()g Fs(c)3391 1367 y Fr(\003)3430 1403 y Fw(\),)257 1523 y Fs(sy)t(mbol)r Fw(\()p Fs(x)652 1487 y Fp(\026)699 1523 y Fw(\))g(=)g Fs(sy)t(mbol)r Fw(\()p Fs(y)1261 1487 y Fp(\027)1303 1523 y Fw(\))k(if)g(and)g(only)g (if)g Fs(mar)s(k)s Fw(\()p Fs(x)2286 1487 y Fp(\026)2333 1523 y Fw(\))c(=)f Fs(mar)s(k)s Fw(\()p Fs(y)2829 1487 y Fp(\027)2872 1523 y Fw(\).)404 1752 y(The)43 b(last)e(condition)g (can)h(b)s(e)h(rephrased)g(as:)63 b(ev)m(ery)44 b(mark)m(ed)e(o)s (ccurrence)i(of)d(a)257 1872 y(v)-5 b(ariable)29 b Fs(x)f Fu(2)g(V)8 b Fs(ar)s Fw(\()p Fs(l)30 b Fu(!)e Fs(r)i Fu(\()d Fs(c)p Fw(\))k(m)m(ust)g(ha)m(v)m(e)h(the)f(same)f(mark)g(in)g Fs(l)2766 1836 y Fr(\003)2833 1872 y Fu(!)e Fs(r)3008 1836 y Fr(\003)3074 1872 y Fu(\()g Fs(c)3244 1836 y Fr(\003)3283 1872 y Fw(.)43 b(F)-8 b(or)257 1993 y(the)45 b(sak)m(e)h(of)d (simplicit)m(y)-8 b(,)45 b(marks)f(on)g(v)-5 b(ariables)43 b(in)h(mark)m(ed)g(rewrite)h(rules)f(will)e(b)s(e)257 2113 y(omitted)32 b(in)h(the)h(follo)m(wing)d(b)s(ecause)k(these)g (marks)f(are)f(unique)h(an)m(yw)m(a)m(y)-8 b(.)49 b(So)33 b(on)h(the)257 2233 y(one)46 b(hand,)i(v)-5 b(ariables)44 b(in)h(rewrite)g(rules)g(are)g(maximally)c(shared.)82 b(On)45 b(the)h(other)257 2354 y(hand,)30 b(b)m(y)f(using)e(fresh)i (and)f(m)m(utually)e(distinct)h(marks)h(for)g(the)g(righ)m(t-hand)f (side)h(and)257 2474 y(the)h(conditional)d(part)j(of)f(a)g(rewrite)h (rule,)g(w)m(e)g(adopt)g(a)f(\\minimal)c(structure)30 b(sharing)257 2594 y(sc)m(heme")k(\(di\013eren)m(t)f(structure)h (sharing)e(sc)m(hemes)i(are)e(discussed)j(in)d([12)o(]\).)257 2823 y Fo(De\014nition)k(4.2)49 b Fw(Let)g Fu(R)f Fw(b)s(e)g(a)g (3-CTRS)g(with)g(strict)f(equalit)m(y)-8 b(.)90 b(Let)48 b Fs(s)3128 2787 y Fr(\003)3215 2823 y Fw(and)h Fs(t)3456 2787 y Fr(\003)257 2943 y Fw(b)s(e)44 b(mark)m(ed)g(terms.)76 b(Let)44 b Fu(\))1387 2958 y Fr(R)1447 2967 y Fl(0)1485 2943 y Fw(=)j Fu(;)c Fw(and)h(for)f Fs(n)j(>)g Fw(0,)g(de\014ne)f Fs(s)2749 2907 y Fr(\003)2821 2943 y Fu(\))2921 2958 y Fr(R)2981 2966 y Fm(n)3060 2943 y Fs(t)3095 2907 y Fr(\003)3178 2943 y Fw(if)d(there)257 3064 y(exists)54 b(a)e(mark)m(ed)h(v)m(ersion)g Fs(l)1397 3027 y Fr(\003)1464 3064 y Fu(!)27 b Fs(r)1638 3027 y Fr(\003)1705 3064 y Fu(\()g Fs(s)1878 3027 y Fr(\003)1878 3088 y Fq(1)1918 3064 y Fw(==)o Fs(t)2104 3027 y Fr(\003)2104 3088 y Fq(1)2144 3064 y Fs(;)17 b(:)g(:)g(:)33 b(;)17 b(s)2426 3027 y Fr(\003)2426 3089 y Fp(k)2468 3064 y Fw(==)p Fs(t)2655 3027 y Fr(\003)2655 3089 y Fp(k)2750 3064 y Fw(of)52 b(a)g(rewrite)h(rule)257 3184 y Fs(\032)28 b Fw(:)g Fs(l)i Fu(!)d Fs(r)k Fu(\()c Fs(s)824 3199 y Fq(1)863 3184 y Fw(==)p Fs(t)1050 3199 y Fq(1)1090 3184 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)1371 3199 y Fp(k)1414 3184 y Fw(==)o Fs(t)1600 3199 y Fp(k)1688 3184 y Fw(from)44 b Fu(R)q Fw(,)k(a)d(mark)m(ed)h (substitution)e Fs(\033)3159 3148 y Fr(\003)3244 3184 y Fw(and)h(a)257 3304 y(mark)m(ed)33 b(con)m(text)h Fs(C)1028 3268 y Fr(\003)1067 3304 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(])33 b(suc)m(h)h(that)403 3508 y Fu(\017)48 b Fs(s)547 3472 y Fr(\003)614 3508 y Fw(=)28 b Fs(C)795 3472 y Fr(\003)834 3508 y Fw([)p Fs(l)892 3472 y Fr(\003)932 3508 y Fs(\033)991 3472 y Fr(\003)1030 3508 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)1280 3472 y Fr(\003)1320 3508 y Fs(\033)1379 3472 y Fr(\003)1418 3508 y Fw(])33 b(and)f Fs(t)1702 3472 y Fr(\003)1770 3508 y Fw(=)27 b Fs(C)1950 3472 y Fr(\003)1990 3508 y Fw([)p Fs(r)2064 3472 y Fr(\003)2103 3508 y Fs(\033)2162 3472 y Fr(\003)2201 3508 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)2467 3472 y Fr(\003)2506 3508 y Fs(\033)2565 3472 y Fr(\003)2604 3508 y Fw(],)403 3711 y Fu(\017)48 b Fs(l)532 3675 y Fr(\003)572 3711 y Fs(\033)631 3675 y Fr(\003)703 3711 y Fw(is)32 b(not)g(a)h(subterm)g(of)f Fs(C)1624 3675 y Fr(\003)1663 3711 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(],)403 3914 y Fu(\017)48 b Fw(for)29 b(ev)m(ery)i(1)c Fu(\024)h Fs(i)g Fu(\024)g Fs(k)s Fw(,)i(there)g(are)f(mark)m(ed)g (ground)g(constructor)h(terms)f Fs(u)3270 3878 y Fr(\003)3270 3939 y Fp(i)3338 3914 y Fw(and)501 4035 y Fs(v)552 3999 y Fr(\003)548 4059 y Fp(i)624 4035 y Fw(suc)m(h)34 b(that)e Fs(s)1101 3999 y Fr(\003)1101 4059 y Fp(i)1141 4035 y Fs(\033)1200 3999 y Fr(\003)1267 4035 y Fu(\))1367 3999 y Fr(\003)1367 4060 y(R)1427 4069 y Fm(n)p Fk(\000)p Fl(1)1579 4035 y Fs(u)1635 3999 y Fr(\003)1635 4059 y Fp(i)1674 4035 y Fw(,)h Fs(t)1769 3999 y Fr(\003)1769 4059 y Fp(i)1809 4035 y Fs(\033)1868 3999 y Fr(\003)1935 4035 y Fu(\))2035 3999 y Fr(\003)2035 4060 y(R)2095 4069 y Fm(n)p Fk(\000)p Fl(1)2247 4035 y Fs(v)2298 3999 y Fr(\003)2294 4059 y Fp(i)2338 4035 y Fw(,)f(and)2554 3999 y Fq(2)2626 4035 y Fs(u)2682 3999 y Fr(\003)2682 4059 y Fp(i)2749 4035 y Fu(\030)c Fs(v)2905 3999 y Fr(\003)2901 4059 y Fp(i)2944 4035 y Fw(,)403 4238 y Fu(\017)48 b Fw(all)30 b(marks)h(on)g(function)g(sym)m(b)s(ols)g(in)g Fs(r)1971 4202 y Fr(\003)2010 4238 y Fw(,)h Fs(s)2115 4202 y Fr(\003)2115 4263 y Fp(i)2154 4238 y Fw(,)g Fs(t)2248 4202 y Fr(\003)2248 4263 y Fp(i)2287 4238 y Fw(,)g(and)g Fs(x\033)2649 4202 y Fr(\003)2720 4238 y Fw(\(for)f(ev)m(ery)i(v)-5 b(ariable)501 4359 y Fs(x)28 b Fu(2)g(E)9 b(V)f Fs(ar)s Fw(\()p Fs(\032)p Fw(\)\))33 b(are)f(m)m(utually)f(distinct)h(and)h (fresh)g(w.r.t.)44 b Fs(s)2774 4323 y Fr(\003)2813 4359 y Fw(.)257 4562 y(W)-8 b(e)33 b(call)64 b Fu(\))737 4577 y Fr(R)861 4562 y Fw(=)964 4487 y Ft(S)1047 4591 y Fp(n)p Fr(\025)p Fq(0)1234 4562 y Fu(\))1334 4577 y Fr(R)1394 4585 y Fm(n)1505 4562 y Fv(\(term\))35 b(gr)-5 b(aph)34 b(r)-5 b(ewrite)35 b(r)-5 b(elation)32 b Fw(w.r.t.)h Fu(R)p Fw(.)404 4790 y Fs(l)435 4754 y Fr(\003)474 4790 y Fs(\033)533 4754 y Fr(\003)617 4790 y Fw(is)44 b(called)f(the)i Fv(c)-5 b(ontr)g(acte)g(d)45 b(marke)-5 b(d)45 b(r)-5 b(e)g(dex)44 b Fw(in)f Fs(s)2452 4754 y Fr(\003)2492 4790 y Fw(.)79 b(W)-8 b(e)44 b(use)i(the)f(notation)257 4911 y Fs(s)303 4875 y Fr(\003)375 4911 y Fu(\))475 4875 y Fp(l)497 4851 y Fk(\003)533 4875 y Fp(\033)575 4851 y Fk(\003)475 4936 y Fr(R)535 4944 y Fm(n)648 4911 y Fs(t)683 4875 y Fr(\003)762 4911 y Fw(in)38 b(order)h(to)g(sp)s(ecify)g (the)h(con)m(tracted)g(mark)m(ed)f(redex.)64 b(Note)39 b(that)g(all)257 5031 y(shared)34 b(subterms)f Fs(l)1016 4995 y Fr(\003)1056 5031 y Fs(\033)1115 4995 y Fr(\003)1187 5031 y Fw(are)f(replaced)h(sim)m(ultaneously)e(b)m(y)j Fs(r)2579 4995 y Fr(\003)2618 5031 y Fs(\033)2677 4995 y Fr(\003)2717 5031 y Fw(.)p 257 5119 1296 4 v 370 5180 a Fg(2)407 5210 y Ff(Note)27 b(that)h Fe(u)835 5180 y Fd(\003)835 5232 y Fc(i)896 5188 y Fb(\030)896 5214 y Ff(=)984 5210 y Fe(v)1027 5180 y Fd(\003)1024 5232 y Fc(i)1093 5210 y Ff(is)f(not)h(required.)1828 5637 y Fw(13)p eop %%Page: 14 14 14 13 bop 257 573 a Fo(De\014nition)36 b(4.3)49 b Fw(The)44 b Fv(deterministic)e Fw(graph)h(rewrite)g(relation)73 b Fu(\))2908 592 y Fr(R)2968 573 y Fm(d)83 b Fw(is)43 b(de\014ned)257 693 y(analogously)31 b(to)64 b Fu(\))1037 708 y Fr(R)1134 693 y Fw(:)43 b(in)32 b(a)64 b Fu(\))1531 712 y Fr(R)1591 694 y Fm(d)1591 729 y(n)1702 693 y Fw(rewrite)32 b(step,)i(if)d Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))27 b Fu(6\022)h(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\),)33 b(then)f(it)g(is) 257 814 y(additionally)24 b(required)k(that)f Fs(x\033)1488 777 y Fr(\003)1554 814 y Fw(is)g(a)g(mark)m(ed)g(ground)g(constructor)h (term)f(for)f(ev)m(ery)257 934 y(extra)33 b(v)-5 b(ariable)31 b Fs(x)i Fw(in)f Fs(l)e Fu(!)d Fs(r)k Fu(\()c Fs(c)p Fw(.)404 1154 y(In)45 b(order)h(to)f(illustrate)e(ho)m(w)j(graph)f (rewriting)f(w)m(orks,)51 b(let)44 b Fu(R)i Fw(b)s(e)g(the)f(CTRS)257 1275 y Fu(R)342 1290 y Fp(f)7 b(ib)476 1275 y Fw(from)33 b(Section)h(3)g(augmen)m(ted)h(b)m(y)g(the)g(rewrite)f(rules)h Fs(doubl)r(e)p Fw(\()p Fs(x)p Fw(\))c Fu(!)f Fs(x)24 b Fw(+)f Fs(x)35 b Fw(and)257 1395 y Fs(snd)p Fw(\()p Fu(h)p Fs(x;)17 b(y)t Fu(i)p Fw(\))27 b Fu(!)g Fs(y)t Fw(.)42 b(There)34 b(is)e(the)66 b Fu(\))1673 1410 y Fr(R)1802 1395 y Fw(\(in)32 b(fact,)65 b Fu(\))2306 1414 y Fr(R)2366 1396 y Fm(d)2438 1395 y Fw(\))33 b(reduction)f(sequence:) 299 1605 y Fs(doubl)r(e)570 1569 y Fq(0)609 1605 y Fw(\()p Fs(snd)802 1569 y Fq(1)842 1605 y Fw(\()p Fs(f)11 b(ib)1013 1569 y Fq(2)1052 1605 y Fw(\()p Fs(s)1136 1569 y Fq(3)1176 1605 y Fw(\(0)1263 1569 y Fq(4)1302 1605 y Fw(\)\)\)\))115 b Fu(\))1669 1620 y Fr(R)1849 1605 y Fs(snd)2004 1569 y Fq(1)2043 1605 y Fw(\()p Fs(f)11 b(ib)2214 1569 y Fq(2)2254 1605 y Fw(\()p Fs(s)2338 1569 y Fq(3)2377 1605 y Fw(\(0)2464 1569 y Fq(4)2503 1605 y Fw(\)\)\))22 b(+)2715 1569 y Fq(5)2777 1605 y Fs(snd)2932 1569 y Fq(1)2971 1605 y Fw(\()p Fs(f)11 b(ib)3142 1569 y Fq(2)3182 1605 y Fw(\()p Fs(s)3266 1569 y Fq(3)3305 1605 y Fw(\(0)3392 1569 y Fq(4)3431 1605 y Fw(\)\)\))1569 1726 y Fu(\))1669 1741 y Fr(R)1849 1726 y Fs(snd)2004 1690 y Fq(1)2043 1726 y Fw(\()p Fs(t)2116 1690 y Fr(\003)2156 1726 y Fw(\))22 b(+)2292 1690 y Fq(5)2353 1726 y Fs(snd)2508 1690 y Fq(1)2547 1726 y Fw(\()p Fs(t)2620 1690 y Fr(\003)2660 1726 y Fw(\))1569 1846 y Fu(\))1669 1861 y Fr(R)1849 1846 y Fw(\(0)1936 1810 y Fq(8)1997 1846 y Fw(+)2073 1810 y Fq(12)2170 1846 y Fs(s)2216 1810 y Fq(9)2255 1846 y Fw(\(0)2342 1810 y Fq(10)2417 1846 y Fw(\)\))g(+)2591 1810 y Fq(5)2652 1846 y Fw(\(0)2739 1810 y Fq(8)2800 1846 y Fw(+)2876 1810 y Fq(12)2973 1846 y Fs(s)3019 1810 y Fq(9)3058 1846 y Fw(\(0)3145 1810 y Fq(10)3220 1846 y Fw(\)\))1569 1967 y Fu(\))1669 1982 y Fr(R)1849 1967 y Fs(s)1895 1930 y Fq(9)1934 1967 y Fw(\(0)2021 1930 y Fq(10)2096 1967 y Fw(\))g(+)2232 1930 y Fq(5)2293 1967 y Fs(s)2339 1930 y Fq(9)2378 1967 y Fw(\(0)2465 1930 y Fq(10)2540 1967 y Fw(\))257 2183 y(b)s(ecause)33 b Fs(f)11 b(ib)750 2147 y Fq(6)790 2183 y Fw(\(0)877 2147 y Fq(4)916 2183 y Fw(\))32 b Fu(\))1086 2198 y Fr(R)1183 2183 y Fu(h)p Fw(0)1271 2147 y Fq(8)1310 2183 y Fs(;)17 b(s)1400 2147 y Fq(9)1439 2183 y Fw(\(0)1526 2147 y Fq(10)1600 2183 y Fw(\))p Fu(i)1677 2147 y Fq(7)1716 2183 y Fw(.)43 b(In)32 b(the)f(deriv)-5 b(ation,)30 b Fs(t)2592 2147 y Fr(\003)2663 2183 y Fw(denotes)i(the)g (mark)m(ed)257 2303 y(term)g Fu(h)p Fs(s)575 2267 y Fq(9)615 2303 y Fw(\(0)702 2267 y Fq(10)776 2303 y Fw(\))p Fs(;)17 b Fw(0)907 2267 y Fq(8)968 2303 y Fw(+)1044 2267 y Fq(12)1141 2303 y Fs(s)1187 2267 y Fq(9)1226 2303 y Fw(\(0)1313 2267 y Fq(10)1388 2303 y Fw(\))p Fu(i)1465 2267 y Fq(11)1539 2303 y Fw(.)257 2591 y Fa(4.1)136 b(Adequacy)257 2776 y Fw(Next)39 b(w)m(e)g(will)d(sho)m(w)j(that)e(the)i(mapping)d Fs(e)i Fw(whic)m(h)g(erases)i(all)35 b(marks)j(from)f(a)g(w)m(ell-)257 2896 y(mark)m(ed)23 b(term)e(is)h(an)g(adequate)h(mapping)d(in)h(the)i (sense)h(of)d(Kenna)m(w)m(a)m(y)j(et)f(al.)d([10],)k(that)257 3016 y(is)29 b(to)f(sa)m(y)-8 b(,)30 b(it)e(is)g(surjectiv)m(e,)j (preserv)m(es)g(normal)c(forms,)h(preserv)m(es)k(reductions,)e(and)f (is)257 3137 y(co\014nal.)42 b(Surjectivit)m(y)27 b(ensures)j(that)d (ev)m(ery)j(term)d(can)h(b)s(e)g(represen)m(ted)i(as)d(a)h(directed)257 3257 y(acyclic)g(graph)g(\(w)m(ell-mark)m(ed)g(term\).)41 b(The)30 b(normal)c(form)h(condition)g(ensures)j(that)e(a)257 3378 y(graph)f(is)g(a)g(\014nal)f(result)h(of)g(a)g(computation)e(if)h (the)i(term)e(whic)m(h)i(it)e(represen)m(ts)j(also)e(is,)257 3498 y(and)i(vice)h(v)m(ersa.)43 b(Preserv)-5 b(ation)29 b(of)g(reduction)g(ensures)i(that)e(ev)m(ery)h(graph)f(reduction)257 3618 y(sequence)41 b(represen)m(ts)f(some)d(term)g(reduction)h (sequence.)61 b(Co\014nalit)m(y)37 b(ensures)i(that)257 3739 y(for)25 b(ev)m(ery)i(term)d(rewriting)g(computation,)h(there)h (is)e(a)h(graph)g(rewriting)f(computation)257 3859 y(whic)m(h)h(can)f (b)s(e)g(mapp)s(ed,)i(not)e(necessarily)g(to)g(the)g(term)g(rewriting)f (computation,)h(but)257 3980 y(to)36 b(some)g(extension)g(of)g(it.)52 b(Recall)34 b(that)i Fu(R)g Fw(denotes)h(an)f(almost)e(functional)g (CTRS)257 4100 y(unless)g(stated)f(otherwise.)257 4320 y Fo(Theorem)k(4.4)49 b Fv(F)-7 b(or)27 b(al)5 b(l)27 b Fs(n)h Fu(2)g Fi(N)9 b Fv(,)70 b Fu(\))1677 4340 y Fr(R)1737 4321 y Fm(d)1737 4356 y(n)1846 4320 y Fv(is)27 b(an)g(ade)-5 b(quate)27 b(implementation)g(of)g Fu(!)3359 4340 y Fr(R)3419 4321 y Fm(d)3419 4356 y(n)3465 4320 y Fv(,)257 4441 y(that)36 b(is,)373 4638 y(1.)48 b Fs(e)35 b Fv(is)g(surje)-5 b(ctive,)373 4840 y(2.)48 b Fu(8)p Fs(t)591 4804 y Fr(\003)659 4840 y Fu(2)28 b(T)807 4855 y Fp(w)864 4840 y Fw(\()p Fu(F)984 4804 y Fr(\003)1023 4840 y Fs(;)17 b Fu(V)1136 4804 y Fr(\003)1175 4840 y Fw(\))p Fv(:)45 b Fs(t)1323 4804 y Fr(\003)1390 4840 y Fu(2)28 b Fs(N)10 b(F)k Fw(\()35 b Fu(\))1822 4859 y Fr(R)1882 4840 y Fm(d)1882 4876 y(n)1964 4840 y Fw(\))f Fv(if)h(and)f(only)h(if)g Fs(e)p Fw(\()p Fs(t)2745 4804 y Fr(\003)2784 4840 y Fw(\))28 b Fu(2)g Fs(N)10 b(F)k Fw(\()p Fu(!)3247 4859 y Fr(R)3307 4840 y Fm(d)3307 4876 y(n)3354 4840 y Fw(\))p Fv(,)373 5041 y(3.)48 b Fu(8)p Fs(s)602 5005 y Fr(\003)670 5041 y Fu(2)28 b(T)818 5056 y Fp(w)875 5041 y Fw(\()p Fu(F)995 5005 y Fr(\003)1033 5041 y Fs(;)17 b Fu(V)1146 5005 y Fr(\003)1186 5041 y Fw(\))p Fv(:)44 b(if)35 b Fs(s)1439 5005 y Fr(\003)1513 5041 y Fu(\))1613 5005 y Fr(\003)1613 5074 y(R)1673 5056 y Fm(d)1673 5091 y(n)1755 5041 y Fs(t)1790 5005 y Fr(\003)1829 5041 y Fv(,)g(then)g Fs(e)p Fw(\()p Fs(s)2240 5005 y Fr(\003)2279 5041 y Fw(\))p Fu(!)2417 5005 y Fr(\003)2417 5074 y(R)2477 5056 y Fm(d)2477 5091 y(n)2524 5041 y Fs(e)p Fw(\()p Fs(t)2642 5005 y Fr(\003)2682 5041 y Fw(\))p Fv(,)373 5255 y(4.)48 b Fu(8)p Fs(s)602 5219 y Fr(\003)674 5255 y Fu(2)33 b(T)827 5270 y Fp(w)884 5255 y Fw(\()p Fu(F)1004 5219 y Fr(\003)1043 5255 y Fs(;)17 b Fu(V)1156 5219 y Fr(\003)1195 5255 y Fw(\))p Fv(:)50 b(if)37 b Fs(e)p Fw(\()p Fs(s)1539 5219 y Fr(\003)1579 5255 y Fw(\))p Fu(!)1717 5219 y Fr(\003)1717 5288 y(R)1777 5270 y Fm(d)1777 5305 y(n)1823 5255 y Fs(u)p Fv(,)g(then)h(ther)-5 b(e)37 b(is)g(a)g Fs(t)2640 5219 y Fr(\003)2712 5255 y Fu(2)c(T)2865 5270 y Fp(w)2922 5255 y Fw(\()p Fu(F)3042 5219 y Fr(\003)3081 5255 y Fs(;)17 b Fu(V)3194 5219 y Fr(\003)3233 5255 y Fw(\))37 b Fv(such)501 5388 y(that)e Fs(s)746 5352 y Fr(\003)821 5388 y Fu(\))921 5352 y Fr(\003)921 5421 y(R)981 5402 y Fm(d)981 5438 y(n)1062 5388 y Fs(t)1097 5352 y Fr(\003)1172 5388 y Fv(and)f Fs(u)p Fu(!)1517 5352 y Fr(\003)1517 5421 y(R)1577 5402 y Fm(d)1577 5438 y(n)1623 5388 y Fs(e)p Fw(\()p Fs(t)1741 5352 y Fr(\003)1781 5388 y Fw(\))p Fv(.)1828 5637 y Fw(14)p eop %%Page: 15 15 15 14 bop 257 573 a Fv(Pr)-5 b(o)g(of)67 b Fw(W)-8 b(e)33 b(use)h(induction)e(on)g Fs(n)p Fw(.)257 693 y(\(1\))h(Surjectivit)m(y) f(is)g(ob)m(vious.)257 814 y(\(2\))k(The)h Fv(if)f Fw(direction)f(is)h (easily)f(sho)m(wn.)56 b(F)-8 b(or)35 b(an)i(indirect)e(pro)s(of)g(of)h (the)g Fv(only)j(if)c Fw(di-)257 934 y(rection,)44 b(supp)s(ose)g Fs(e)p Fw(\()p Fs(t)1116 898 y Fr(\003)1155 934 y Fw(\))g Fu(62)g Fs(N)10 b(F)k Fw(\()p Fu(!)1650 953 y Fr(R)1710 934 y Fm(d)1710 970 y(n)1757 934 y Fw(\),)44 b(i.e.,)g Fs(e)p Fw(\()p Fs(t)2180 898 y Fr(\003)2220 934 y Fw(\))f(=)h Fs(C)7 b Fw([)p Fs(l)r(\033)t Fw(])p Fu(!)2742 953 y Fr(R)2802 934 y Fm(d)2802 970 y(n)2849 934 y Fs(C)g Fw([)p Fs(r)s(\033)t Fw(])42 b(b)m(y)g(using)257 1054 y(the)29 b(rule)e Fs(\032)h Fw(:)g Fs(l)h Fu(!)f Fs(r)i Fu(\()d Fs(s)1177 1069 y Fq(1)1217 1054 y Fw(==)p Fs(t)1404 1069 y Fq(1)1443 1054 y Fs(;)17 b(:)g(:)g(:)33 b(;)17 b(s)1725 1069 y Fp(k)1767 1054 y Fw(==)p Fs(t)1954 1069 y Fp(k)2024 1054 y Fw(at)28 b(p)s(osition)e Fs(p)p Fw(.)41 b(So,)29 b(for)e(ev)m(ery)j Fs(s)3225 1069 y Fp(i)3253 1054 y Fw(==)p Fs(t)3440 1069 y Fp(i)3468 1054 y Fw(,)257 1175 y(there)e(is)f(a)g(ground)g(constructor)h(term)f Fs(u)1789 1190 y Fp(i)1843 1175 y Fw(suc)m(h)i(that)e Fs(s)2310 1190 y Fp(i)2338 1175 y Fs(\033)t Fu(!)2497 1139 y Fr(\003)2497 1212 y(R)2557 1189 y Fm(d)2557 1233 y(n)p Fk(\000)p Fl(1)2682 1175 y Fs(u)2738 1190 y Fp(i)2793 1175 y Fw(and)g Fs(t)3012 1190 y Fp(i)3041 1175 y Fs(\033)t Fu(!)3200 1139 y Fr(\003)3200 1212 y(R)3260 1189 y Fm(d)3260 1233 y(n)p Fk(\000)p Fl(1)3384 1175 y Fs(u)3440 1190 y Fp(i)3468 1175 y Fw(.)257 1323 y(Let)48 b Fs(l)478 1287 y Fr(\003)565 1323 y Fw(and)f Fs(\033)828 1287 y Fr(\003)915 1323 y Fw(b)s(e)g(mark)m(ed)h(v)m (ersion)g(of)f Fs(l)i Fw(and)f Fs(\033)j Fw(suc)m(h)e(that)e Fs(t)2781 1287 y Fr(\003)2820 1323 y Fu(j)2848 1338 y Fp(p)2941 1323 y Fw(=)52 b Fs(l)3100 1287 y Fr(\003)3140 1323 y Fs(\033)3199 1287 y Fr(\003)3238 1323 y Fw(.)88 b(Let)257 1444 y Fs(l)288 1407 y Fr(\003)383 1444 y Fu(!)55 b Fs(r)585 1407 y Fr(\003)679 1444 y Fu(\()f Fs(s)879 1407 y Fr(\003)879 1468 y Fq(1)919 1444 y Fw(==)o Fs(t)1105 1407 y Fr(\003)1105 1468 y Fq(1)1145 1444 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)1426 1407 y Fr(\003)1426 1469 y Fp(k)1469 1444 y Fw(==)o Fs(t)1655 1407 y Fr(\003)1655 1469 y Fp(k)1747 1444 y Fw(b)s(e)49 b(a)f(mark)m(ed)h(v)m(ersion)g(of)f Fs(\032)h Fw(suc)m(h)h(that)e(all)257 1564 y(marks)40 b(on)g Fs(r)745 1528 y Fr(\003)784 1564 y Fw(,)i Fs(s)899 1528 y Fr(\003)899 1589 y Fp(i)938 1564 y Fw(,)g(and)e Fs(t)1239 1528 y Fr(\003)1239 1589 y Fp(i)1318 1564 y Fw(are)g(fresh)g(w.r.t.)h Fs(t)2034 1528 y Fr(\003)2113 1564 y Fw(and)f(m)m(utually)e(distinct.)65 b(F)-8 b(urther-)257 1684 y(more,)50 b Fs(\033)605 1648 y Fr(\003)691 1684 y Fw(is)c(extended)i(to)f Fu(E)9 b(V)e Fs(ar)s Fw(\()p Fs(\032)p Fw(\))47 b(in)f(the)h(usual)f(w)m(a)m(y:)73 b(for)46 b(all)e Fs(z)57 b Fu(2)51 b(E)9 b(V)f Fs(ar)s Fw(\()p Fs(\032)p Fw(\))257 1805 y(let)46 b Fs(z)t(\033)520 1769 y Fr(\003)606 1805 y Fw(b)s(e)g(a)g(mark)m(ed)g(v)m(ersion)g(of)g Fs(z)t(\033)51 b Fw(suc)m(h)c(that)f(all)e(marks)i(are)g(m)m(utually)e (dis-)257 1925 y(tinct)35 b(and)f(fresh)i(w.r.t.)f Fs(t)1220 1889 y Fr(\003)1260 1925 y Fw(,)g Fs(r)1369 1889 y Fr(\003)1408 1925 y Fw(,)p Fs(s)1481 1889 y Fr(\003)1481 1950 y Fp(i)1521 1925 y Fw(,)g(and)g Fs(t)1810 1889 y Fr(\003)1810 1950 y Fp(i)1849 1925 y Fw(.)50 b(Let)35 b Fs(C)2180 1889 y Fr(\003)2220 1925 y Fw([)p Fs(;)17 b(:)g(:)g(:)e(;)i Fw(])35 b(b)s(e)g(the)g(mark)m(ed)g(con)m(text)257 2045 y(suc)m(h)49 b(that)d Fs(t)752 2009 y Fr(\003)843 2045 y Fw(=)52 b Fs(C)1048 2009 y Fr(\003)1087 2045 y Fw([)p Fs(l)1145 2009 y Fr(\003)1185 2045 y Fs(\033)1244 2009 y Fr(\003)1284 2045 y Fs(;)17 b(:)g(:)g(:)e(;)i(l)1533 2009 y Fr(\003)1573 2045 y Fs(\033)1632 2009 y Fr(\003)1671 2045 y Fw(])47 b(and)g Fs(l)1980 2009 y Fr(\003)2019 2045 y Fs(\033)2078 2009 y Fr(\003)2165 2045 y Fw(is)f(not)g(a)h (subterm)g(of)f Fs(C)3156 2009 y Fr(\003)3195 2045 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(].)257 2166 y(Since)49 b Fs(e)p Fw(\()p Fs(s)657 2130 y Fr(\003)657 2190 y Fp(i)696 2166 y Fs(\033)755 2130 y Fr(\003)795 2166 y Fw(\))54 b(=)h Fs(s)1064 2181 y Fp(i)1092 2166 y Fs(\033)t Fu(!)1251 2130 y Fr(\003)1251 2203 y(R)1311 2180 y Fm(d)1311 2224 y(n)p Fk(\000)p Fl(1)1436 2166 y Fs(u)1492 2181 y Fp(i)1520 2166 y Fw(,)d Fs(e)p Fw(\()p Fs(t)1717 2130 y Fr(\003)1717 2190 y Fp(i)1757 2166 y Fs(\033)1816 2130 y Fr(\003)1855 2166 y Fw(\))j(=)f Fs(t)2113 2181 y Fp(i)2142 2166 y Fs(\033)t Fu(!)2301 2130 y Fr(\003)2301 2203 y(R)2361 2180 y Fm(d)2361 2224 y(n)p Fk(\000)p Fl(1)2486 2166 y Fs(u)2542 2181 y Fp(i)2569 2166 y Fw(,)f(and)48 b Fs(u)2910 2181 y Fp(i)2986 2166 y Fw(is)g(a)g(ground)257 2309 y(constructor)h (term,)i(it)c(follo)m(ws)f(from)g(the)i(inductiv)m(e)g(h)m(yp)s (othesis)h(that)e(there)i(ex-)257 2429 y(ist)44 b(mark)m(ed)h(terms)g Fs(v)1099 2393 y Fr(\003)1095 2454 y Fp(i)1182 2429 y Fw(and)g Fs(w)1457 2393 y Fr(\003)1454 2454 y Fp(i)1540 2429 y Fw(suc)m(h)h(that)e Fs(s)2041 2393 y Fr(\003)2041 2454 y Fp(i)2081 2429 y Fs(\033)2140 2393 y Fr(\003)2212 2429 y Fu(\))2312 2393 y Fr(\003)2312 2466 y(R)2372 2443 y Fm(d)2372 2487 y(n)p Fk(\000)p Fl(1)2496 2429 y Fs(v)2547 2393 y Fr(\003)2543 2454 y Fp(i)2587 2429 y Fw(,)j Fs(t)2696 2393 y Fr(\003)2696 2454 y Fp(i)2736 2429 y Fs(\033)2795 2393 y Fr(\003)2867 2429 y Fu(\))2967 2393 y Fr(\003)2967 2466 y(R)3027 2443 y Fm(d)3027 2487 y(n)p Fk(\000)p Fl(1)3152 2429 y Fs(w)3225 2393 y Fr(\003)3222 2454 y Fp(i)3264 2429 y Fw(,)g(and)257 2577 y Fs(e)p Fw(\()p Fs(v)391 2541 y Fr(\003)387 2602 y Fp(i)431 2577 y Fw(\))27 b(=)h Fs(u)656 2592 y Fp(i)711 2577 y Fw(=)g Fs(e)p Fw(\()p Fs(w)971 2541 y Fr(\003)968 2602 y Fp(i)1010 2577 y Fw(\).)40 b(The)26 b(latter)d(particularly)f(implies)g(that)i Fs(v)2662 2541 y Fr(\003)2658 2602 y Fp(i)2725 2577 y Fw(and)h Fs(w)2980 2541 y Fr(\003)2977 2602 y Fp(i)3043 2577 y Fw(are)f(ground)257 2698 y(constructor)34 b(terms)f(and)g Fs(v)1286 2662 y Fr(\003)1282 2722 y Fp(i)1353 2698 y Fu(\030)c Fs(w)1532 2662 y Fr(\003)1529 2722 y Fp(i)1571 2698 y Fw(.)44 b(Therefore,)34 b Fs(t)2146 2662 y Fr(\003)2219 2698 y Fu(\))2319 2717 y Fr(R)2379 2698 y Fm(d)2379 2734 y(n)2458 2698 y Fs(C)2535 2662 y Fr(\003)2574 2698 y Fw([)p Fs(r)2648 2662 y Fr(\003)2687 2698 y Fs(\033)2746 2662 y Fr(\003)2786 2698 y Fs(;)17 b(:)g(:)g(:)e(;)i(r)3051 2662 y Fr(\003)3090 2698 y Fs(\033)3149 2662 y Fr(\003)3189 2698 y Fw(])33 b(whic)m(h)257 2818 y(con)m(tradicts)g Fs(t)794 2782 y Fr(\003)862 2818 y Fu(2)28 b Fs(N)10 b(F)k Fw(\()32 b Fu(\))1291 2837 y Fr(R)1351 2818 y Fm(d)1351 2854 y(n)1430 2818 y Fw(\).)257 2939 y(\(3\))55 b(W)-8 b(e)55 b(pro)s(ceed)g(b)m(y)h(induction)e(on)g(the)h(length)g Fs(`)f Fw(of)g Fs(s)2565 2902 y Fr(\003)2637 2939 y Fu(\))2737 2902 y Fr(\003)2737 2972 y(R)2797 2953 y Fm(d)2797 2988 y(n)2876 2939 y Fs(t)2911 2902 y Fr(\003)2951 2939 y Fw(.)110 b(The)55 b(base)257 3080 y(case)g Fs(`)65 b Fw(=)f(0)54 b(clearly)f(holds.)108 b(Th)m(us)56 b(consider)e Fs(s)2241 3043 y Fr(\003)2313 3080 y Fu(\))2413 3043 y Fp(l)2435 3020 y Fk(\003)2470 3043 y Fp(\033)2512 3020 y Fk(\003)2413 3113 y Fr(R)2473 3094 y Fm(d)2473 3129 y(n)2586 3080 y Fs(u)2642 3043 y Fr(\003)2713 3080 y Fu(\))2813 3043 y Fp(`)2813 3113 y Fr(R)2873 3094 y Fm(d)2873 3129 y(n)2952 3080 y Fs(t)2987 3043 y Fr(\003)3027 3080 y Fw(.)108 b(Accord-)257 3220 y(ing)49 b(to)g(the)h(inductiv)m(e)g(h)m (yp)s(othesis)h(on)f Fs(`)p Fw(,)k Fs(e)p Fw(\()p Fs(u)2110 3184 y Fr(\003)2149 3220 y Fw(\))p Fu(!)2287 3184 y Fr(\003)2287 3254 y(R)2347 3235 y Fm(d)2347 3270 y(n)2393 3220 y Fs(e)p Fw(\()p Fs(t)2511 3184 y Fr(\003)2551 3220 y Fw(\).)95 b(Since)49 b Fs(s)3028 3184 y Fr(\003)3100 3220 y Fu(\))3200 3184 y Fp(l)3222 3161 y Fk(\003)3258 3184 y Fp(\033)3300 3161 y Fk(\003)3200 3254 y Fr(R)3260 3235 y Fm(d)3260 3270 y(n)3373 3220 y Fs(u)3429 3184 y Fr(\003)3468 3220 y Fw(,)257 3353 y(w)m(e)c(ha)m(v)m(e)g Fs(s)694 3317 y Fr(\003)780 3353 y Fw(=)h Fs(C)979 3317 y Fr(\003)1019 3353 y Fw([)p Fs(l)1077 3317 y Fr(\003)1117 3353 y Fs(\033)1176 3317 y Fr(\003)1215 3353 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)1465 3317 y Fr(\003)1504 3353 y Fs(\033)1563 3317 y Fr(\003)1603 3353 y Fw(],)46 b Fs(l)1734 3317 y Fr(\003)1774 3353 y Fs(\033)1833 3317 y Fr(\003)1916 3353 y Fw(is)d(not)h(a)f(subterm)h (of)f Fs(C)2892 3317 y Fr(\003)2932 3353 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(],)46 b Fs(u)3334 3317 y Fr(\003)3419 3353 y Fw(=)257 3474 y Fs(C)334 3438 y Fr(\003)374 3474 y Fw([)p Fs(r)448 3438 y Fr(\003)487 3474 y Fs(\033)546 3438 y Fr(\003)585 3474 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)851 3438 y Fr(\003)890 3474 y Fs(\033)949 3438 y Fr(\003)988 3474 y Fw(],)28 b(and,)g(for)d(ev)m(ery)j Fs(s)1721 3438 y Fr(\003)1721 3498 y Fp(i)1760 3474 y Fw(==)p Fs(t)1947 3438 y Fr(\003)1947 3498 y Fp(i)1987 3474 y Fw(,)f(there)g(are)f(mark)m (ed)g(ground)g(construc-)257 3594 y(tor)40 b(terms)g Fs(u)757 3558 y Fr(\003)757 3619 y Fp(i)837 3594 y Fw(and)g Fs(v)1085 3558 y Fr(\003)1081 3619 y Fp(i)1164 3594 y Fw(suc)m(h)i(that)e Fs(s)1657 3558 y Fr(\003)1657 3619 y Fp(i)1697 3594 y Fs(\033)1756 3558 y Fr(\003)1828 3594 y Fu(\))1928 3558 y Fr(\003)1928 3631 y(R)1988 3609 y Fm(d)1988 3653 y(n)p Fk(\000)p Fl(1)2112 3594 y Fs(u)2168 3558 y Fr(\003)2168 3619 y Fp(i)2207 3594 y Fw(,)j Fs(t)2312 3558 y Fr(\003)2312 3619 y Fp(i)2351 3594 y Fs(\033)2410 3558 y Fr(\003)2482 3594 y Fu(\))2582 3558 y Fr(\003)2582 3631 y(R)2642 3609 y Fm(d)2642 3653 y(n)p Fk(\000)p Fl(1)2767 3594 y Fs(v)2818 3558 y Fr(\003)2814 3619 y Fp(i)2857 3594 y Fw(,)g(and)d Fs(u)3180 3558 y Fr(\003)3180 3619 y Fp(i)3260 3594 y Fu(\030)h Fs(v)3429 3558 y Fr(\003)3425 3619 y Fp(i)3468 3594 y Fw(.)257 3743 y(Let)h Fs(\033)k Fw(=)41 b Fs(e)p Fw(\()p Fs(\033)801 3706 y Fr(\003)841 3743 y Fw(\),)i(i.e.,)g Fs(x\033)j Fw(=)c Fs(e)p Fw(\()p Fs(x\033)1615 3706 y Fr(\003)1655 3743 y Fw(\))f(for)f(all)f Fs(x)k Fu(2)f(D)s Fw(\()p Fs(\033)2418 3706 y Fr(\003)2457 3743 y Fw(\).)69 b(By)41 b(the)h(inductiv)m(e)f(h)m(y-)257 3863 y(p)s(othesis)29 b(on)g Fs(n)p Fw(,)h Fs(e)p Fw(\()p Fs(s)1007 3827 y Fr(\003)1007 3888 y Fp(i)1046 3863 y Fw(\))p Fs(\033)t Fu(!)1243 3827 y Fr(\003)1243 3900 y(R)1303 3877 y Fm(d)1303 3921 y(n)p Fk(\000)p Fl(1)1428 3863 y Fs(e)p Fw(\()p Fs(u)1567 3827 y Fr(\003)1567 3888 y Fp(i)1606 3863 y Fw(\))e(=)f Fs(e)p Fw(\()p Fs(v)1909 3827 y Fr(\003)1905 3888 y Fp(i)1949 3863 y Fw(\))2052 3827 y Fr(\003)2052 3900 y(R)2112 3877 y Fm(d)2112 3921 y(n)p Fk(\000)p Fl(1)2165 3863 y Fu( )32 b Fs(e)p Fw(\()p Fs(t)2415 3827 y Fr(\003)2415 3888 y Fp(i)2455 3863 y Fw(\))p Fs(\033)t Fw(.)42 b(Hence)30 b Fs(l)r(\033)t Fu(!)3097 3882 y Fr(R)3157 3863 y Fm(d)3157 3899 y(n)3204 3863 y Fs(r)s(\033)i Fw(and)257 4018 y Fs(e)p Fw(\()p Fs(s)386 3982 y Fr(\003)426 4018 y Fw(\))c Fu(!)592 3977 y Fq(+)592 4053 y Fr(R)652 4034 y Fm(d)652 4070 y(n)726 4018 y Fs(e)p Fw(\()p Fs(t)844 3982 y Fr(\003)883 4018 y Fw(\).)257 4160 y(\(4\))53 b(W)-8 b(e)54 b(use)h(induction)d(on)h (the)h(length)f Fs(`)h Fw(of)f Fs(e)p Fw(\()p Fs(s)2288 4124 y Fr(\003)2327 4160 y Fw(\))p Fu(!)2465 4124 y Fp(`)2465 4194 y Fr(R)2525 4175 y Fm(d)2525 4210 y(n)2604 4160 y Fs(u)p Fw(.)106 b(The)54 b(pro)s(of)f(is)g(il-)257 4281 y(lustrated)k(in)e(Figure)g(2.)115 b(The)57 b(case)g Fs(`)68 b Fw(=)g(0)56 b(holds)g(v)-5 b(acuously)d(.)115 b(So)56 b(w)m(e)h(con-)257 4401 y(sider)45 b Fs(e)p Fw(\()p Fs(s)632 4365 y Fr(\003)671 4401 y Fw(\))p Fu(!)809 4365 y Fp(`)809 4434 y Fr(R)869 4415 y Fm(d)869 4451 y(n)954 4401 y Fw(\026)-55 b Fs(u)p Fu(!)1104 4420 y Fr(R)1164 4401 y Fm(d)1164 4437 y(n)1210 4401 y Fs(u)p Fw(.)78 b(By)45 b(the)f(inductiv)m(e)h(h)m(yp)s(othesis)g(on)f Fs(`)p Fw(,)j(there)e(exists)g(a)259 4516 y(\026)257 4534 y Fs(t)292 4498 y Fr(\003)360 4534 y Fu(2)28 b(T)508 4549 y Fp(w)565 4534 y Fw(\()p Fu(F)685 4498 y Fr(\003)724 4534 y Fs(;)17 b Fu(V)837 4498 y Fr(\003)876 4534 y Fw(\))29 b(suc)m(h)i(that)e Fs(s)1414 4498 y Fr(\003)1486 4534 y Fu(\))1586 4498 y Fr(\003)1586 4567 y(R)1646 4548 y Fm(d)1646 4584 y(n)1726 4516 y Fw(\026)1725 4534 y Fs(t)1760 4498 y Fr(\003)1829 4534 y Fw(and)35 b(\026)-55 b Fs(u)p Fu(!)2171 4498 y Fr(\003)2171 4567 y(R)2231 4548 y Fm(d)2231 4584 y(n)2277 4534 y Fs(e)p Fw(\()2361 4516 y(\026)2360 4534 y Fs(t)2395 4498 y Fr(\003)2435 4534 y Fw(\).)42 b(Let)2715 4516 y(\026)2714 4534 y Fs(t)27 b Fw(=)h Fs(e)p Fw(\()2964 4516 y(\026)2963 4534 y Fs(t)2998 4498 y Fr(\003)3038 4534 y Fw(\).)42 b(Supp)s(ose)263 4667 y(\026)-55 b Fs(u)32 b Fw(=)f Fs(C)7 b Fw([)p Fs(l)r(\033)t Fw(])p Fu(!)773 4686 y Fr(R)833 4667 y Fm(d)833 4703 y(n)880 4667 y Fs(C)g Fw([)p Fs(r)s(\033)t Fw(])31 b(=)h Fs(u)i Fw(b)m(y)i(using)f(the)g (rule)f Fs(\032)28 b Fw(:)g Fs(l)i Fu(!)d Fs(r)k Fu(\()c Fs(s)2676 4682 y Fq(1)2715 4667 y Fw(==)p Fs(t)2902 4682 y Fq(1)2942 4667 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)3223 4682 y Fp(k)3266 4667 y Fw(==)o Fs(t)3452 4682 y Fp(k)257 4787 y Fw(at)35 b(the)h(p)s(osition)e Fs(p)p Fw(,)i(i.e.,)g Fs(C)7 b Fw([)p Fs(l)r(\033)t Fw(])p Fu(j)1474 4802 y Fp(p)1546 4787 y Fw(=)32 b Fs(l)r(\033)t Fw(.)52 b(By)36 b(the)g(parallel)c(mo)m(v)m(es)37 b(lemma)c(for)i Fu(!)3362 4806 y Fr(R)3422 4788 y Fm(d)3422 4823 y(n)3468 4787 y Fw(,)257 4908 y(there)g(is)e(a)h Fs(v)g Fu(2)c(T)c Fw(\()p Fu(F)10 b Fs(;)17 b Fu(V)8 b Fw(\))33 b(suc)m(h)i(that)f Fs(u)e Fu(k)-72 b(!)1851 4871 y Fr(\003)1851 4941 y(R)1911 4922 y Fm(d)1911 4958 y(n)1957 4908 y Fs(v)38 b Fw(and)2234 4889 y(\026)2233 4908 y Fs(t)33 b Fu(k)-72 b(!)2379 4927 y Fr(R)2439 4908 y Fm(d)2439 4943 y(n)2485 4908 y Fs(v)t Fw(.)47 b(In)34 b(particular,)f(the)h(re-)257 5041 y(dexes)h(con)m (tracted)f(in)e(the)h(step)1491 5022 y(\026)1490 5041 y Fs(t)g Fu(k)-72 b(!)1636 5060 y Fr(R)1696 5041 y Fm(d)1696 5076 y(n)1742 5041 y Fs(v)36 b Fw(are)d(the)g(descendan)m(ts)j Fs(p)p Fu(n)6 b Fw(\026)-55 b Fs(u)o Fu(!)2951 5004 y Fr(\003)2951 5074 y(R)3011 5055 y Fm(d)3011 5090 y(n)3059 5022 y Fw(\026)3058 5041 y Fs(t)33 b Fw(of)f Fs(p)h Fw(in)3434 5022 y(\026)3433 5041 y Fs(t)p Fw(.)257 5173 y(Let)j Fs(Q)d Fw(=)f Fs(p)p Fu(n)6 b Fw(\026)-55 b Fs(u)o Fu(!)907 5137 y Fr(\003)907 5207 y(R)967 5188 y Fm(d)967 5223 y(n)1015 5155 y Fw(\026)1014 5173 y Fs(t)p Fw(.)52 b(Note)35 b(that)g Fs(Q)e Fu(\022)g(P)8 b Fs(os)p Fw(\()2009 5155 y(\026)2008 5173 y Fs(t)p Fw(\))35 b(consists)h(of)f(pairwise)g(indep)s (enden)m(t)257 5306 y(p)s(ositions.)53 b(F)-8 b(or)36 b(ev)m(ery)i Fs(q)f Fu(2)d Fs(Q)p Fw(,)1479 5288 y(\026)1478 5306 y Fs(t)1513 5270 y Fr(\003)1552 5306 y Fu(j)1580 5321 y Fp(q)1654 5306 y Fw(can)j(b)s(e)f(written)g(as)2443 5288 y(\026)2441 5306 y Fs(t)2476 5270 y Fr(\003)2516 5306 y Fu(j)2544 5321 y Fp(q)2615 5306 y Fw(=)e Fs(l)2756 5270 y Fr(\003)2754 5331 y Fp(q)2796 5306 y Fs(\034)2849 5270 y Fr(\003)2838 5331 y Fp(q)2889 5306 y Fw(,)j(where)g Fs(l)3269 5270 y Fr(\003)3267 5331 y Fp(q)3345 5306 y Fw(is)e(a)1828 5637 y(15)p eop %%Page: 16 16 16 15 bop 894 665 a Fs(e)p Fw(\()p Fs(s)1023 629 y Fr(\003)1062 665 y Fw(\))83 b Fu(\000)-16 b(!)1344 629 y Fp(`)1344 699 y Fr(R)1404 680 y Fm(d)1404 715 y(n)1610 665 y Fw(\026)-55 b Fs(u)153 b Fu(\000)-16 b(!)1974 685 y Fr(R)2034 666 y Fm(d)2034 701 y(n)2168 665 y Fs(u)1563 821 y Fr(\003)1599 715 y Ft(?)1599 775 y(?)1599 835 y(y)1665 826 y Fr(R)1725 802 y Fm(d)1725 842 y(n)2128 821 y Fr(\003)2163 715 y Ft(?)2163 775 y(?)2163 835 y(y)2229 826 y Fr(R)2289 802 y Fm(d)2289 842 y(n)1534 979 y Fs(e)p Fw(\()1618 961 y(\026)1617 979 y Fs(t)1652 943 y Fr(\003)1692 979 y Fw(\))83 b Fu(\000)-16 b(!)1974 943 y Fr(\003)1974 1012 y(R)2034 993 y Fm(d)2034 1029 y(n)2171 979 y Fs(v)94 b Fu(\000)-16 b(!)2473 943 y Fr(\003)2473 1012 y(R)2533 993 y Fm(d)2533 1029 y(n)2663 979 y Fs(e)p Fw(\()p Fs(t)2781 943 y Fr(\003)2821 979 y Fw(\))955 1233 y Fs(s)1001 1197 y Fr(\003)1184 1233 y Fw(=)f Fu(\))1343 1197 y Fr(\003)1343 1267 y(R)1403 1248 y Fm(d)1403 1283 y(n)1596 1215 y Fw(\026)1594 1233 y Fs(t)1629 1197 y Fr(\003)1813 1233 y Fw(=)g Fu(\))1972 1197 y Fr(\003)1972 1267 y(R)2032 1248 y Fm(d)2032 1283 y(n)2723 1233 y Fs(t)2758 1197 y Fr(\003)1192 1477 y Fw(Figure)32 b(2:)43 b(Pro)s(of)32 b(of)g(Theorem)h(4.4.)257 1753 y(mark)m(ed)h(v)m(ersion)h(of)e Fs(l)j Fw(and)e Fs(\034)1359 1717 y Fr(\003)1348 1777 y Fp(q)1432 1753 y Fw(is)f(a)h(mark)m(ed)g(substitution.)46 b(As)34 b(in)f(the)h(pro)s (of)f(of)g(\(2\),)257 1873 y(one)g(can)g(sho)m(w)h(that)e Fs(l)1099 1837 y Fr(\003)1097 1898 y Fp(q)1139 1873 y Fs(\034)1192 1837 y Fr(\003)1181 1898 y Fp(q)1264 1873 y Fu(\))1364 1892 y Fr(R)1424 1873 y Fm(d)1424 1909 y(n)1503 1873 y Fs(r)1550 1837 y Fr(\003)1589 1873 y Fs(\034)1642 1837 y Fr(\003)1631 1898 y Fp(q)1682 1873 y Fw(.)44 b(Let)830 2077 y Fs(Q)907 2036 y Fr(0)958 2077 y Fw(=)27 b Fu(f)p Fs(q)1158 2036 y Fr(0)1209 2077 y Fu(2)h(P)8 b Fs(os)p Fw(\()1512 2059 y(\026)1511 2077 y Fs(t)1546 2041 y Fr(\003)1586 2077 y Fw(\))32 b Fu(j)1718 2059 y Fw(\026)1717 2077 y Fs(t)1752 2036 y Fr(\003)1791 2077 y Fu(j)1819 2092 y Fp(q)1853 2073 y Fk(0)1907 2077 y Fw(=)c Fs(l)2042 2036 y Fr(\003)2040 2102 y Fp(q)2081 2077 y Fs(\034)2134 2036 y Fr(\003)2123 2102 y Fp(q)2207 2077 y Fw(for)k(some)g Fs(q)g Fu(2)c Fs(Q)p Fu(g)p Fs(:)257 2282 y Fw(Note)40 b(that)g Fs(Q)g Fu(\022)g Fs(Q)1030 2246 y Fr(0)1053 2282 y Fw(.)65 b(It)40 b(is)f(not)h(di\016cult)e(to)i(pro)m(v)m(e)h (that)e Fs(Q)2600 2246 y Fr(0)2663 2282 y Fw(consists)i(of)e(pairwise) 257 2402 y(indep)s(enden)m(t)d(p)s(ositions.)46 b(Let)35 b Fs(t)1476 2366 y Fr(\003)1549 2402 y Fw(b)s(e)g(the)f(mark)m(ed)h (term)e(obtained)h(from)3072 2384 y(\026)3071 2402 y Fs(t)3106 2366 y Fr(\003)3179 2402 y Fw(b)m(y)h(con-)257 2522 y(tracting)j(all)f(the)j(redexes)h Fs(l)1331 2486 y Fr(\003)1329 2547 y Fp(q)1370 2522 y Fs(\034)1423 2486 y Fr(\003)1412 2547 y Fp(q)1463 2522 y Fw(.)63 b(Let)39 b Fs(\034)1776 2537 y Fp(q)1853 2522 y Fw(=)f Fs(e)p Fw(\()p Fs(\034)2103 2486 y Fr(\003)2092 2547 y Fp(q)2143 2522 y Fw(\).)63 b(Since)2533 2504 y(\026)2532 2522 y Fs(t)33 b Fu(k)-72 b(!)2678 2542 y Fr(R)2738 2523 y Fm(d)2738 2558 y(n)2784 2522 y Fs(v)43 b Fw(b)m(y)d(con)m(tracting)257 2643 y(the)34 b(redexes)i(in)d Fs(Q)g Fw(and)1189 2624 y(\026)1188 2643 y Fs(t)g Fu(k)-72 b(!)1334 2662 y Fr(R)1394 2643 y Fm(d)1394 2679 y(n)1440 2643 y Fs(e)p Fw(\()p Fs(t)1558 2607 y Fr(\003)1598 2643 y Fw(\))33 b(b)m(y)h(con)m(tracting) g(the)f(redexes)j(in)d Fs(Q)3025 2607 y Fr(0)3048 2643 y Fw(,)h(it)e(follo)m(ws)257 2763 y(that)k Fs(v)g Fu(k)-72 b(!)633 2782 y Fr(R)693 2764 y Fm(d)693 2799 y(n)740 2763 y Fs(e)p Fw(\()p Fs(t)858 2727 y Fr(\003)897 2763 y Fw(\))36 b(b)m(y)h(con)m(tracting)e(the)h(redexes)i(in)d Fs(Q)2338 2727 y Fr(0)2386 2763 y Fu(n)24 b Fs(Q)p Fw(.)53 b(All)34 b(in)h(all,)g Fs(s)3110 2727 y Fr(\003)3182 2763 y Fu(\))3282 2727 y Fr(\003)3282 2797 y(R)3342 2778 y Fm(d)3342 2813 y(n)3421 2763 y Fs(t)3456 2727 y Fr(\003)257 2896 y Fw(and)e Fs(u)p Fu(!)603 2860 y Fr(\003)603 2929 y(R)663 2911 y Fm(d)663 2946 y(n)709 2896 y Fs(e)p Fw(\()p Fs(t)827 2860 y Fr(\003)867 2896 y Fw(\).)2486 b Fj(\003)257 3107 y Fo(Corollary)36 b(4.5)49 b Fv(F)-7 b(or)24 b(al)5 b(l)25 b Fs(n)j Fu(2)g Fi(N)9 b Fv(,)67 b Fu(\))1692 3122 y Fr(R)1752 3130 y Fm(n)1859 3107 y Fv(is)24 b(an)h(ade)-5 b(quate)25 b(implementation)e(of)i Fu(!)3359 3122 y Fr(R)3419 3130 y Fm(n)3465 3107 y Fv(.)257 3317 y(Pr)-5 b(o)g(of)75 b Fw(One)37 b(can)g(pro)m(v)m(e)h(statemen)m(ts)g(\(1\)-\(3\))d(as)i (in)f(Theorem)h(4.4.)55 b(Statemen)m(t)37 b(\(4\))257 3437 y(remains)25 b(to)g(b)s(e)h(sho)m(wn:)41 b(for)25 b Fs(s)1370 3401 y Fr(\003)1437 3437 y Fu(2)j(T)1585 3452 y Fp(w)1642 3437 y Fw(\()p Fu(F)1762 3401 y Fr(\003)1801 3437 y Fs(;)17 b Fu(V)1914 3401 y Fr(\003)1953 3437 y Fw(\))26 b(and)f Fs(u)j Fu(2)g(T)d Fw(\()p Fu(F)10 b Fs(;)17 b Fu(V)8 b Fw(\))25 b(with)g Fs(e)p Fw(\()p Fs(s)3096 3401 y Fr(\003)3136 3437 y Fw(\))p Fu(!)3274 3401 y Fr(\003)3274 3463 y(R)3334 3471 y Fm(n)3413 3437 y Fs(u)p Fw(,)257 3558 y(there)34 b(m)m(ust)e(b)s(e)h(a)f Fs(t)997 3522 y Fr(\003)1065 3558 y Fu(2)c(T)1213 3573 y Fp(w)1270 3558 y Fw(\()p Fu(F)1390 3522 y Fr(\003)1429 3558 y Fs(;)17 b Fu(V)1542 3522 y Fr(\003)1581 3558 y Fw(\))32 b(suc)m(h)i(that)f Fs(s)2129 3522 y Fr(\003)2201 3558 y Fu(\))2301 3522 y Fr(\003)2301 3583 y(R)2361 3591 y Fm(n)2440 3558 y Fs(t)2475 3522 y Fr(\003)2547 3558 y Fw(and)g Fs(u)p Fu(!)2893 3522 y Fr(\003)2893 3583 y(R)2953 3591 y Fm(n)3031 3558 y Fs(e)p Fw(\()p Fs(t)3149 3522 y Fr(\003)3189 3558 y Fw(\).)404 3678 y(By)i(Prop)s(osition)e(3.10,)i(there)g(is)f(a)h (term)f Fs(v)k Fw(suc)m(h)e(that)f Fs(e)p Fw(\()p Fs(s)2642 3642 y Fr(\003)2681 3678 y Fw(\))p Fu(!)2819 3642 y Fr(\003)2819 3711 y(R)2879 3692 y Fm(d)2879 3728 y(n)2926 3678 y Fs(v)3009 3642 y Fr(\003)3009 3711 y(R)3069 3692 y Fm(d)3069 3728 y(n)3110 3678 y Fu( )d Fs(u)p Fw(.)50 b(By)257 3811 y(Theorem)30 b(4.4,)g(there)f(is)g(a)g(mark)m(ed)h(term)e Fs(t)1874 3775 y Fr(\003)1943 3811 y Fw(suc)m(h)j(that)e Fs(s)2414 3775 y Fr(\003)2486 3811 y Fu(\))2586 3775 y Fr(\003)2586 3844 y(R)2646 3825 y Fm(d)2646 3861 y(n)2725 3811 y Fs(t)2760 3775 y Fr(\003)2829 3811 y Fw(and)g Fs(v)t Fu(!)3166 3775 y Fr(\003)3166 3844 y(R)3226 3825 y Fm(d)3226 3861 y(n)3272 3811 y Fs(e)p Fw(\()p Fs(t)3390 3775 y Fr(\003)3430 3811 y Fw(\).)257 3944 y(No)m(w)40 b(the)f(claim)d(is)i(a)h (consequence)i(of)71 b Fu(\))1924 3963 y Fr(R)1984 3944 y Fm(d)1984 3980 y(n)2101 3944 y Fu(\022)g(\))2349 3959 y Fr(R)2409 3967 y Fm(n)2488 3944 y Fw(,)41 b Fs(u)p Fu(!)2712 3908 y Fr(\003)2712 3977 y(R)2772 3958 y Fm(d)2772 3994 y(n)2818 3944 y Fs(v)t Fu(!)2969 3908 y Fr(\003)2969 3977 y(R)3029 3958 y Fm(d)3029 3994 y(n)3075 3944 y Fs(e)p Fw(\()p Fs(t)3193 3908 y Fr(\003)3233 3944 y Fw(\),)f(and)257 4064 y Fu(!)357 4084 y Fr(R)417 4065 y Fm(d)417 4100 y(n)492 4064 y Fu(\022)28 b(!)697 4079 y Fr(R)757 4087 y Fm(n)803 4064 y Fw(.)2588 b Fj(\003)257 4275 y Fo(Corollary)36 b(4.6)84 b Fu(\))1082 4290 y Fr(R)1216 4275 y Fv(is)34 b(an)h(ade)-5 b(quate)34 b(implementation)g(of)g Fu(!)2765 4290 y Fr(R)2829 4275 y Fv(.)257 4485 y(Pr)-5 b(o)g(of)67 b Fw(Immediate)32 b(consequence)j(of)d(Corollary)f(4.5.)1137 b Fj(\003)404 4696 y Fw(It)22 b(is)g(a)h(direct)f(consequence)k(of)c (the)h(preceding)g(results)g(that)54 b Fu(\))2787 4711 y Fr(R)2906 4696 y Fw(is)22 b(a)h(sound)g(and)257 4817 y(complete)31 b(implemen)m(tation)d(of)j Fu(!)1573 4832 y Fr(R)1668 4817 y Fw(in)g(the)h(sense)h(of)e(Barendregt)h(et)f(al.)g ([4].)43 b(Recall)257 4937 y(that)f(soundness)j(ensures)f(that)e(the)g (graph)g(implemen)m(tation)d(of)j(a)g(CTRS)h(cannot)257 5057 y(giv)m(e)33 b(incorrect)f(results,)h(while)f(completeness)h (ensures)h(that)e(graph)h(rewriting)e(giv)m(es)257 5178 y(all)g(results.)257 5388 y Fo(Corollary)36 b(4.7)84 b Fu(\))1082 5403 y Fr(R)1216 5388 y Fv(is)34 b(a)h(sound)g(and)f(c)-5 b(omplete)34 b(implementation)f(of)i Fu(!)3184 5403 y Fr(R)3248 5388 y Fv(,)g(i.e.,)1828 5637 y Fw(16)p eop %%Page: 17 17 17 16 bop 373 573 a Fv(1.)48 b Fs(s)547 537 y Fr(\003)621 573 y Fu(\))721 537 y Fr(\003)721 598 y(R)820 573 y Fs(t)855 537 y Fr(\003)950 573 y Fu(2)54 b Fs(N)10 b(F)k Fw(\()36 b Fu(\))1409 588 y Fr(R)1507 573 y Fw(\))50 b Fv(implies)e Fs(e)p Fw(\()p Fs(s)2072 537 y Fr(\003)2111 573 y Fw(\))p Fu(!)2249 537 y Fr(\003)2249 598 y(R)2348 573 y Fs(e)p Fw(\()p Fs(t)2466 537 y Fr(\003)2506 573 y Fw(\))55 b Fu(2)f Fs(N)10 b(F)k Fw(\()p Fu(!)3022 588 y Fr(R)3087 573 y Fw(\))49 b Fv(\(sound-)501 693 y(ness\),)373 894 y(2.)f Fu(8)p Fs(s)602 858 y Fr(\003)681 894 y Fu(2)39 b(T)840 909 y Fp(w)897 894 y Fw(\()p Fu(F)1017 858 y Fr(\003)1056 894 y Fs(;)17 b Fu(V)1169 858 y Fr(\003)1208 894 y Fw(\))p Fv(:)57 b(if)41 b Fs(e)p Fw(\()p Fs(s)1563 858 y Fr(\003)1603 894 y Fw(\))p Fu(!)1741 858 y Fr(\003)1741 919 y(R)1839 894 y Fs(u)e Fu(2)g Fs(N)10 b(F)k Fw(\()p Fu(!)2342 909 y Fr(R)2407 894 y Fw(\))p Fv(,)42 b(then)f(ther)-5 b(e)41 b(is)f(a)h(marke)-5 b(d)501 1014 y(term)27 b Fs(t)761 978 y Fr(\003)828 1014 y Fv(such)f(that)h Fs(s)1278 978 y Fr(\003)1353 1014 y Fu(\))1453 978 y Fr(\003)1453 1039 y(R)1552 1014 y Fs(t)1587 978 y Fr(\003)1654 1014 y Fu(2)h Fs(N)10 b(F)k Fw(\()35 b Fu(\))2086 1029 y Fr(R)2185 1014 y Fw(\))27 b Fv(and)f Fs(e)p Fw(\()p Fs(t)2549 978 y Fr(\003)2589 1014 y Fw(\))h(=)h Fs(u)e Fv(\(c)-5 b(ompleteness\).)257 1231 y(Pr)g(o)g(of)67 b Fw(F)-8 b(ollo)m(ws)32 b(directly)f(from)h (Corollary)f(4.6.)1352 b Fj(\003)404 1445 y Fw(Note)39 b(that)g(in)g(the)h(en)m(tire)f(subsection,)k(there)d(is)f(only)f(one)i (place)f(at)g(whic)m(h)h(w)m(e)257 1565 y(made)i(use)i(of)d(the)i(fact) f(that)g Fu(R)h Fw(is)f(orthogonal:)61 b(Theorem)43 b(4.4)f(\(4\))g (crucially)e(de-)257 1686 y(p)s(ends)e(on)e(the)h(fact)g(that)f(the)h (parallel)d(mo)m(v)m(es)k(lemma)c(holds)i(for)g Fu(!)2912 1705 y Fr(R)2972 1686 y Fm(d)2972 1721 y(n)3019 1686 y Fw(.)55 b(Since)37 b(the)257 1806 y(parallel)f(mo)m(v)m(es)k(lemma)d (remains)h(v)-5 b(alid)37 b(if)h Fu(R)h Fw(is)f(almost)f(orthogonal,)i (so)g(do)g(all)e(of)257 1926 y(the)c(preceding)g(results)g(if)f(w)m(e)h (replace)g(orthogonalit)m(y)e(with)h(almost)f(orthogonalit)m(y)-8 b(.)404 2047 y(W)g(e)40 b(conclude)g(this)g(subsection)h(b)m(y)f(sho)m (wing)h(wh)m(y)g(w)m(e)g(need)g Fs(u)2842 2011 y Fr(\003)2842 2071 y Fp(i)2921 2047 y Fu(\030)f Fs(v)3089 2011 y Fr(\003)3085 2071 y Fp(i)3168 2047 y Fw(but)g(not)257 2167 y Fs(u)313 2131 y Fr(\003)313 2192 y Fp(i)380 2139 y Fu(\030)381 2171 y Fw(=)485 2167 y Fs(v)536 2131 y Fr(\003)532 2192 y Fp(i)608 2167 y Fw(in)32 b(De\014nition)f(4.2.)257 2384 y Fo(Example)37 b(4.8)49 b Fw(In)33 b(the)g(CTRS)943 2646 y Fu(R)28 b Fw(=)1159 2505 y Ft(\032)1275 2585 y Fs(g)t Fw(\()p Fs(x)p Fw(\))91 b Fu(!)28 b Fs(c)p Fw(\()p Fs(x;)17 b(x)p Fw(\))1275 2705 y Fs(f)11 b Fw(\()p Fs(x)p Fw(\))83 b Fu(!)28 b Fs(x)300 b Fu(\()27 b Fs(g)t Fw(\()p Fs(x)p Fw(\))h Fu(!)f Fs(c)p Fw(\()p Fs(d;)17 b(d)p Fw(\))257 2918 y Fs(f)316 2882 y Fq(0)356 2918 y Fw(\()p Fs(d)445 2882 y Fq(1)484 2918 y Fw(\))64 b(rewrites)g(to)g Fs(d)1188 2882 y Fq(1)1291 2918 y Fw(b)s(ecause)i Fs(g)1735 2882 y Fq(2)1774 2918 y Fw(\()p Fs(d)1863 2882 y Fq(1)1902 2918 y Fw(\))32 b Fu(\))2072 2933 y Fr(R)2169 2918 y Fs(c)2211 2882 y Fq(3)2250 2918 y Fw(\()p Fs(d)2339 2882 y Fq(1)2378 2918 y Fs(;)17 b(d)2473 2882 y Fq(1)2512 2918 y Fw(\))64 b(and)h Fs(e)p Fw(\()p Fs(c)2961 2882 y Fq(3)3000 2918 y Fw(\()p Fs(d)3089 2882 y Fq(1)3128 2918 y Fs(;)17 b(d)3223 2882 y Fq(1)3262 2918 y Fw(\)\))81 b(=)257 3038 y Fs(c)p Fw(\()p Fs(d;)17 b(d)p Fw(\))37 b(=)g Fs(e)p Fw(\()p Fs(c)796 3002 y Fq(4)836 3038 y Fw(\()p Fs(d)925 3002 y Fq(5)964 3038 y Fs(;)17 b(d)1059 3002 y Fq(6)1098 3038 y Fw(\)\).)60 b(If)39 b Fs(c)1407 3002 y Fq(3)1446 3038 y Fw(\()p Fs(d)1535 3002 y Fq(1)1574 3038 y Fs(;)17 b(d)1669 3002 y Fq(1)1708 3038 y Fw(\)\))1821 3011 y Fu(\030)1822 3043 y Fw(=)1936 3038 y Fs(c)1978 3002 y Fq(4)2018 3038 y Fw(\()p Fs(d)2107 3002 y Fq(5)2146 3038 y Fs(;)g(d)2241 3002 y Fq(6)2280 3038 y Fw(\))38 b(w)m(ere)i(required,)g(then)f Fs(f)3290 3002 y Fq(0)3329 3038 y Fw(\()p Fs(d)3418 3002 y Fq(1)3457 3038 y Fw(\))257 3159 y(w)m(ould)33 b(b)s(e)g(a)g(normal)e(form)g(w.r.t.)66 b Fu(\))1711 3174 y Fr(R)1808 3159 y Fw(.)44 b(Since)33 b Fs(f)11 b Fw(\()p Fs(d)p Fw(\))32 b(is)h(not)f(a)h(normal)e(form)h (w.r.t.)257 3279 y Fu(!)357 3294 y Fr(R)421 3279 y Fw(,)d(graph)e (rewriting)f(w)m(ouldn't)i(b)s(e)g(an)f(adequate)h(implemen)m(tation)d (of)i(conditional)257 3400 y(term)32 b(rewriting.)257 3687 y Fa(4.2)136 b(Con\015uence)257 3872 y Fw(In)43 b(this)f(subsection,)k(it)c(will)e(b)s(e)i(sho)m(wn)i(that)e (orthogonal)f(conditional)f(rules)i(giv)m(e)257 3992 y(rise)29 b(to)f(a)h(sub)s(comm)m(utativ)m(e)f(deterministic)f(graph)i (rewrite)g(relation)e(\(up)i(to)f(isomor-)257 4112 y(phism\).)40 b(This)24 b(implies)e(that)h(the)i(graph)e(rewrite)h(relation)e(is)i (lev)m(el-con\015uen)m(t)g(mo)s(dulo)257 4205 y Fu(\030)258 4237 y Fw(=)335 4233 y(.)63 b(Similar)36 b(results)j(for)g (unconditional)e(systems)j(w)m(ere)h(ac)m(hiev)m(ed)f(b)m(y)g(Staples)f ([19])257 4353 y(and)32 b(Barendregt)h(et)f(al.)e([4].)44 b(In)32 b(order)g(to)f(pro)m(v)m(e)i(the)g(ab)s(o)m(v)m(e-men)m(tioned) f(statemen)m(t,)257 4473 y(the)h(follo)m(wing)d(auxiliary)h(result)h (is)g(useful.)257 4690 y Fo(Lemma)37 b(4.9)49 b Fv(L)-5 b(et)46 b Fu(\))1125 4705 y Fp(n)1216 4690 y Fv(denote)79 b Fu(\))1672 4709 y Fr(R)1732 4690 y Fm(d)1732 4726 y(n)1858 4690 y Fv(or)h Fu(\))2129 4705 y Fr(R)2189 4713 y Fm(n)2270 4690 y Fv(.)74 b(If)44 b Fs(s)2532 4654 y Fr(\003)2618 4662 y Fu(\030)2619 4694 y Fw(=)2741 4690 y Fs(t)2776 4654 y Fr(\003)2862 4690 y Fu(\))2962 4654 y Fp(`)2962 4715 y(n)3054 4690 y Fs(u)3110 4654 y Fr(\003)3194 4690 y Fv(\(so)g(the)257 4810 y(r)-5 b(e)g(duction)30 b(of)g Fs(t)822 4774 y Fr(\003)892 4810 y Fv(to)h Fs(u)1061 4774 y Fr(\003)1130 4810 y Fv(c)-5 b(onsists)29 b(of)h Fs(`)g Fv(gr)-5 b(aph)30 b(r)-5 b(ewrite)30 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Fs(mar)s(k)s(s)p Fw(\()p Fs(u)1314 5352 y Fr(\003)1353 5388 y Fw(\))33 b(suc)m(h)h(that)e(\010\()p Fs(t)1998 5352 y Fr(\003)2038 5388 y Fw(\))c(=)f Fs(s)2253 5352 y Fr(\003)2321 5388 y Fu(\))2421 5352 y Fp(`)2421 5413 y(n)2495 5388 y Fw(\010\()p Fs(u)2659 5352 y Fr(\003)2698 5388 y Fw(\))2764 5360 y Fu(\030)2765 5392 y Fw(=)2869 5388 y Fs(u)2925 5352 y Fr(\003)2964 5388 y Fw(.)1828 5637 y(17)p eop %%Page: 18 18 18 17 bop 404 573 a Fw(The)35 b(claim)e(ob)m(viously)h(holds)h(for)f Fs(`)e Fw(=)f(0.)50 b(W)-8 b(e)35 b(sho)m(w)h(the)f(lemma)e(for)h Fs(`)d Fw(=)h(1,)j(the)257 693 y(whole)22 b(claim)e(then)j(follo)m(ws)e (b)m(y)i(induction)f(on)g(the)h(length)f(of)f(the)i(reduction)f (sequence.)257 814 y(W)-8 b(e)28 b(pro)s(ceed)g(further)g(b)m(y)g (induction)f(on)g(the)h(depth)g Fs(n)p Fw(.)42 b(Supp)s(ose)28 b Fs(t)2760 777 y Fr(\003)2828 814 y Fu(\))2928 777 y Fp(l)2950 754 y Fk(\003)2985 777 y Fp(\033)3027 754 y Fk(\003)2928 838 y Fp(n)3096 814 y Fs(u)3152 777 y Fr(\003)3190 814 y Fw(,)h(where)257 934 y(a)k(mark)m(ed)g(v)m(ersion)h(of)f(the)g (rule)g Fs(\032)28 b Fw(:)f Fs(l)j Fu(!)e Fs(r)i Fu(\()d Fs(s)2060 949 y Fq(1)2100 934 y Fw(==)o Fs(t)2286 949 y Fq(1)2326 934 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)2607 949 y Fp(k)2650 934 y Fw(==)p Fs(t)2837 949 y Fp(k)2912 934 y Fw(is)33 b(used.)46 b(Then)257 1054 y(for)f(ev)m(ery)h(1)j Fu(\024)g Fs(i)g Fu(\024)g Fs(k)s Fw(,)f(there)d(are)g(mark)m(ed)g (ground)g(constructor)h(terms)e Fs(u)3254 1018 y Fr(\003)3254 1079 y Fp(i)3338 1054 y Fw(and)257 1175 y Fs(v)308 1139 y Fr(\003)304 1199 y Fp(i)391 1175 y Fw(suc)m(h)h(that)f Fs(s)891 1139 y Fr(\003)891 1199 y Fp(i)930 1175 y Fs(\033)989 1139 y Fr(\003)1075 1175 y Fu(\))1175 1139 y Fr(\003)1175 1199 y Fp(n)p Fr(\000)p Fq(1)1358 1175 y Fs(u)1414 1139 y Fr(\003)1414 1199 y Fp(i)1453 1175 y Fw(,)i Fs(t)1561 1139 y Fr(\003)1561 1199 y Fp(i)1601 1175 y Fs(\033)1660 1139 y Fr(\003)1746 1175 y Fu(\))1846 1139 y Fr(\003)1846 1199 y Fp(n)p Fr(\000)p Fq(1)2029 1175 y Fs(v)2080 1139 y Fr(\003)2076 1199 y Fp(i)2119 1175 y Fw(,)h(and)d Fs(u)2450 1139 y Fr(\003)2450 1199 y Fp(i)2535 1175 y Fu(\030)j Fs(v)2710 1139 y Fr(\003)2706 1199 y Fp(i)2749 1175 y Fw(.)77 b(Let)44 b Fs(M)3133 1190 y Fq(1)3216 1175 y Fw(b)s(e)g(the)257 1295 y(set)h(of)e(all)f(fresh)i(marks)g(used)g(in)f Fs(r)1644 1259 y Fr(\003)1641 1320 y Fq(1)1727 1295 y Fw(and)h(in)f(the)h(sequences)j Fs(s)2732 1259 y Fr(\003)2732 1320 y Fp(i)2771 1295 y Fs(\033)2830 1259 y Fr(\003)2916 1295 y Fu(\))3016 1259 y Fr(\003)3016 1320 y Fp(n)p Fr(\000)p Fq(1)3199 1295 y Fs(u)3255 1259 y Fr(\003)3255 1320 y Fp(i)3338 1295 y Fw(and)257 1416 y Fs(t)292 1379 y Fr(\003)292 1440 y Fp(i)332 1416 y Fs(\033)391 1379 y Fr(\003)467 1416 y Fu(\))567 1379 y Fr(\003)567 1440 y Fp(n)p Fr(\000)p Fq(1)740 1416 y Fs(v)791 1379 y Fr(\003)787 1440 y Fp(i)830 1416 y Fw(,)39 b(1)d Fu(\024)g Fs(i)h Fu(\024)f Fs(k)s Fw(.)59 b(Moreo)m(v)m(er,)40 b(let)d Fs(M)2118 1431 y Fq(2)2195 1416 y Fw(b)s(e)h(a)g(set)g(of)f(\(fresh\))h(marks)g(with)257 1536 y Fs(M)351 1551 y Fq(2)415 1536 y Fu(\\)25 b Fw(\()p Fs(M)638 1551 y Fq(1)702 1536 y Fu([)f Fs(mar)s(k)s(s)p Fw(\()p Fs(s)1159 1500 y Fr(\003)1199 1536 y Fw(\))g Fu([)g Fs(mar)s(k)s(s)p Fw(\()p Fs(t)1707 1500 y Fr(\003)1747 1536 y Fw(\)\))32 b(=)h Fu(;)i Fw(and)g Fs(car)s(d)p Fw(\()p Fs(M)2564 1551 y Fq(2)2604 1536 y Fw(\))d(=)h Fs(car)s(d)p Fw(\()p Fs(M)3106 1551 y Fq(1)3145 1536 y Fw(\),)j(where)257 1656 y Fs(car)s(d)p Fw(\()p Fs(M)580 1671 y Fp(i)608 1656 y Fw(\))f(denotes)i(the)e(cardinalit)m(y)e(of)i Fs(M)1905 1671 y Fp(i)1934 1656 y Fw(.)51 b(Let)35 b(\010)2259 1620 y Fr(0)2315 1656 y Fw(:)d Fs(M)2468 1671 y Fq(1)2539 1656 y Fu(!)g Fs(M)2765 1671 y Fq(2)2840 1656 y Fw(b)s(e)j(an)g (arbitrary)257 1777 y(bijectiv)m(e)e(function.)43 b(No)m(w)33 b(w)m(e)h(extend)g(\010)f(from)e Fs(mar)s(k)s(s)p Fw(\()p Fs(t)2437 1741 y Fr(\003)2477 1777 y Fw(\))h(to)g Fs(M)2760 1792 y Fq(1)2822 1777 y Fu([)23 b Fs(mar)s(k)s(s)p Fw(\()p Fs(t)3267 1741 y Fr(\003)3307 1777 y Fw(\))32 b(b)m(y)1362 1988 y(\010\()p Fs(\026)p Fw(\))c(=)g(\010)1769 1947 y Fr(0)1792 1988 y Fw(\()p Fs(\026)p Fw(\))k(if)g Fs(\026)27 b Fu(2)h Fs(M)2323 2003 y Fq(1)2363 1988 y Fs(:)257 2200 y Fw(Note)23 b(that)f(\010)28 b(:)f Fs(M)930 2215 y Fq(1)971 2200 y Fu([)q Fs(mar)s(k)s(s)p Fw(\()p Fs(t)1394 2164 y Fr(\003)1434 2200 y Fw(\))h Fu(!)f Fs(M)1721 2215 y Fq(2)1762 2200 y Fu([)q Fs(mar)s(k)s(s)p Fw(\()p Fs(s)2196 2164 y Fr(\003)2235 2200 y Fw(\))22 b(is)g(bijectiv)m(e.)40 b(By)22 b(the)h(inductiv)m(e)257 2321 y(h)m(yp)s(othesis)49 b(on)f Fs(n)p Fw(,)j(w)m(e)e(ha)m(v)m(e)g(\010\()p Fs(s)1593 2285 y Fr(\003)1593 2345 y Fp(i)1633 2321 y Fs(\033)1692 2285 y Fr(\003)1731 2321 y Fw(\))54 b Fu(\))1923 2285 y Fr(\003)1923 2345 y Fp(n)p Fr(\000)p Fq(1)2113 2321 y Fw(\010\()p Fs(u)2277 2285 y Fr(\003)2277 2345 y Fp(i)2316 2321 y Fw(\))2407 2293 y Fu(\030)2408 2325 y Fw(=)2538 2321 y Fs(u)2594 2285 y Fr(\003)2594 2345 y Fp(i)2681 2321 y Fw(and)48 b(\010\()p Fs(t)3029 2285 y Fr(\003)3029 2345 y Fp(i)3069 2321 y 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2534 y Fu(\030)2076 2566 y Fw(=)2183 2561 y Fs(u)2239 2525 y Fr(\003)2312 2561 y Fw(b)s(ecause)j(the)g (restriction)e(of)h(\010)257 2682 y(to)f Fs(mar)s(k)s(s)p Fw(\()p Fs(u)754 2646 y Fr(\003)793 2682 y Fw(\))f(is)g(a)h(renaming)e (of)h(marks.)1551 b Fj(\003)404 2897 y Fw(The)41 b(next)h(lemma)d(sho)m (ws)j(that)e(the)i(deterministic)d(graph)h(rewrite)h(relation)e(is)257 3018 y(sub)s(comm)m(utativ)m(e)33 b(mo)s(dulo)1339 2990 y Fu(\030)1340 3022 y Fw(=)1417 3018 y(.)257 3237 y Fo(Lemma)k(4.10)50 b Fv(F)-7 b(or)33 b(al)5 b(l)35 b Fs(m;)17 b(n)28 b Fu(2)g Fi(N)9 b Fv(,)41 b(the)35 b(fol)5 b(lowing)33 b(statements)i(hold:)373 3433 y(1.)48 b(If)35 b Fs(s)650 3397 y Fr(\003)717 3433 y Fw(=)27 b Fs(l)851 3397 y Fr(\003)849 3458 y Fq(1)891 3433 y Fs(\033)950 3397 y Fr(\003)946 3458 y Fq(1)1024 3433 y Fu(\))1124 3452 y Fr(R)1184 3433 y Fm(d)1184 3469 y(m)1282 3433 y Fs(r)1329 3397 y Fr(\003)1326 3458 y Fq(1)1368 3433 y Fs(\033)1427 3397 y Fr(\003)1423 3458 y Fq(1)1501 3433 y Fv(and)34 b 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Fl(2)1391 3604 y Fp(\033)1433 3581 y Fk(\003)1431 3625 y Fl(2)1333 3694 y Fr(R)1393 3675 y Fm(d)1393 3711 y(n)1503 3641 y Fw(\026)1501 3659 y Fs(t)1536 3623 y Fr(\003)1576 3659 y Fv(,)g(and)f Fs(s)1872 3623 y Fr(\003)1939 3632 y Fu(\030)1940 3663 y Fw(=)2045 3659 y Fs(t)2080 3623 y Fr(\003)2119 3659 y Fv(,)h(then)g(ther)-5 b(e)33 b(ar)-5 b(e)32 b(marke)-5 b(d)32 b(terms)37 b Fw(~)-53 b Fs(s)3456 3623 y Fr(\003)501 3821 y Fv(and)694 3802 y Fw(~)692 3821 y Fs(t)727 3785 y Fr(\003)804 3821 y Fv(such)36 b(that)h(\(i\))j Fw(\026)-53 b Fs(s)1420 3785 y Fr(\003)1490 3821 y Fu(\))1590 3766 y Fp(l)1612 3742 y Fk(\003)1611 3786 y Fl(2)1648 3766 y Fp(\033)1690 3742 y Fk(\003)1688 3786 y Fl(2)1590 3856 y Fr(R)1650 3837 y Fm(d)1650 3873 y(n)1766 3821 y Fw(~)g Fs(s)1808 3785 y Fr(\003)1884 3821 y Fv(or)40 b Fw(\026)-53 b Fs(s)2057 3785 y Fr(\003)2128 3821 y Fw(=)34 b(~)-53 b Fs(s)2280 3785 y Fr(\003)2320 3821 y Fv(,)37 b(\(ii\))2564 3802 y Fw(\026)2563 3821 y Fs(t)2598 3785 y Fr(\003)2668 3821 y Fu(\))2768 3766 y Fp(l)2790 3742 y Fk(\003)2789 3786 y Fl(1)2826 3766 y Fp(\033)2868 3742 y Fk(\003)2866 3786 y Fl(1)2768 3856 y Fr(R)2828 3837 y Fm(d)2828 3873 y(m)2941 3802 y Fw(~)2940 3821 y Fs(t)2975 3785 y Fr(\003)3051 3821 y Fv(or)3180 3802 y Fw(\026)3178 3821 y Fs(t)3213 3785 y Fr(\003)3284 3821 y Fw(=)3392 3802 y(~)3391 3821 y Fs(t)3426 3785 y Fr(\003)3465 3821 y Fv(,)501 3965 y(and)e(\(iii\))j Fw(~)-53 b Fs(s)941 3929 y Fr(\003)1008 3938 y Fu(\030)1009 3970 y Fw(=)1114 3947 y(~)1113 3965 y Fs(t)1148 3929 y Fr(\003)1188 3965 y Fv(.)257 4184 y(Pr)-5 b(o)g(of)87 b Fw(The)44 b(pro)s(of)e(is)h(similar)c(to)k(that)f (of)h(Lemma)e(3.7.)74 b(Again,)45 b(w)m(e)f(pro)s(ceed)f(b)m(y)257 4305 y(induction)31 b(on)h Fs(m)21 b Fw(+)f Fs(n)p Fw(.)43 b(The)33 b(base)f(case)h Fs(m)21 b Fw(+)f Fs(n)28 b Fw(=)g(0)j(holds)g (v)-5 b(acuously)d(.)44 b(Supp)s(ose)33 b(the)257 4425 y(lemma)i(holds)j(for)e(all)g Fs(m)1216 4389 y Fr(0)1277 4425 y Fw(and)h Fs(n)1529 4389 y Fr(0)1590 4425 y Fw(with)g Fs(m)1902 4389 y Fr(0)1951 4425 y Fw(+)25 b Fs(n)2110 4389 y Fr(0)2169 4425 y Fs(<)36 b(`)p Fw(.)58 b(In)37 b(the)h(induction)f(step,)i(w)m(e)257 4545 y(ha)m(v)m(e)j(to)d(pro)m(v) m(e)i(that)f(the)g(lemma)d(holds)j(for)f(all)f Fs(m)i Fw(and)g Fs(n)g Fw(with)f Fs(m)28 b Fw(+)f Fs(n)40 b Fw(=)g Fs(`)p Fw(.)65 b(By)257 4666 y(using)40 b(Lemma)f(4.9,)i(it)e (is)h(not)g(di\016cult)f(to)g(pro)m(v)m(e)j(that)d(the)i(inductiv)m(e)f (h)m(yp)s(othesis)257 4786 y(implies)35 b(the)i(v)-5 b(alidit)m(y)36 b(of)g(the)i(diagrams)d(in)h(Figure)g(3,)i(where)h Fs(m)2746 4750 y Fr(0)2794 4786 y Fw(+)25 b Fs(n)2953 4750 y Fr(0)3012 4786 y Fs(<)35 b(`)i Fw(and)h Fu(!)257 4907 y Fw(stands)c(for)e Fu(\))p Fw(.)257 5027 y(\(1\))h(Let)g Fs(s)636 4991 y Fr(\003)704 5027 y Fw(=)28 b Fs(l)839 4991 y Fr(\003)837 5052 y Fq(1)878 5027 y Fs(\033)937 4991 y Fr(\003)933 5052 y Fq(1)1009 5027 y Fu(\))1109 5046 y Fr(R)1169 5027 y Fm(d)1169 5063 y(m)1265 5027 y Fs(r)1312 4991 y Fr(\003)1309 5052 y Fq(1)1351 5027 y Fs(\033)1410 4991 y Fr(\003)1406 5052 y Fq(1)1482 5027 y Fw(and)33 b Fs(s)1718 4991 y Fr(\003)1786 5027 y Fw(=)28 b Fs(l)1921 4991 y Fr(\003)1919 5052 y Fq(2)1961 5027 y Fs(\033)2020 4991 y Fr(\003)2016 5052 y Fq(2)2092 5027 y Fu(\))2192 5046 y Fr(R)2252 5027 y Fm(d)2252 5063 y(n)2331 5027 y Fs(r)2378 4991 y Fr(\003)2375 5052 y Fq(2)2417 5027 y Fs(\033)2476 4991 y Fr(\003)2472 5052 y Fq(2)2515 5027 y Fw(.)45 b(Clearly)-8 b(,)32 b Fs(l)2976 4991 y Fr(\003)2974 5052 y Fq(1)3044 5027 y Fu(!)c Fs(r)3219 4991 y Fr(\003)3216 5052 y Fq(1)3286 5027 y Fu(\()g Fs(c)3456 4991 y Fr(\003)3456 5052 y Fq(1)257 5147 y Fw(and)69 b Fs(l)514 5111 y Fr(\003)512 5172 y Fq(2)643 5147 y Fu(!)89 b Fs(r)879 5111 y Fr(\003)876 5172 y Fq(2)1007 5147 y Fu(\()g Fs(c)1238 5111 y Fr(\003)1238 5172 y Fq(2)1346 5147 y Fw(are)69 b(mark)m(ed)g(v)m(ersions)h(of)e(the)h(same)g(rewrite) g(rule)257 5268 y Fs(\032)64 b Fw(:)g Fs(l)30 b Fu(!)d Fs(r)j Fu(\()d Fs(c)64 b Fu(2)g(R)54 b Fw(b)s(ecause)h Fu(R)f Fw(is)f(orthogonal.)104 b(Apparen)m(tly)-8 b(,)60 b(the)54 b(restric-)257 5388 y(tions)k(of)g Fs(\033)718 5352 y Fr(\003)714 5413 y Fq(1)815 5388 y Fw(and)h Fs(\033)1090 5352 y Fr(\003)1086 5413 y Fq(2)1187 5388 y Fw(to)f Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))59 b(coincide.)120 b(So)58 b(if)f Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))71 b Fu(\022)h(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\),)65 b(then)1828 5637 y(18)p eop %%Page: 19 19 19 18 bop 570 503 a Fs(:)625 476 y Fu(\030)626 507 y Fw(=)730 503 y Fs(:)885 421 y Fr(R)945 397 y Fm(d)945 451 y(n)983 437 y Fk(0)1151 478 y Fs(:)630 770 y Fr(R)690 747 y Fm(d)690 801 y(m)744 787 y Fk(0)1197 770 y Fr(R)1257 747 y Fm(d)1257 801 y(m)1311 787 y Fk(0)584 1045 y Fs(:)743 988 y Fr(R)803 964 y Fm(d)803 1018 y(n)841 1004 y Fk(0)1005 1070 y Fs(:)1060 1043 y Fu(\030)1060 1074 y Fw(=)1165 1070 y Fs(:)p 787 475 331 4 v 1035 473 a Fh(-)p 596 993 4 473 v 598 993 a(?)p 1163 539 4 19 v 1163 577 V 1163 615 V 1163 653 V 1163 691 V 1163 728 V 1163 766 V 1163 804 V 1163 842 V 1163 880 V 1163 917 V 1163 955 V 1163 993 V 1163 993 4 48 v 484 w(?)p 664 1042 19 4 v 702 1042 V 739 1042 V 777 1042 V 815 1042 V 853 1042 V 891 1042 V 928 1042 48 4 v 893 1040 a(-)1518 503 y Fs(:)1573 476 y Fu(\030)1574 507 y Fw(=)1678 503 y Fs(:)1833 421 y Fr(R)1893 397 y Fm(d)1893 451 y(n)1931 437 y Fk(0)2099 478 y Fs(:)1578 770 y Fr(R)1638 747 y Fm(d)1638 801 y(m)1692 787 y Fk(0)1578 989 y Fr(\003)2145 770 y(R)2205 747 y Fm(d)2205 801 y(m)2259 787 y Fk(0)2145 989 y Fr(\003)1532 1045 y Fs(:)1691 988 y Fr(R)1751 964 y Fm(d)1751 1018 y(n)1789 1004 y Fk(0)1953 1070 y Fs(:)2008 1043 y Fu(\030)2008 1074 y Fw(=)2113 1070 y Fs(:)p 1735 475 331 4 v 1983 473 a Fh(-)p 1544 993 4 473 v 1546 993 a(?)p 2111 539 4 19 v 2111 577 V 2111 615 V 2111 653 V 2111 691 V 2111 728 V 2111 766 V 2111 804 V 2111 842 V 2111 880 V 2111 917 V 2111 955 V 2111 993 V 2111 993 4 48 v 484 w(?)p 1612 1042 19 4 v 1650 1042 V 1687 1042 V 1725 1042 V 1763 1042 V 1801 1042 V 1838 1042 V 1876 1042 48 4 v 1841 1040 a(-)2466 503 y Fs(:)2521 476 y Fu(\030)2522 507 y Fw(=)2626 503 y Fs(:)2781 421 y Fr(R)2841 397 y Fm(d)2841 451 y(n)2879 437 y Fk(0)3047 478 y Fs(:)2960 449 y Fu(\003)2526 770 y Fr(R)2586 747 y Fm(d)2586 801 y(m)2640 787 y Fk(0)2526 989 y Fr(\003)3093 770 y(R)3153 747 y Fm(d)3153 801 y(m)3207 787 y Fk(0)3093 989 y Fr(\003)2480 1045 y Fs(:)2639 988 y Fr(R)2699 964 y Fm(d)2699 1018 y(n)2737 1004 y Fk(0)2825 1008 y Fr(\003)2901 1070 y Fs(:)2956 1043 y Fu(\030)2956 1074 y Fw(=)3061 1070 y Fs(:)p 2683 475 331 4 v 2931 473 a Fh(-)p 2492 993 4 473 v 2494 993 a(?)p 3059 539 4 19 v 3059 577 V 3059 615 V 3059 653 V 3059 691 V 3059 728 V 3059 766 V 3059 804 V 3059 842 V 3059 880 V 3059 917 V 3059 955 V 3059 993 V 3059 993 4 48 v 483 w(?)p 2560 1042 19 4 v 2597 1042 V 2635 1042 V 2673 1042 V 2711 1042 V 2749 1042 V 2786 1042 V 2824 1042 48 4 v 2788 1040 a(-)776 1351 y Fw(Figure)31 b(3:)43 b(The)34 b(induction)d(h)m(yp)s(othesis)j(of)e (Lemma)f(4.10.)257 1637 y Fs(r)304 1600 y Fr(\003)301 1661 y Fq(1)343 1637 y Fs(\033)402 1600 y Fr(\003)398 1661 y Fq(1)516 1609 y Fu(\030)517 1641 y Fw(=)667 1637 y Fs(r)714 1600 y Fr(\003)711 1661 y Fq(2)753 1637 y Fs(\033)812 1600 y Fr(\003)808 1661 y Fq(2)911 1637 y Fw(since)61 b Fs(r)1225 1600 y Fr(\003)1222 1661 y Fq(1)1323 1637 y Fw(and)f Fs(r)1587 1600 y Fr(\003)1584 1661 y Fq(2)1686 1637 y Fw(are)g(freshly)g(mark)m(ed.)125 b(Supp)s(ose)61 b(otherwise)257 1757 y(that)45 b Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))48 b Fu(6\022)g(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\).)80 b(W)-8 b(e)45 b(sho)m(w)h(that)e(in)g(this)g(case)i Fs(\033)2588 1721 y Fr(\003)2584 1782 y Fq(1)2675 1729 y Fu(\030)2676 1761 y Fw(=)2801 1757 y Fs(\033)2860 1721 y Fr(\003)2856 1782 y Fq(2)2944 1757 y Fw(holds.)79 b(Since)257 1877 y Fs(\033)316 1841 y Fr(\003)312 1902 y Fq(1)388 1877 y Fw(=)32 b Fs(\033)555 1841 y Fr(\003)551 1902 y Fq(2)629 1877 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\)],)36 b(it)e(remains)g(to)h(b)s(e)g(sho)m(wn)i(that)d Fs(\033)2314 1841 y Fr(\003)2310 1902 y Fq(1)2386 1850 y Fu(\030)2387 1881 y Fw(=)2495 1877 y Fs(\033)2554 1841 y Fr(\003)2550 1902 y Fq(2)2629 1877 y Fw([)p Fu(E)9 b(V)f Fs(ar)s Fw(\()p Fs(\032)p Fw(\)].)51 b(W)-8 b(e)35 b(sho)m(w)257 1998 y(b)m(y)48 b(induction)f(on)g Fs(i)g Fw(that)g Fs(\033)1371 1962 y Fr(\003)1367 2022 y Fq(1)1463 1970 y Fu(\030)1464 2002 y Fw(=)1593 1998 y Fs(\033)1652 1962 y Fr(\003)1648 2022 y Fq(2)1738 1998 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))33 b Fu([)2170 1923 y Ft(S)2253 1949 y Fp(i)2253 2027 y(j)t Fq(=1)2397 1998 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)2637 2013 y Fp(j)2673 1998 y Fw(\)].)88 b(If)47 b Fs(i)53 b Fw(=)f(0,)f(then)257 2118 y Fs(\033)316 2082 y Fr(\003)312 2143 y Fq(1)407 2118 y Fw(=)f Fs(\033)592 2082 y Fr(\003)588 2143 y Fq(2)678 2118 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\)].)85 b(So)46 b(let)f Fs(i)51 b(>)g Fw(0.)84 b(According)46 b(to)g(the)h(inductiv)m(e)f(h)m(yp)s(othesis,)257 2238 y Fs(\033)316 2202 y Fr(\003)312 2263 y Fq(1)383 2211 y Fu(\030)384 2243 y Fw(=)489 2238 y Fs(\033)548 2202 y Fr(\003)544 2263 y Fq(2)617 2238 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))18 b Fu([)1020 2164 y Ft(S)1103 2190 y Fp(i)p Fr(\000)p Fq(1)1103 2267 y Fp(j)t Fq(=1)1246 2238 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)1486 2253 y Fp(j)1523 2238 y Fw(\)].)43 b(Since)30 b Fu(V)8 b Fs(ar)s Fw(\()p Fs(s)2161 2253 y Fp(i)2189 2238 y Fw(\))28 b Fu(\022)g(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))18 b Fu([)2736 2164 y Ft(S)2819 2190 y Fp(i)p Fr(\000)p Fq(1)2819 2267 y Fp(j)t Fq(=1)2962 2238 y Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)3202 2253 y Fp(j)3239 2238 y Fw(\),)30 b(it)g(is)257 2359 y(su\016cien)m(t)39 b(to)e(sho)m(w)h Fs(\033)1101 2323 y Fr(\003)1097 2383 y Fq(1)1177 2331 y Fu(\030)1178 2363 y Fw(=)1290 2359 y Fs(\033)1349 2323 y Fr(\003)1345 2383 y Fq(2)1426 2359 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)1693 2374 y Fp(i)1721 2359 y Fw(\)].)58 b(There)39 b(are)e(mark)m(ed)h (ground)f(constructor)257 2479 y(terms)f Fs(u)588 2443 y Fr(\003)588 2504 y Fq(1)627 2479 y Fs(;)17 b(u)727 2443 y Fr(\003)727 2504 y Fq(2)766 2479 y Fs(;)g(v)861 2443 y Fr(\003)857 2504 y Fq(1)900 2479 y Fs(;)g(v)995 2443 y Fr(\003)991 2504 y Fq(2)1069 2479 y Fw(suc)m(h)38 b(that)d Fs(s)1553 2443 y Fr(\003)1553 2504 y Fp(i)1593 2479 y Fs(\033)1652 2443 y Fr(\003)1648 2504 y Fq(1)1724 2479 y Fu(\))1824 2443 y Fr(\003)1824 2516 y(R)1884 2494 y Fm(d)1884 2538 y(m)p Fk(\000)p Fl(1)2025 2479 y Fs(u)2081 2443 y Fr(\003)2081 2504 y Fq(1)2120 2479 y Fw(,)i Fs(t)2219 2443 y Fr(\003)2219 2504 y Fp(i)2258 2479 y Fs(\033)2317 2443 y Fr(\003)2313 2504 y Fq(1)2389 2479 y Fu(\))2489 2443 y Fr(\003)2489 2516 y(R)2549 2494 y Fm(d)2549 2538 y(m)p Fk(\000)p Fl(1)2690 2479 y Fs(u)2746 2443 y Fr(\003)2746 2504 y Fq(2)2785 2479 y Fw(,)g(where)g Fs(u)3190 2443 y Fr(\003)3190 2504 y Fq(1)3262 2479 y Fu(\030)d Fs(u)3429 2443 y Fr(\003)3429 2504 y Fq(2)3468 2479 y Fw(,)257 2622 y(and)40 b Fs(s)500 2586 y Fr(\003)500 2647 y Fp(i)539 2622 y Fs(\033)598 2586 y Fr(\003)594 2647 y Fq(2)670 2622 y Fu(\))770 2586 y Fr(\003)770 2659 y(R)830 2636 y Fm(d)830 2680 y(n)p Fk(\000)p Fl(1)955 2622 y Fs(v)1006 2586 y Fr(\003)1002 2647 y Fq(1)1045 2622 y Fw(,)h Fs(t)1148 2586 y Fr(\003)1148 2647 y Fp(i)1187 2622 y Fs(\033)1246 2586 y Fr(\003)1242 2647 y Fq(2)1318 2622 y Fu(\))1418 2586 y Fr(\003)1418 2659 y(R)1478 2636 y Fm(d)1478 2680 y(n)p Fk(\000)p Fl(1)1603 2622 y Fs(v)1654 2586 y Fr(\003)1650 2647 y Fq(2)1693 2622 y Fw(,)g(where)f Fs(v)2100 2586 y Fr(\003)2096 2647 y Fq(1)2178 2622 y Fu(\030)f Fs(v)2345 2586 y Fr(\003)2341 2647 y Fq(2)2385 2622 y Fw(.)62 b(It)39 b(no)m(w)h(follo)m(ws)e(from)g(the)257 2765 y(inductiv)m(e)k(h)m(yp)s (othesis)h(on)f Fs(`)f Fw(in)g(com)m(bination)f(with)h Fs(s)2371 2729 y Fr(\003)2371 2790 y Fp(i)2411 2765 y Fs(\033)2470 2729 y Fr(\003)2466 2790 y Fq(1)2552 2737 y Fu(\030)2553 2769 y Fw(=)2673 2765 y Fs(s)2719 2729 y Fr(\003)2719 2790 y Fp(i)2758 2765 y Fs(\033)2817 2729 y Fr(\003)2813 2790 y Fq(2)2899 2765 y Fw(that)g Fs(u)3175 2729 y Fr(\003)3175 2790 y Fq(1)3257 2737 y Fu(\030)3258 2769 y Fw(=)3378 2765 y Fs(v)3429 2729 y Fr(\003)3425 2790 y Fq(1)3468 2765 y Fw(.)257 2885 y(Th)m(us)i Fs(u)569 2849 y Fr(\003)569 2910 y Fq(2)650 2885 y Fu(\030)g Fs(u)826 2849 y Fr(\003)826 2910 y Fq(1)907 2885 y Fu(\030)g Fs(v)1078 2849 y Fr(\003)1074 2910 y Fq(1)1160 2885 y Fu(\030)f Fs(v)1330 2849 y Fr(\003)1326 2910 y Fq(2)1369 2885 y Fw(.)70 b(As)41 b(in)g(the)g(pro)s(of)g(of)f(Lemma)g(3.7,)j(for)e(ev)m (ery)i(extra)257 3006 y(v)-5 b(ariable)34 b Fs(x)p Fw(,)j(there)f(are)g (mark)m(ed)g(ground)f(constructor)i(terms)e Fs(u)2695 2969 y Fr(\003)2695 3030 y Fp(x)2774 3006 y Fw(and)h Fs(v)3018 2969 y Fr(\003)3014 3030 y Fp(x)3093 3006 y Fw(suc)m(h)h(that)257 3126 y Fs(x\033)371 3090 y Fr(\003)367 3151 y Fq(1)452 3126 y Fw(=)k Fs(u)625 3090 y Fr(\003)625 3151 y Fp(x)668 3126 y Fw(,)h Fs(x\033)851 3090 y Fr(\003)847 3151 y Fq(2)932 3126 y Fw(=)e Fs(v)1099 3090 y Fr(\003)1095 3151 y Fp(x)1139 3126 y Fw(,)j(and)d Fs(u)1462 3090 y Fr(\003)1462 3151 y Fp(x)1546 3126 y Fu(\030)h Fs(v)1715 3090 y Fr(\003)1711 3151 y Fp(x)1755 3126 y Fw(.)67 b(Since)40 b(the)h(marks)f(on)g(instan)m(tiated)g(extra)257 3246 y(v)-5 b(ariables)29 b(are)i(fresh)g(and)f(m)m(utually)e(distinct,)i(w) m(e)i(\014nally)d(deriv)m(e)i Fs(\033)2807 3210 y Fr(\003)2803 3271 y Fq(1)2874 3219 y Fu(\030)2875 3251 y Fw(=)2979 3246 y Fs(\033)3038 3210 y Fr(\003)3034 3271 y Fq(2)3108 3246 y Fw([)p Fu(V)8 b Fs(ar)s Fw(\()p Fs(t)3375 3261 y Fp(i)3403 3246 y Fw(\)].)257 3381 y(\(2\))62 b(By)h(Lemma)d(4.9,)69 b(it)61 b(is)h(su\016cien)m(t)h(to)f(pro)m(v)m(e)h(that)f(if)f Fs(t)2755 3345 y Fr(\003)2873 3381 y Fu(\))2973 3326 y Fp(l)2995 3303 y Fk(\003)2994 3347 y Fl(1)3030 3326 y Fp(\033)3072 3303 y Fk(\003)3070 3347 y Fl(1)2973 3416 y Fr(R)3033 3397 y Fm(d)3033 3433 y(m)3195 3381 y Fw(\026)-53 b Fs(s)3237 3345 y Fr(\003)3338 3381 y Fw(and)257 3543 y Fs(t)292 3507 y Fr(\003)381 3543 y Fu(\))481 3488 y Fp(l)503 3464 y Fk(\003)502 3508 y Fl(2)538 3488 y Fp(\033)580 3464 y Fk(\003)578 3508 y Fl(2)481 3578 y Fr(R)541 3559 y Fm(d)541 3594 y(n)671 3524 y Fw(\026)670 3543 y Fs(t)705 3507 y Fr(\003)745 3543 y Fw(,)48 b(then)d(\(i\))j(\026)-53 b Fs(s)1248 3507 y Fr(\003)1336 3543 y Fu(\))1436 3488 y Fp(l)1458 3464 y Fk(\003)1457 3508 y Fl(2)1494 3488 y Fp(\033)1536 3464 y Fk(\003)1534 3508 y Fl(2)1436 3578 y Fr(R)1496 3559 y Fm(d)1496 3594 y(n)1629 3543 y Fw(~)g Fs(s)1671 3507 y Fr(\003)1756 3543 y Fw(or)48 b(\026)-53 b Fs(s)1933 3507 y Fr(\003)2021 3543 y Fw(=)53 b(~)-53 b Fs(s)2192 3507 y Fr(\003)2232 3543 y Fw(,)48 b(\(ii\))2483 3524 y(\026)2482 3543 y Fs(t)2517 3507 y Fr(\003)2605 3543 y Fu(\))2705 3488 y Fp(l)2727 3464 y Fk(\003)2726 3508 y Fl(1)2763 3488 y Fp(\033)2805 3464 y Fk(\003)2803 3508 y Fl(1)2705 3578 y Fr(R)2765 3559 y Fm(d)2765 3594 y(m)2896 3524 y Fw(~)2894 3543 y Fs(t)2929 3507 y Fr(\003)3014 3543 y Fw(or)3147 3524 y(\026)3145 3543 y Fs(t)3180 3507 y Fr(\003)3269 3543 y Fw(=)3395 3524 y(~)3393 3543 y Fs(t)3428 3507 y Fr(\003)3468 3543 y Fw(,)257 3687 y(and)26 b(\(iii\))h(~)-53 b Fs(s)669 3651 y Fr(\003)736 3660 y Fu(\030)737 3691 y Fw(=)843 3669 y(~)842 3687 y Fs(t)877 3651 y Fr(\003)942 3687 y Fw(for)25 b(some)h(mark)m(ed)g(terms)k(~)-53 b Fs(s)1973 3651 y Fr(\003)2038 3687 y Fw(and)2223 3669 y(~)2221 3687 y Fs(t)2256 3651 y Fr(\003)2296 3687 y Fw(.)41 b(W)-8 b(e)27 b(distinguish)d(three)j(cases:)257 3928 y(\(a\))33 b Fs(l)446 3892 y Fr(\003)444 3953 y Fq(1)485 3928 y Fs(\033)544 3892 y Fr(\003)540 3953 y Fq(1)611 3928 y Fw(=)28 b Fs(l)746 3892 y Fr(\003)744 3953 y Fq(2)786 3928 y Fs(\033)845 3892 y Fr(\003)841 3953 y Fq(2)884 3928 y Fw(,)257 4048 y(\(b\))33 b Fs(l)451 4012 y Fr(\003)449 4073 y Fq(1)491 4048 y Fs(\033)550 4012 y Fr(\003)546 4073 y Fq(1)622 4048 y Fw(is)f(neither)g(a)h (subterm)f(of)h Fs(l)1654 4012 y Fr(\003)1652 4073 y Fq(2)1693 4048 y Fs(\033)1752 4012 y Fr(\003)1748 4073 y Fq(2)1824 4048 y Fw(nor)g(con)m(v)m(ersely)-8 b(,)257 4169 y(\(c\))33 b Fs(l)440 4133 y Fr(\003)438 4193 y Fq(1)480 4169 y Fs(\033)539 4133 y Fr(\003)535 4193 y Fq(1)611 4169 y Fw(is)f(a)g(prop)s(er)h(subterm)g(of)f Fs(l)1624 4133 y Fr(\003)1622 4193 y Fq(2)1663 4169 y Fs(\033)1722 4133 y Fr(\003)1718 4193 y Fq(2)1762 4169 y Fw(.)257 4410 y(\(a\))h(With)f(the)h(aid)e(of)h(\(1\),)g(this)h (follo)m(ws)e(easily)-8 b(.)257 4530 y(\(b\))49 b(The)h(pro)s(of)e(is)g (analogous)g(to)g(Prop)s(osition)f(3.19,)52 b(\(1\),)h(case)d(1)e(in)g ([12].)92 b(W)-8 b(e)257 4650 y(ma)m(y)63 b(write)h Fs(t)815 4614 y Fr(\003)934 4650 y Fw(=)80 b Fs(C)1167 4614 y Fr(\003)1206 4650 y Fw([)p Fs(l)1264 4614 y Fr(\003)1262 4675 y Fp(i)1286 4684 y Fl(1)1325 4650 y Fs(\033)1384 4614 y Fr(\003)1380 4675 y Fp(i)1404 4684 y Fl(1)1444 4650 y Fs(;)17 b(:)g(:)g(:)e(;)i(l)1693 4614 y Fr(\003)1691 4675 y Fp(i)1715 4683 y Fm(p)1756 4650 y Fs(\033)1815 4614 y Fr(\003)1811 4675 y Fp(i)1835 4683 y Fm(p)1875 4650 y Fw(],)71 b(where)65 b Fs(i)2346 4665 y Fp(j)2463 4650 y Fu(2)80 b(f)p Fw(1)p Fs(;)17 b Fw(2)p Fu(g)62 b Fw(for)h(ev)m(ery)i(in-)257 4771 y(dex)59 b Fs(j)77 b Fu(2)72 b(f)p Fw(1)p Fs(;)17 b(:)g(:)g(:)e(;)i(p)p Fu(g)p Fw(.)120 b(Without)57 b(loss)h(of)f(generalit)m(y)-8 b(,)64 b(w)m(e)59 b(ma)m(y)f(assume)g(that)257 4891 y(1)e(=)h Fs(i)528 4906 y Fq(1)624 4891 y Fu(\024)f Fs(i)790 4906 y Fq(2)886 4891 y Fu(\024)h(\001)17 b(\001)g(\001)55 b(\024)h Fs(i)1359 4906 y Fp(p)1456 4891 y Fw(=)g(2.)94 b(That)49 b(is)g(to)g(sa)m(y)-8 b(,)55 b Fs(t)2513 4855 y Fr(\003)2609 4891 y Fw(=)h Fs(C)2818 4855 y Fr(\003)2857 4891 y Fw([)p Fs(l)2915 4855 y Fr(\003)2913 4916 y Fq(1)2955 4891 y Fs(\033)3014 4855 y Fr(\003)3010 4916 y Fq(1)3053 4891 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)3303 4855 y Fr(\003)3301 4916 y Fq(2)3343 4891 y Fs(\033)3402 4855 y Fr(\003)3398 4916 y Fq(2)3441 4891 y Fw(].)257 5011 y(Then)66 b(\026)-53 b Fs(s)586 4975 y Fr(\003)699 5011 y Fw(=)75 b Fs(C)927 4975 y Fr(\003)966 5011 y Fw([)p Fs(r)1040 4975 y Fr(\003)1037 5036 y Fq(1)1079 5011 y Fs(\033)1138 4975 y Fr(\003)1134 5036 y Fq(1)1178 5011 y Fs(;)17 b(:)g(:)g(:)e(;)i(l)1427 4975 y Fr(\003)1425 5036 y Fq(2)1467 5011 y Fs(\033)1526 4975 y Fr(\003)1522 5036 y Fq(2)1565 5011 y Fw(])60 b(and)1871 4993 y(\026)1869 5011 y Fs(t)1904 4975 y Fr(\003)2019 5011 y Fw(=)74 b Fs(C)2246 4975 y Fr(\003)2285 5011 y Fw([)p Fs(l)2343 4975 y Fr(\003)2341 5036 y Fq(1)2383 5011 y Fs(\033)2442 4975 y Fr(\003)2438 5036 y Fq(1)2481 5011 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)2747 4975 y Fr(\003)2744 5036 y Fq(2)2786 5011 y Fs(\033)2845 4975 y Fr(\003)2841 5036 y Fq(2)2885 5011 y Fw(].)125 b(According)257 5132 y(to)56 b(Lemma)e(4.9,)62 b(w)m(e)57 b(ma)m(y)e(assume)i(that)f(all)d (marks)j(on)g(function)f(sym)m(b)s(ols)h(in)257 5252 y Fs(r)304 5216 y Fr(\003)301 5277 y Fq(1)343 5252 y Fw(,)68 b Fs(r)485 5216 y Fr(\003)482 5277 y Fq(2)524 5252 y Fw(,)g Fs(x\033)733 5216 y Fr(\003)729 5277 y Fq(1)834 5252 y Fw(and)61 b Fs(y)t(\033)1163 5216 y Fr(\003)1159 5277 y Fq(2)1262 5252 y Fw(\(for)f(ev)m(ery)j(v)-5 b(ariable)59 b Fs(x)76 b Fu(2)g(E)9 b(V)e Fs(ar)s Fw(\()p Fs(l)2725 5267 y Fq(1)2792 5252 y Fu(!)28 b Fs(r)2964 5267 y Fq(1)3031 5252 y Fu(\()f Fs(c)3200 5267 y Fq(1)3239 5252 y Fw(\))61 b(and)257 5373 y Fs(y)71 b Fu(2)e(E)9 b(V)f Fs(ar)s Fw(\()p Fs(l)807 5388 y Fq(2)874 5373 y Fu(!)27 b Fs(r)1045 5388 y Fq(2)1112 5373 y Fu(\()g Fs(c)1281 5388 y Fq(2)1321 5373 y Fw(\)\))56 b(are)g(pairwise)g(distinct)f(and)h(fresh)h(w.r.t.)g Fs(t)3211 5336 y Fr(\003)3251 5373 y Fw(.)114 b(\(If)1828 5637 y(19)p eop %%Page: 20 20 20 19 bop 1292 665 a Fs(t)1327 629 y Fr(\003)1578 665 y Fw(=)-17 b Fu(\))1737 685 y Fr(R)1797 666 y Fm(d)1797 701 y(n)2056 665 y Fw(\026)-55 b Fs(u)2106 629 y Fr(\003)2228 638 y Fu(\030)2229 670 y Fw(=)2391 647 y(\026)2390 665 y Fs(t)2425 629 y Fr(\003)1291 702 y Ft(w)1291 761 y(w)1291 821 y(\177)1368 812 y Fr(R)1428 788 y Fm(d)1428 829 y(m)2067 702 y Ft(w)2067 761 y(w)2067 821 y(\177)2145 812 y Fr(R)2205 788 y Fm(d)2205 829 y(m)2388 702 y Ft(w)2388 761 y(w)2388 821 y(\177)2466 812 y Fr(R)2526 788 y Fm(d)2526 829 y(m)1291 965 y Fw(\026)i Fs(s)1333 929 y Fr(\003)1455 965 y Fw(=)-17 b Fu(\))1614 985 y Fr(R)1674 966 y Fm(d)1674 1001 y(n)1753 965 y Fw(~)-53 b Fs(s)1795 929 y Fr(\003)1889 938 y Fu(\030)1890 970 y Fw(=)2056 965 y(~)e Fs(u)2106 929 y Fr(\003)2228 938 y Fu(\030)2229 970 y Fw(=)2391 947 y(~)2390 965 y Fs(t)2425 929 y Fr(\003)1663 1195 y Fw(Figure)31 b(4:)257 1475 y(\()p Fs(mar)s(k)s(s)p Fw(\()p Fs(r)663 1438 y Fr(\003)660 1499 y Fq(1)703 1475 y Fw(\))h Fu([)h Fs(mar)s(k)s(s)p Fw(\()p Fs(\033)1252 1438 y Fr(\003)1248 1499 y Fq(1)1292 1475 y Fw(\)\))f Fu(\\)h Fw(\()p Fs(mar)s(k)s(s)p Fw(\()p Fs(r)1905 1438 y Fr(\003)1902 1499 y Fq(2)1944 1475 y Fw(\))f Fu([)h Fs(mar)s(k)s(s)p Fw(\()p Fs(\033)2493 1438 y Fr(\003)2489 1499 y Fq(2)2533 1475 y Fw(\)\))53 b Fu(6)p Fw(=)h Fu(;)p Fw(,)d(then)e(w)m(e)f(tak)m(e)257 1595 y(mark)m(ed)43 b(v)m(ersions)k(\026)-53 b Fs(r)1040 1559 y Fr(\003)1037 1620 y Fq(2)1121 1595 y Fw(and)47 b(\026)-54 b Fs(\033)1379 1559 y Fr(\003)1375 1620 y Fq(2)1460 1595 y Fw(with)42 b(\()p Fs(mar)s(k)s(s)p Fw(\()p Fs(r)2098 1559 y Fr(\003)2095 1620 y Fq(1)2137 1595 y Fw(\))28 b Fu([)h Fs(mar)s(k)s(s)p Fw(\()p Fs(\033)2678 1559 y Fr(\003)2674 1620 y Fq(1)2718 1595 y Fw(\)\))f Fu(\\)h Fw(\()p Fs(mar)s(k)s(s)p Fw(\()t(\026)-53 b Fs(r)3323 1559 y Fr(\003)3320 1620 y Fq(2)3362 1595 y Fw(\))29 b Fu([)257 1730 y Fs(mar)s(k)s(s)p Fw(\()5 b(\026)-54 b Fs(\033)637 1694 y Fr(\003)633 1754 y Fq(2)677 1730 y Fw(\)\))40 b(=)h Fu(;)p Fw(,)h(observ)m(e)g(that)e Fs(t)1638 1694 y Fr(\003)1718 1730 y Fu(\))1818 1675 y Fp(l)1840 1651 y Fk(\003)1839 1695 y Fl(2)1879 1675 y Fq(\026)-39 b Fp(\033)1917 1651 y Fk(\003)1915 1695 y Fl(2)1818 1765 y Fr(R)1878 1746 y Fm(d)1878 1781 y(n)1999 1730 y Fs(C)2076 1694 y Fr(\003)2115 1730 y Fw([)p Fs(l)2173 1694 y Fr(\003)2171 1754 y Fq(1)2213 1730 y Fs(\033)2272 1694 y Fr(\003)2268 1754 y Fq(1)2311 1730 y Fs(;)17 b(:)g(:)g(:)f(;)21 b Fw(\026)-53 b Fs(r)2577 1694 y Fr(\003)2574 1754 y Fq(2)2621 1730 y Fw(\026)f Fs(\033)2675 1694 y Fr(\003)2671 1754 y Fq(2)2714 1730 y Fw(])41 b(=)46 b(\026)-55 b Fs(u)2954 1694 y Fr(\003)2993 1730 y Fw(,)42 b(and)e(apply)257 1864 y(Lemma)34 b(4.9;)j(see)g(Figure)d(4.\))52 b(No)m(w)36 b(if)e(w)m(e)j(con)m(tract)f(the)g(redex)g Fs(l)2750 1828 y Fr(\003)2748 1889 y Fq(2)2790 1864 y Fs(\033)2849 1828 y Fr(\003)2845 1889 y Fq(2)2924 1864 y Fw(in)j(\026)-53 b Fs(s)3087 1828 y Fr(\003)3161 1864 y Fw(to)36 b Fs(r)3331 1828 y Fr(\003)3328 1889 y Fq(2)3370 1864 y Fs(\033)3429 1828 y Fr(\003)3425 1889 y Fq(2)3468 1864 y Fw(,)257 1985 y(then)h(w)m(e)g(obtain)i(~)-53 b Fs(s)983 1949 y Fr(\003)1057 1985 y Fw(=)33 b Fs(C)1243 1949 y Fr(\003)1283 1985 y Fw([)p Fs(r)1357 1949 y Fr(\003)1354 2010 y Fq(1)1396 1985 y Fs(\033)1455 1949 y Fr(\003)1451 2010 y Fq(1)1494 1985 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)1760 1949 y Fr(\003)1757 2010 y Fq(2)1799 1985 y Fs(\033)1858 1949 y Fr(\003)1854 2010 y Fq(2)1897 1985 y Fw(].)55 b(Analogously)-8 b(,)35 b(con)m(tracting)h Fs(l)3129 1949 y Fr(\003)3127 2010 y Fq(1)3169 1985 y Fs(\033)3228 1949 y Fr(\003)3224 2010 y Fq(1)3303 1985 y Fw(in)3422 1966 y(\026)3421 1985 y Fs(t)3456 1949 y Fr(\003)257 2105 y Fw(yields)533 2087 y(~)532 2105 y Fs(t)567 2069 y Fr(\003)634 2105 y Fw(=)27 b Fs(C)814 2069 y Fr(\003)854 2105 y Fw([)p Fs(r)928 2069 y Fr(\003)925 2130 y Fq(1)967 2105 y Fs(\033)1026 2069 y Fr(\003)1022 2130 y Fq(1)1066 2105 y Fs(;)17 b(:)g(:)g(:)e(;)i (r)1331 2069 y Fr(\003)1328 2130 y Fq(2)1370 2105 y Fs(\033)1429 2069 y Fr(\003)1425 2130 y Fq(2)1469 2105 y Fw(].)257 2226 y(\(c\))32 b(W)-8 b(e)32 b(pro)s(ceed)g(in)e(analogy)h(to)g(Prop)s (osition)e(3.19,)i(\(1\),)h(case)g(2)f(in)g([12)o(].)44 b(As)31 b(in)g(\(b\),)257 2346 y(w)m(e)j(ma)m(y)e(write)h Fs(t)897 2310 y Fr(\003)969 2346 y Fw(as)701 2557 y Fs(t)736 2516 y Fr(\003)804 2557 y Fw(=)27 b Fs(C)984 2516 y Fr(\003)1024 2557 y Fw([)p Fs(l)1082 2516 y Fr(\003)1080 2582 y Fq(1)1121 2557 y Fs(\033)1180 2516 y Fr(\003)1176 2582 y Fq(1)1220 2557 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)1470 2516 y Fr(\003)1468 2582 y Fq(2)1509 2557 y Fs(\033)1568 2516 y Fr(\003)1564 2582 y Fq(2)1607 2557 y Fw(])28 b(=)g Fs(C)1843 2516 y Fr(\003)1882 2557 y Fw([)p Fs(l)1940 2516 y Fr(\003)1938 2582 y Fq(1)1980 2557 y Fs(\033)2039 2516 y Fr(\003)2035 2582 y Fq(1)2078 2557 y Fs(;)17 b(:)g(:)g(:)f(;)2319 2532 y Fw(\026)2297 2557 y Fs(C)2374 2516 y Fr(\003)2413 2557 y Fw([)p Fs(l)2471 2516 y Fr(\003)2469 2582 y Fq(1)2511 2557 y Fs(\033)2570 2516 y Fr(\003)2566 2582 y Fq(1)2609 2557 y Fs(;)h(:)g(:)g(:)f(;)h(l)2859 2516 y Fr(\003)2857 2582 y Fq(1)2899 2557 y Fs(\033)2958 2516 y Fr(\003)2954 2582 y Fq(1)2997 2557 y Fw(]])257 2768 y(where)28 b Fs(l)564 2732 y Fr(\003)562 2793 y Fq(2)604 2768 y Fs(\033)663 2732 y Fr(\003)659 2793 y Fq(2)730 2768 y Fw(=)856 2743 y(\026)834 2768 y Fs(C)911 2732 y Fr(\003)950 2768 y Fw([)p Fs(l)1008 2732 y Fr(\003)1006 2793 y Fq(1)1048 2768 y Fs(\033)1107 2732 y Fr(\003)1103 2793 y Fq(1)1146 2768 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)1396 2732 y Fr(\003)1394 2793 y Fq(1)1435 2768 y Fs(\033)1494 2732 y Fr(\003)1490 2793 y Fq(1)1534 2768 y Fw(])27 b(and)f Fs(l)1802 2732 y Fr(\003)1800 2793 y Fq(1)1842 2768 y Fs(\033)1901 2732 y Fr(\003)1897 2793 y Fq(1)1967 2768 y Fw(is)g(neither)h(a)f(subterm)h (of)g Fs(C)3016 2732 y Fr(\003)3055 2768 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(])26 b(nor)257 2888 y(of)391 2863 y(\026)368 2888 y Fs(C)445 2852 y Fr(\003)485 2888 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(].)43 b(Hence)1106 3099 y(\026)-53 b Fs(s)1148 3058 y Fr(\003)1215 3099 y Fw(=)28 b Fs(C)1396 3058 y Fr(\003)1435 3099 y Fw([)p Fs(r)1509 3058 y Fr(\003)1506 3124 y Fq(1)1548 3099 y Fs(\033)1607 3058 y Fr(\003)1603 3124 y Fq(1)1647 3099 y Fs(;)17 b(:)g(:)g(:)f(;)1887 3074 y Fw(\026)1866 3099 y Fs(C)1943 3058 y Fr(\003)1982 3099 y Fw([)p Fs(r)2056 3058 y Fr(\003)2053 3124 y Fq(1)2095 3099 y Fs(\033)2154 3058 y Fr(\003)2150 3124 y Fq(1)2193 3099 y Fs(;)h(:)g(:)g(:)f(;)h(r) 2459 3058 y Fr(\003)2456 3124 y Fq(1)2498 3099 y Fs(\033)2557 3058 y Fr(\003)2553 3124 y Fq(1)2596 3099 y Fw(]])708 3383 y(\026)707 3401 y Fs(t)742 3360 y Fr(\003)809 3401 y Fw(=)28 b Fs(C)990 3360 y Fr(\003)1029 3401 y Fw([)p Fs(l)1087 3360 y Fr(\003)1085 3426 y Fq(1)1127 3401 y Fs(\033)1186 3360 y Fr(\003)1182 3426 y Fq(1)1226 3401 y Fs(;)17 b(:)g(:)g(:)e(;)i(r)1491 3360 y Fr(\003)1488 3426 y Fq(2)1530 3401 y Fs(\033)1589 3360 y Fr(\003)1585 3426 y Fq(2)1629 3401 y Fw(])27 b(=)h Fs(C)1864 3360 y Fr(\003)1903 3401 y Fw([)p Fs(l)1961 3360 y Fr(\003)1959 3426 y Fq(1)2001 3401 y Fs(\033)2060 3360 y Fr(\003)2056 3426 y Fq(1)2100 3401 y Fs(;)17 b(:)g(:)g(:)e(;)2340 3376 y Fw(~)2318 3401 y Fs(C)2395 3360 y Fr(\003)2435 3401 y Fw([)p Fs(l)2493 3360 y Fr(\003)2491 3426 y Fq(1)2532 3401 y Fs(\033)2591 3360 y Fr(\003)2587 3426 y Fq(1)2631 3401 y Fs(;)i(:)g(:)g(:)f(;)h(l)2881 3360 y Fr(\003)2879 3426 y Fq(1)2920 3401 y Fs(\033)2979 3360 y Fr(\003)2975 3426 y Fq(1)3018 3401 y Fw(])257 3612 y(for)37 b(some)f(con)m(text)1033 3587 y(~)1011 3612 y Fs(C)1088 3576 y Fr(\003)1127 3612 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)h Fw(])36 b(whic)m(h)i(do)s(es)f(not)g (con)m(tain)f Fs(l)2501 3576 y Fr(\003)2499 3637 y Fq(1)2541 3612 y Fs(\033)2600 3576 y Fr(\003)2596 3637 y Fq(1)2639 3612 y Fw(.)57 b(Again,)37 b(b)m(y)h(Lemma)257 3732 y(4.9)g(w)m(e)h(ma) m(y)f(assume)h(that)f(the)g(marks)g(on)g(function)g(sym)m(b)s(ols)g(in) f Fs(r)2888 3696 y Fr(\003)2885 3757 y Fq(1)2927 3732 y Fw(,)j Fs(r)3041 3696 y Fr(\003)3038 3757 y Fq(2)3080 3732 y Fw(,)f Fs(x\033)3260 3696 y Fr(\003)3256 3757 y Fq(1)3338 3732 y Fw(and)257 3853 y Fs(y)t(\033)368 3817 y Fr(\003)364 3877 y Fq(2)438 3853 y Fw(\(for)31 b(all)e(extra)j(v)-5 b(ariables)30 b Fs(x)i Fw(and)f Fs(y)t Fw(\))g(are)g(pairwise)g(distinct)f(and)i(fresh)g(w.r.t.)43 b Fs(t)3428 3817 y Fr(\003)3468 3853 y Fw(.)257 3973 y(Observ)m(e)h(that)e(no)f(o)s(ccurrence)i(of)1643 3948 y(\026)1621 3973 y Fs(C)1698 3937 y Fr(\003)1737 3973 y Fw([)p Fs(r)1811 3937 y Fr(\003)1808 3998 y Fq(1)1850 3973 y Fs(\033)1909 3937 y Fr(\003)1905 3998 y Fq(1)1949 3973 y Fs(;)17 b(:)g(:)g(:)e(;)i(r)2214 3937 y Fr(\003)2211 3998 y Fq(1)2253 3973 y Fs(\033)2312 3937 y Fr(\003)2308 3998 y Fq(1)2352 3973 y Fw(])42 b(can)g(b)s(e)f(found)h(in)j(\026)-53 b Fs(s)3202 3937 y Fr(\003)3283 3973 y Fw(aside)257 4094 y(from)39 b(those)i(obtained)f(b)m(y)h(con)m(tracting)f(the)g(mark)m (ed)h(redex)g Fs(l)2661 4057 y Fr(\003)2659 4118 y Fq(1)2701 4094 y Fs(\033)2760 4057 y Fr(\003)2756 4118 y Fq(1)2839 4094 y Fw(b)s(ecause)h(w)m(e)f(use)257 4214 y(fresh)34 b(marks.)46 b(F)-8 b(or)33 b(the)h(same)f(reason,)h Fs(C)1824 4178 y Fr(\003)1864 4214 y Fw([)p Fs(;)17 b(:)g(:)g(:)f(;)2132 4189 y Fw(~)2110 4214 y Fs(C)2187 4178 y Fr(\003)2226 4214 y Fw([)p Fs(;)h(:)g(:)g(:)f(;)h Fw(]])33 b(do)s(es)h(not)f(con)m (tain)g Fs(l)3330 4178 y Fr(\003)3328 4239 y Fq(1)3370 4214 y Fs(\033)3429 4178 y Fr(\003)3425 4239 y Fq(1)3468 4214 y Fw(.)257 4334 y(No)m(w)h(if)d Fs(l)600 4298 y Fr(\003)598 4359 y Fq(1)640 4334 y Fs(\033)699 4298 y Fr(\003)695 4359 y Fq(1)771 4334 y Fw(is)h(not)g(a)g(subterm)h(of)1616 4316 y(\026)1614 4334 y Fs(t)1649 4298 y Fr(\003)1689 4334 y Fw(,)g(then)g(let)2113 4316 y(~)2112 4334 y Fs(t)2147 4298 y Fr(\003)2214 4334 y Fw(=)2319 4316 y(\026)2318 4334 y Fs(t)2353 4298 y Fr(\003)2392 4334 y Fw(.)44 b(Otherwise)33 b(de\014ne)1109 4527 y(~)1107 4545 y Fs(t)1142 4504 y Fr(\003)1210 4545 y Fw(=)27 b Fs(C)1390 4504 y Fr(\003)1430 4545 y Fw([)p Fs(r)1504 4504 y Fr(\003)1501 4570 y Fq(1)1543 4545 y Fs(\033)1602 4504 y Fr(\003)1598 4570 y Fq(1)1641 4545 y Fs(;)17 b(:)g(:)g(:)f(;)1882 4520 y Fw(~)1860 4545 y Fs(C)1937 4504 y Fr(\003)1976 4545 y Fw([)p Fs(r)2050 4504 y Fr(\003)2047 4570 y Fq(1)2089 4545 y Fs(\033)2148 4504 y Fr(\003)2144 4570 y Fq(1)2188 4545 y Fs(;)h(:)g(:)g(:)f(;)h(r) 2454 4504 y Fr(\003)2451 4570 y Fq(1)2493 4545 y Fs(\033)2552 4504 y Fr(\003)2548 4570 y Fq(1)2591 4545 y Fw(]])257 4771 y(and)39 b(observ)m(e)h(that)1025 4752 y(\026)1024 4771 y Fs(t)1059 4735 y Fr(\003)1136 4771 y Fu(\))1236 4716 y Fp(l)1258 4692 y Fk(\003)1257 4736 y Fl(1)1294 4716 y Fp(\033)1336 4692 y Fk(\003)1334 4736 y Fl(1)1236 4798 y Fr(R)1416 4752 y Fw(~)1414 4771 y Fs(t)1449 4735 y Fr(\003)1489 4771 y Fw(.)61 b(The)40 b(situation)d(is)h(depicted)h (in)f(Figure)f(5,)j(where)257 4891 y Fs(l)288 4855 y Fr(\003)286 4916 y Fq(2)328 4891 y Fs(\033)387 4855 y Fr(\003)383 4916 y Fq(2)454 4891 y Fw(=)580 4866 y(\026)558 4891 y Fs(C)635 4855 y Fr(\003)674 4891 y Fw([)p Fs(l)732 4855 y Fr(\003)730 4916 y Fq(1)772 4891 y Fs(\033)831 4855 y Fr(\003)827 4916 y Fq(1)870 4891 y Fs(;)17 b(:)g(:)g(:)f(;)h(l) 1120 4855 y Fr(\003)1118 4916 y Fq(1)1160 4891 y Fs(\033)1219 4855 y Fr(\003)1215 4916 y Fq(1)1258 4891 y Fw(])33 b Fu(\))1418 4906 y Fr(R)1536 4866 y Fw(~)1514 4891 y Fs(C)1591 4855 y Fr(\003)1631 4891 y Fw([)p Fs(l)1689 4855 y Fr(\003)1687 4916 y Fq(1)1728 4891 y Fs(\033)1787 4855 y Fr(\003)1783 4916 y Fq(1)1827 4891 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)2077 4855 y Fr(\003)2075 4916 y Fq(1)2116 4891 y Fs(\033)2175 4855 y Fr(\003)2171 4916 y Fq(1)2214 4891 y Fw(])28 b(=)g Fs(r)2420 4855 y Fr(\003)2417 4916 y Fq(2)2459 4891 y Fs(\033)2518 4855 y Fr(\003)2514 4916 y Fq(2)2557 4891 y Fw(.)404 5011 y(Next,)42 b(w)m(e)f(will)d(sho)m(w)j(that)1511 4986 y(\026)1489 5011 y Fs(C)1566 4975 y Fr(\003)1605 5011 y Fw([)p Fs(r)1679 4975 y Fr(\003)1676 5036 y Fq(1)1718 5011 y Fs(\033)1777 4975 y Fr(\003)1773 5036 y Fq(1)1817 5011 y Fs(;)17 b(:)g(:)g(:)e(;)i(r)2082 4975 y Fr(\003)2079 5036 y Fq(1)2121 5011 y Fs(\033)2180 4975 y Fr(\003)2176 5036 y Fq(1)2220 5011 y Fw(])40 b Fu(\))2387 5031 y Fr(R)2447 5012 y Fm(d)2447 5047 y(n)2556 4986 y Fw(~)2534 5011 y Fs(C)2611 4975 y Fr(\003)2650 5011 y Fw([)p Fs(r)2724 4975 y Fr(\003)2721 5036 y Fq(1)2763 5011 y Fs(\033)2822 4975 y Fr(\003)2818 5036 y Fq(1)2862 5011 y Fs(;)17 b(:)g(:)g(:)e(;)i (r)3127 4975 y Fr(\003)3124 5036 y Fq(1)3166 5011 y Fs(\033)3225 4975 y Fr(\003)3221 5036 y Fq(1)3265 5011 y Fw(].)65 b(T)-8 b(o)257 5132 y(this)45 b(end,)k(recall)44 b(that)h Fs(l)1215 5096 y Fr(\003)1213 5156 y Fq(2)1255 5132 y Fs(\033)1314 5096 y Fr(\003)1310 5156 y Fq(2)1402 5132 y Fw(=)1549 5107 y(\026)1527 5132 y Fs(C)1604 5096 y Fr(\003)1643 5132 y Fw([)p Fs(l)1701 5096 y Fr(\003)1699 5156 y Fq(1)1741 5132 y Fs(\033)1800 5096 y Fr(\003)1796 5156 y Fq(1)1840 5132 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)2090 5096 y Fr(\003)2088 5156 y Fq(1)2129 5132 y Fs(\033)2188 5096 y Fr(\003)2184 5156 y Fq(1)2227 5132 y Fw(])33 b Fu(\))2387 5151 y Fr(R)2447 5132 y Fm(d)2447 5168 y(n)2526 5132 y Fs(r)2573 5096 y Fr(\003)2570 5156 y Fq(2)2612 5132 y Fs(\033)2671 5096 y Fr(\003)2667 5156 y Fq(2)2711 5132 y Fw(.)81 b(Th)m(us,)50 b(for)44 b(ev)m(ery)257 5252 y Fs(s)303 5216 y Fr(\003)303 5277 y Fp(i)343 5252 y Fw(==)o Fs(t)529 5216 y Fr(\003)529 5277 y Fp(i)607 5252 y Fw(in)37 b Fs(c)768 5216 y Fr(\003)768 5277 y Fq(2)808 5252 y Fw(,)i(there)g(exist)f(mark)m(ed)h(ground)f (constructor)h(terms)e Fs(u)2907 5216 y Fr(\003)2907 5277 y Fp(i)2984 5252 y Fw(and)i Fs(v)3231 5216 y Fr(\003)3227 5277 y Fp(i)3308 5252 y Fw(suc)m(h)257 5373 y(that)47 b Fs(s)529 5336 y Fr(\003)529 5397 y Fp(i)569 5373 y Fs(\033)628 5336 y Fr(\003)624 5397 y Fq(2)699 5373 y Fu(\))799 5336 y Fr(\003)799 5410 y(R)859 5387 y Fm(d)859 5431 y(n)p Fk(\000)p Fl(1)984 5373 y Fs(u)1040 5336 y Fr(\003)1040 5397 y Fp(i)1079 5373 y Fw(,)k Fs(t)1192 5336 y Fr(\003)1192 5397 y Fp(i)1232 5373 y Fs(\033)1291 5336 y Fr(\003)1287 5397 y Fq(2)1363 5373 y Fu(\))1463 5336 y Fr(\003)1463 5410 y(R)1523 5387 y Fm(d)1523 5431 y(n)p Fk(\000)p Fl(1)1647 5373 y Fs(v)1698 5336 y Fr(\003)1694 5397 y Fp(i)1738 5373 y Fw(,)f(and)d Fs(u)2075 5336 y Fr(\003)2075 5397 y Fp(i)2166 5373 y Fu(\030)53 b Fs(v)2347 5336 y Fr(\003)2343 5397 y Fp(i)2386 5373 y Fw(.)87 b(Since)47 b Fu(R)g Fw(is)g(orthogonal,)1828 5637 y(20)p eop %%Page: 21 21 21 20 bop 1567 665 a Fs(t)1602 629 y Fr(\003)1730 665 y Fw(=)-17 b Fu(\))1889 629 y Fp(l)1911 606 y Fk(\003)1910 650 y Fl(2)1947 629 y Fp(\033)1989 606 y Fk(\003)1987 650 y Fl(2)2116 647 y Fw(\026)2114 665 y Fs(t)2149 629 y Fr(\003)1566 702 y Ft(w)1566 761 y(w)1566 821 y(\177)1643 804 y Fp(l)1665 781 y Fk(\003)1664 825 y Fl(1)1701 804 y Fp(\033)1743 781 y Fk(\003)1741 825 y Fl(1)2113 702 y Ft(w)2113 761 y(w)2113 821 y(\177)2191 804 y Fp(l)2213 781 y Fk(\003)2212 825 y Fl(1)2248 804 y Fp(\033)2290 781 y Fk(\003)2288 825 y Fl(1)1566 965 y Fw(\026)-53 b Fs(s)1608 929 y Fr(\003)2116 947 y Fw(~)2114 965 y Fs(t)2149 929 y Fr(\003)1663 1195 y Fw(Figure)31 b(5:)257 1475 y(for)52 b(ev)m(ery)j(o)s(ccurrence)f(of)e Fs(l)1371 1439 y Fr(\003)1369 1500 y Fq(1)1410 1475 y Fs(\033)1469 1439 y Fr(\003)1465 1500 y Fq(1)1509 1475 y Fw(,)57 b(there)d(is)e(a)g (v)-5 b(ariable)50 b Fs(x)63 b Fu(2)f(V)8 b Fs(ar)s Fw(\()p Fs(l)2947 1490 y Fq(2)2986 1475 y Fw(\))52 b(suc)m(h)i(that)257 1596 y Fs(x\033)371 1560 y Fr(\003)367 1620 y Fq(2)454 1596 y Fw(=)43 b Fs(C)650 1560 y Fr(\003)643 1620 y Fp(x)689 1596 y Fw([)p Fs(l)747 1560 y Fr(\003)745 1620 y Fq(1)787 1596 y Fs(\033)846 1560 y Fr(\003)842 1620 y Fq(1)886 1596 y Fs(;)17 b(:)g(:)g(:)e(;)i(l)1135 1560 y Fr(\003)1133 1620 y Fq(1)1175 1596 y Fs(\033)1234 1560 y Fr(\003)1230 1620 y Fq(1)1273 1596 y Fw(])42 b(con)m(tains)f(this)h(particular)d(o)s (ccurrence.)72 b(De\014ne)47 b(\026)-54 b Fs(\033)3311 1560 y Fr(\003)3307 1620 y Fq(2)3392 1596 y Fw(b)m(y)257 1716 y Fs(x)5 b Fw(\026)-54 b Fs(\033)371 1680 y Fr(\003)367 1741 y Fq(2)465 1716 y Fw(=)53 b Fs(C)671 1680 y Fr(\003)664 1741 y Fp(x)710 1716 y Fw([)p Fs(r)784 1680 y Fr(\003)781 1741 y Fq(1)823 1716 y Fs(\033)882 1680 y Fr(\003)878 1741 y Fq(1)922 1716 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)1188 1680 y Fr(\003)1185 1741 y Fq(1)1226 1716 y Fs(\033)1285 1680 y Fr(\003)1281 1741 y Fq(1)1325 1716 y Fw(])47 b(for)h(all)d (those)j(v)-5 b(ariables)47 b Fs(x)h Fw(and)f Fs(y)9 b Fw(\026)-54 b Fs(\033)2822 1680 y Fr(\003)2818 1741 y Fq(2)2914 1716 y Fw(=)53 b Fs(y)t(\033)3154 1680 y Fr(\003)3150 1741 y Fq(2)3241 1716 y Fw(other-)257 1837 y(wise.)64 b(No)m(w)40 b Fs(l)787 1800 y Fr(\003)785 1861 y Fq(2)832 1837 y Fw(\026)-54 b Fs(\033)886 1800 y Fr(\003)882 1861 y Fq(2)964 1837 y Fu(\))1064 1856 y Fr(R)1124 1837 y Fm(d)1124 1872 y(n)1210 1837 y Fs(r)1257 1800 y Fr(\003)1254 1861 y Fq(2)1301 1837 y Fw(\026)g Fs(\033)1355 1800 y Fr(\003)1351 1861 y Fq(2)1433 1837 y Fw(=)1570 1811 y(~)1548 1837 y Fs(C)1625 1800 y Fr(\003)1665 1837 y Fw([)p Fs(r)1739 1800 y Fr(\003)1736 1861 y Fq(1)1778 1837 y Fs(\033)1837 1800 y Fr(\003)1833 1861 y Fq(1)1876 1837 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)2142 1800 y Fr(\003)2139 1861 y Fq(1)2181 1837 y Fs(\033)2240 1800 y Fr(\003)2236 1861 y Fq(1)2279 1837 y Fw(].)64 b(In)40 b(order)f(to)g(see)h(this,)h (infer)257 1957 y(from)e(the)i(inductiv)m(e)f(h)m(yp)s(othesis)i(on)e Fs(`)g Fw(in)g(conjunction)g(with)g Fs(s)2748 1921 y Fr(\003)2748 1982 y Fp(i)2787 1957 y Fs(\033)2846 1921 y Fr(\003)2842 1982 y Fq(2)2918 1957 y Fu(\))3018 1921 y Fr(\003)3018 1994 y(R)3078 1971 y Fm(d)3078 2015 y(n)p Fk(\000)p Fl(1)3203 1957 y Fs(u)3259 1921 y Fr(\003)3259 1982 y Fp(i)3338 1957 y Fw(and)257 2100 y Fs(s)303 2064 y Fr(\003)303 2124 y Fp(i)343 2100 y Fs(\033)402 2064 y Fr(\003)398 2124 y Fq(2)474 2100 y Fu(\))574 2119 y Fr(R)634 2100 y Fm(d)634 2136 y(m)729 2100 y Fs(s)775 2064 y Fr(\003)775 2124 y Fp(i)819 2100 y Fw(\026)-54 b Fs(\033)873 2064 y Fr(\003)869 2124 y Fq(2)941 2100 y Fw(that)29 b(there)g(is)g(a)f(mark)m(ed)h(ground)g(constructor)g (term)35 b(\026)-55 b Fs(u)3033 2064 y Fr(\003)3033 2124 y Fp(i)3100 2100 y Fw(suc)m(h)30 b(that)257 2220 y Fs(s)303 2184 y Fr(\003)303 2245 y Fp(i)348 2220 y Fw(\026)-54 b Fs(\033)402 2184 y Fr(\003)398 2245 y Fq(2)474 2220 y Fu(\))574 2184 y Fr(\003)574 2257 y(R)634 2235 y Fm(d)634 2279 y(n)p Fk(\000)p Fl(1)765 2220 y Fw(\026)f Fs(u)815 2184 y Fr(\003)815 2245 y Fp(i)881 2220 y Fw(and)27 b Fs(u)1121 2184 y Fr(\003)1121 2245 y Fp(i)1188 2192 y Fu(\030)1189 2224 y Fw(=)1299 2220 y(\026)-55 b Fs(u)1349 2184 y Fr(\003)1349 2245 y Fp(i)1388 2220 y Fw(.)42 b(Analogously)-8 b(,)27 b(there)h(is)f(a)g(mark)m(ed)g(ground)g(construc-)257 2363 y(tor)37 b(term)j(\026)-53 b Fs(v)707 2327 y Fr(\003)703 2388 y Fp(i)784 2363 y Fw(suc)m(h)38 b(that)f Fs(t)1259 2327 y Fr(\003)1259 2388 y Fp(i)1304 2363 y Fw(\026)-54 b Fs(\033)1358 2327 y Fr(\003)1354 2388 y Fq(2)1430 2363 y Fu(\))1530 2327 y Fr(\003)1530 2400 y(R)1590 2377 y Fm(d)1590 2421 y(n)p Fk(\000)p Fl(1)1718 2363 y Fw(\026)h Fs(v)1765 2327 y Fr(\003)1761 2388 y Fp(i)1805 2363 y Fw(,)38 b(and)f Fs(v)2115 2327 y Fr(\003)2111 2388 y Fp(i)2189 2335 y Fu(\030)2190 2367 y Fw(=)2306 2363 y(\026)-53 b Fs(v)2353 2327 y Fr(\003)2349 2388 y Fp(i)2392 2363 y Fw(.)57 b(Hence)38 b(the)g(claim)c(follo)m(ws)257 2506 y(from)k(\026)-55 b Fs(u)544 2470 y Fr(\003)544 2530 y Fp(i)610 2506 y Fu(\030)28 b Fs(u)771 2470 y Fr(\003)771 2530 y Fp(i)838 2506 y Fu(\030)g Fs(v)994 2470 y Fr(\003)990 2530 y Fp(i)1061 2506 y Fu(\030)k Fw(\026)-53 b Fs(v)1217 2470 y Fr(\003)1213 2530 y Fp(i)1256 2506 y Fw(.)2135 b Fj(\003)257 2725 y Fo(Corollary)36 b(4.11)49 b Fv(F)-7 b(or)34 b(every)h Fs(n)28 b Fu(2)g Fi(N)9 b Fv(,)76 b Fu(\))1895 2745 y Fr(R)1955 2726 y Fm(d)1955 2761 y(n)2071 2725 y Fv(is)34 b(c)-5 b(on\015uent)35 b(mo)-5 b(dulo)2933 2698 y Fu(\030)2933 2730 y Fw(=)3010 2725 y Fv(.)257 2945 y(Pr)g(o)g(of)67 b Fw(Immediate)32 b(consequence)j(of)d(Lemma)f (4.10.)1171 b Fj(\003)257 3164 y Fo(Theorem)37 b(4.12)49 b Fv(F)-7 b(or)34 b(every)h Fs(n)28 b Fu(2)g Fi(N)9 b Fv(,)76 b Fu(\))1872 3179 y Fr(R)1932 3187 y Fm(n)2048 3164 y Fv(is)35 b(c)-5 b(on\015uent)35 b(mo)-5 b(dulo)2910 3137 y Fu(\030)2911 3169 y Fw(=)2987 3164 y Fv(.)257 3384 y(Pr)g(o)g(of)86 b Fw(Because)43 b(of)74 b Fu(\))1205 3403 y Fr(R)1265 3384 y Fm(d)1265 3420 y(n)1388 3384 y Fu(\022)j(\))1642 3399 y Fr(R)1702 3407 y Fm(n)1781 3384 y Fw(,)44 b(Prop)s(osition)c(4.13,)k(and)e(Lemma)f(4.9,)j(w)m(e) 257 3504 y(conclude)36 b(b)m(y)f(the)h(generalization)c(of)i(Staples')h (result)g(\(see)h(Section)f(2\))f(that)67 b Fu(\))3356 3519 y Fr(R)3416 3527 y Fm(n)257 3625 y Fw(is)32 b(con\015uen)m(t)i(mo) s(dulo)1125 3597 y Fu(\030)1126 3629 y Fw(=)1235 3625 y(if)d(and)i(only)f(if)64 b Fu(\))1950 3644 y Fr(R)2010 3625 y Fm(d)2010 3661 y(n)2122 3625 y Fw(is)32 b(con\015uen)m(t)i(mo)s (dulo)2989 3597 y Fu(\030)2990 3629 y Fw(=)3067 3625 y(.)324 b Fj(\003)257 3844 y Fo(Prop)s(osition)36 b(4.13)49 b Fv(If)25 b Fs(s)1250 3808 y Fr(\003)1325 3844 y Fu(\))1425 3808 y Fr(\003)1425 3870 y(R)1485 3878 y Fm(n)1566 3844 y Fs(t)1601 3808 y Fr(\003)1641 3844 y Fv(,)i(then)f(ther)-5 b(e)26 b(ar)-5 b(e)25 b(marke)-5 b(d)25 b(terms)h Fs(u)2947 3808 y Fr(\003)3012 3844 y Fv(and)f Fs(v)3243 3808 y Fr(\003)3308 3844 y Fv(such)257 3965 y(that)36 b Fs(s)503 3929 y Fr(\003)577 3965 y Fu(\))677 3929 y Fr(\003)677 3998 y(R)737 3979 y Fm(d)737 4015 y(n)818 3965 y Fs(u)874 3929 y Fr(\003)913 3965 y Fv(,)f Fs(t)1013 3929 y Fr(\003)1087 3965 y Fu(\))1187 3929 y Fr(\003)1187 3998 y(R)1247 3979 y Fm(d)1247 4015 y(n)1329 3965 y Fs(v)1380 3929 y Fr(\003)1419 3965 y Fv(,)g(and)f Fs(u)1729 3929 y Fr(\003)1796 3937 y Fu(\030)1797 3969 y Fw(=)1901 3965 y Fs(v)1952 3929 y Fr(\003)1991 3965 y Fv(.)257 4184 y(Pr)-5 b(o)g(of)49 b Fw(W)-8 b(e)23 b(pro)s(ceed)h(b)m(y)g(induction)e(on)h(the)g(depth)h Fs(n)f Fw(of)f Fs(s)2371 4148 y Fr(\003)2443 4184 y Fu(\))2543 4148 y Fr(\003)2543 4209 y(R)2603 4217 y Fm(n)2682 4184 y Fs(t)2717 4148 y Fr(\003)2757 4184 y Fw(.)40 b(The)24 b(prop)s(osition)257 4305 y(holds)29 b(v)-5 b(acuously)30 b(for)f Fs(n)f Fw(=)g(0.)42 b(So)29 b(let)g Fs(n)f(>)f Fw(0.)43 b(W)-8 b(e)29 b(pro)s(ceed)i(further)e(b)m(y)i(induction)d(on) 257 4425 y(the)e(length)f Fs(`)g Fw(of)f(the)i(reduction)f(sequence)j Fs(s)1908 4389 y Fr(\003)1980 4425 y Fu(\))2080 4389 y Fr(\003)2080 4450 y(R)2140 4458 y Fm(n)2219 4425 y Fs(t)2254 4389 y Fr(\003)2293 4425 y Fw(.)41 b(Again,)26 b(the)f(case)h Fs(`)i Fw(=)g(0)c(holds)257 4545 y(v)-5 b(acuously)d(.)47 b(Supp)s(ose)35 b(the)f(claim)e(is)h(true)h(for)f Fs(`)p Fw(.)47 b(In)34 b(order)g(to)f(sho)m(w)i(it)e(for)g Fs(`)23 b Fw(+)f(1,)34 b(w)m(e)257 4666 y(consider)g Fs(s)684 4630 y Fr(\003)752 4666 y Fw(=)28 b Fs(C)933 4630 y Fr(\003)973 4666 y Fw([)p Fs(l)1031 4630 y Fr(\003)1070 4666 y Fs(\033)1129 4630 y Fr(\003)1169 4666 y Fs(;)17 b(:)g(:)g(:)f(;)h(l)1419 4630 y Fr(\003)1458 4666 y Fs(\033)1517 4630 y Fr(\003)1557 4666 y Fw(])28 b Fu(\))1712 4630 y Fp(l)1734 4606 y Fk(\003)1770 4630 y Fp(\033)1812 4606 y Fk(\003)1712 4691 y Fr(R)1772 4699 y Fm(n)1881 4666 y Fs(C)1958 4630 y Fr(\003)1998 4666 y Fw([)p Fs(r)2072 4630 y Fr(\003)2111 4666 y Fs(\033)2170 4630 y Fr(\003)2209 4666 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)2475 4630 y Fr(\003)2514 4666 y Fs(\033)2573 4630 y Fr(\003)2612 4666 y Fw(])29 b(=)2774 4647 y(\026)2773 4666 y Fs(t)2808 4630 y Fr(\003)2876 4666 y Fu(\))2976 4630 y Fp(`)2976 4691 y Fr(R)3036 4699 y Fm(n)3111 4666 y Fs(t)3146 4630 y Fr(\003)3186 4666 y Fw(,)k(where)257 4786 y Fs(s)303 4750 y Fr(\003)375 4786 y Fu(\))475 4801 y Fr(R)535 4809 y Fm(n)616 4768 y Fw(\026)614 4786 y Fs(t)649 4750 y Fr(\003)720 4786 y Fw(b)m(y)g(a)e(mark)m(ed)h(v)m(ersion)g(of)f(the)h(rule)f Fs(\032)d Fw(:)g Fs(l)i Fu(!)d Fs(r)k Fu(\()c Fs(s)2649 4801 y Fq(1)2688 4786 y Fw(==)p Fs(t)2875 4801 y Fq(1)2915 4786 y Fs(;)17 b(:)g(:)g(:)32 b(;)17 b(s)3196 4801 y Fp(k)3238 4786 y Fw(==)p Fs(t)3425 4801 y Fp(k)3468 4786 y Fw(.)257 4907 y(W)-8 b(e)53 b(sho)m(w)g(that)f(there)h(are)g(mark)m (ed)f(terms)59 b(\026)-55 b Fs(u)2103 4870 y Fr(\003)2194 4907 y Fw(and)56 b(\026)-53 b Fs(v)2454 4870 y Fr(\003)2545 4907 y Fw(suc)m(h)54 b(that)e Fs(s)3062 4870 y Fr(\003)3134 4907 y Fu(\))3234 4926 y Fr(R)3294 4907 y Fm(d)3294 4942 y(n)3379 4907 y Fw(\026)-55 b Fs(u)3429 4870 y Fr(\003)3468 4907 y Fw(,)259 5009 y(\026)257 5027 y Fs(t)292 4991 y Fr(\003)365 5027 y Fu(\))465 5046 y Fr(R)525 5027 y Fm(d)525 5063 y(n)607 5027 y Fw(\026)j Fs(v)655 4991 y Fr(\003)694 5027 y Fw(,)40 b(and)45 b(\026)-55 b Fs(u)1013 4991 y Fr(\003)1090 4999 y Fu(\030)1091 5031 y Fw(=)1209 5027 y(\026)i Fs(v)1256 4991 y Fr(\003)1296 5027 y Fw(.)61 b(The)40 b(whole)f(claim)d(then)j(follo)m(ws)e(from)h(the)h(inductiv)m (e)257 5147 y(h)m(yp)s(othesis)g(on)f Fs(`)f Fw(in)g(com)m(bination)e (with)i(Corollary)f(4.11)h(and)h(Lemma)e(4.9.)58 b(Since)257 5268 y Fs(s)303 5232 y Fr(\003)375 5268 y Fu(\))475 5283 y Fr(R)535 5291 y Fm(n)616 5249 y Fw(\026)614 5268 y Fs(t)649 5232 y Fr(\003)689 5268 y Fw(,)36 b(there)g(are)g(mark)m(ed)f (ground)h(constructor)g(terms)f Fs(u)2701 5232 y Fr(\003)2701 5292 y Fp(i)2776 5268 y Fw(and)g Fs(v)3019 5232 y Fr(\003)3015 5292 y Fp(i)3094 5268 y Fw(suc)m(h)h(that)257 5388 y Fs(s)303 5352 y Fr(\003)303 5413 y Fp(i)343 5388 y Fs(\033)402 5352 y Fr(\003)474 5388 y Fu(\))574 5352 y Fr(\003)574 5413 y(R)634 5422 y Fm(n)p Fk(\000)p Fl(1)759 5388 y Fs(u)815 5352 y Fr(\003)815 5413 y Fp(i)854 5388 y Fw(,)f Fs(t)951 5352 y Fr(\003)951 5413 y Fp(i)991 5388 y Fs(\033)1050 5352 y Fr(\003)1122 5388 y Fu(\))1222 5352 y Fr(\003)1222 5413 y(R)1282 5422 y Fm(n)p Fk(\000)p Fl(1)1407 5388 y Fs(v)1458 5352 y Fr(\003)1454 5413 y Fp(i)1497 5388 y Fw(,)h(and)f Fs(u)1808 5352 y Fr(\003)1808 5413 y Fp(i)1879 5388 y Fu(\030)e Fs(v)2040 5352 y Fr(\003)2036 5413 y Fp(i)2079 5388 y Fw(.)51 b(By)36 b(the)g(inductiv)m(e)f(h)m(yp)s (othesis)h(on)1828 5637 y(21)p eop %%Page: 22 22 22 21 bop 257 573 a Fs(n)34 b Fw(and)f(the)g(fact)g(that)g Fs(u)1168 537 y Fr(\003)1168 597 y Fp(i)1240 573 y Fw(is)g(a)g(normal)e (form,)h(w)m(e)i(conclude)g(that)f(there)h(are)f(mark)m(ed)257 693 y(terms)54 b(\026)-55 b Fs(u)600 657 y Fr(\003)600 718 y Fp(i)686 693 y Fw(and)51 b(\026)-53 b Fs(v)941 657 y Fr(\003)937 718 y Fp(i)1028 693 y Fw(suc)m(h)48 b(that)f Fs(s)1534 657 y Fr(\003)1534 718 y Fp(i)1574 693 y Fs(\033)1633 657 y Fr(\003)1705 693 y Fu(\))1805 657 y Fr(\003)1805 730 y(R)1865 708 y Fm(d)1865 752 y(n)p Fk(\000)p Fl(1)1996 693 y Fw(\026)-55 b Fs(u)2046 657 y Fr(\003)2046 718 y Fp(i)2137 666 y Fu(\030)2138 697 y Fw(=)2268 693 y Fs(u)2324 657 y Fr(\003)2324 718 y Fp(i)2410 693 y Fw(and)47 b Fs(t)2649 657 y Fr(\003)2649 718 y Fp(i)2689 693 y Fs(\033)2748 657 y Fr(\003)2820 693 y Fu(\))2920 657 y Fr(\003)2920 730 y(R)2980 708 y Fm(d)2980 752 y(n)p Fk(\000)p Fl(1)3109 693 y Fw(\026)-53 b Fs(v)3156 657 y Fr(\003)3152 718 y Fp(i)3248 666 y Fu(\030)3249 697 y Fw(=)3378 693 y Fs(v)3429 657 y Fr(\003)3425 718 y Fp(i)3468 693 y Fw(.)257 842 y(Note)47 b(that)52 b(\026)-55 b Fs(u)788 805 y Fr(\003)788 866 y Fp(i)878 842 y Fu(\030)52 b Fs(u)1063 805 y Fr(\003)1063 866 y Fp(i)1153 842 y Fu(\030)g Fs(v)1333 805 y Fr(\003)1329 866 y Fp(i)1423 842 y Fu(\030)k Fw(\026)-53 b Fs(v)1603 805 y Fr(\003)1599 866 y Fp(i)1642 842 y Fw(.)85 b(So)47 b(if)e Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))51 b Fu(\022)g(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))q(,)50 b(then)d Fs(s)3110 805 y Fr(\003)3182 842 y Fu(\))3282 861 y Fr(R)3342 842 y Fm(d)3342 877 y(n)3422 823 y Fw(\026)3421 842 y Fs(t)3456 805 y Fr(\003)257 962 y Fw(and)g(the)h(claim)c(follo)m(ws.)85 b(Supp)s(ose)48 b(otherwise)g(that)e Fu(V)8 b Fs(ar)s Fw(\()p Fs(r)s Fw(\))52 b Fu(6\022)h(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))47 b(and)g(let)257 1082 y Fs(x)28 b Fu(2)h(E)9 b(V)e Fs(ar)s Fw(\()p Fs(\032)p Fw(\).)44 b(Then)32 b Fs(x)c Fu(2)h(V)8 b Fs(ar)s Fw(\()p Fs(t)1531 1097 y Fp(j)1567 1082 y Fw(\))32 b(for)f(some)h Fs(s)2075 1046 y Fr(\003)2075 1107 y Fp(j)2114 1082 y Fw(==)p Fs(t)2301 1046 y Fr(\003)2301 1107 y Fp(j)2340 1082 y Fw(.)44 b(Since)31 b Fs(t)2699 1046 y Fr(\003)2699 1107 y Fp(j)2739 1082 y Fs(\033)2798 1046 y Fr(\003)2870 1082 y Fu(\))2970 1046 y Fr(\003)2970 1120 y(R)3030 1097 y Fm(d)3030 1141 y(n)p Fk(\000)p Fl(1)3159 1082 y Fw(\026)-53 b Fs(v)3206 1046 y Fr(\003)3202 1107 y Fp(j)3273 1055 y Fu(\030)3274 1087 y Fw(=)3378 1082 y Fs(v)3429 1046 y Fr(\003)3425 1107 y Fp(j)3468 1082 y Fw(,)257 1225 y Fs(t)292 1189 y Fr(\003)292 1250 y Fp(j)379 1225 y Fw(is)47 b(a)f(mark)m(ed)i (constructor)f(term,)k(and)f(\026)-52 b Fs(v)2012 1189 y Fr(\003)2008 1250 y Fp(j)2098 1225 y Fw(is)46 b(a)h(mark)m(ed)g (ground)g(constructor)257 1346 y(term,)55 b(it)50 b(follo)m(ws)f(that)h Fs(x\033)1337 1309 y Fr(\003)1410 1346 y Fu(\))1510 1309 y Fr(\003)1510 1383 y(R)1570 1360 y Fm(d)1570 1404 y(n)p Fk(\000)p Fl(1)1698 1346 y Fw(\026)-52 b Fs(v)1746 1309 y Fr(\003)1742 1370 y Fp(x)1836 1346 y Fw(for)50 b(some)h(ground)f (constructor)i(subterm)261 1488 y(\026)-53 b Fs(v)308 1452 y Fr(\003)304 1513 y Fp(x)394 1488 y Fw(of)50 b(\026)-53 b Fs(v)570 1452 y Fr(\003)566 1513 y Fp(j)609 1488 y Fw(.)84 b(Note)46 b(that)g(ev)m(en)i(if)d Fs(x)h Fw(o)s(ccurs)h(more)e (than)h(once)h(in)e Fs(t)2845 1452 y Fr(\003)2845 1513 y Fp(j)2885 1488 y Fw(,)k(ev)m(ery)f(o)s(ccur-)257 1609 y(rence)41 b(of)d Fs(x\033)750 1573 y Fr(\003)829 1609 y Fw(in)g Fs(t)984 1573 y Fr(\003)984 1633 y Fp(j)1024 1609 y Fs(\033)1083 1573 y Fr(\003)1161 1609 y Fw(is)h(reduced)h(to)j (\026)-53 b Fs(v)1812 1573 y Fr(\003)1808 1633 y Fp(x)1891 1609 y Fw(b)s(ecause)40 b(redexes)h(with)e(iden)m(tical)e(marks)257 1729 y(are)42 b(shared)g(and)f(are)h(th)m(us)g(reduced)h(sim)m (ultaneously)d(b)m(y)75 b Fu(\))2660 1752 y Fr(R)2720 1729 y Fm(d)2720 1774 y(n)p Fk(\000)p Fl(1)2845 1729 y Fw(.)70 b(De\014ne)47 b(\026)-54 b Fs(\033)3312 1693 y Fr(\003)3392 1729 y Fw(b)m(y)257 1863 y Fs(x)5 b Fw(\026)-54 b Fs(\033)371 1827 y Fr(\003)465 1863 y Fw(=)56 b(\026)-52 b Fs(v)645 1827 y Fr(\003)641 1888 y Fp(x)732 1863 y Fw(for)47 b(ev)m(ery)j Fs(x)j Fu(2)h(E)9 b(V)f Fs(ar)s Fw(\()p Fs(\032)p Fw(\))47 b(and)h Fs(y)9 b Fw(\026)-54 b Fs(\033)2115 1827 y Fr(\003)2207 1863 y Fw(=)53 b Fs(y)t(\033)2447 1827 y Fr(\003)2533 1863 y Fw(for)47 b(ev)m(ery)j Fs(y)56 b Fu(2)e(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\).)257 1984 y(Let)50 b(\026)-53 b Fs(v)496 1948 y Fr(\003)586 1984 y Fw(=)50 b Fs(C)789 1948 y Fr(\003)829 1984 y Fw([)p Fs(r)903 1948 y Fr(\003)947 1984 y Fw(\026)-54 b Fs(\033)1001 1948 y Fr(\003)1040 1984 y Fs(;)17 b(:)g(:)g(:)f(;)h(r)1306 1948 y Fr(\003)1350 1984 y Fw(\026)-54 b Fs(\033)1404 1948 y Fr(\003)1443 1984 y Fw(].)84 b(Since)46 b Fs(z)t(\033)1957 1948 y Fr(\003)2048 1984 y Fw(=)k Fs(z)10 b Fw(\026)-55 b Fs(\033)2282 1948 y Fr(\003)2368 1984 y Fw(for)45 b(ev)m(ery)j Fs(z)55 b Fu(2)c(V)8 b Fs(ar)s Fw(\()p Fs(l)r Fw(\))46 b(and)257 2104 y Fs(z)t(\033)365 2068 y Fr(\003)438 2104 y Fu(\))538 2068 y Fr(\003)538 2141 y(R)598 2119 y Fm(d)598 2163 y(n)p Fk(\000)p Fl(1)723 2104 y Fs(z)10 b Fw(\026)-55 b Fs(\033)831 2068 y Fr(\003)905 2104 y Fw(for)34 b(ev)m(ery)i Fs(z)f Fu(2)c(E)9 b(V)e Fs(ar)s Fw(\()p Fs(\032)p Fw(\))35 b(w)m(e)g(deriv)m(e)2316 2086 y(\026)2315 2104 y Fs(t)2350 2068 y Fr(\003)2422 2104 y Fu(\))2522 2068 y Fr(\003)2522 2141 y(R)2582 2119 y Fm(d)2582 2163 y(n)p Fk(\000)p Fl(1)2710 2104 y Fw(\026)-52 b Fs(v)2758 2068 y Fr(\003)2831 2104 y Fw(\(taking)33 b(in)m(to)h(ac-)257 2253 y(coun)m(t)46 b(that)f Fs(z)t(\033)870 2216 y Fr(\003)955 2253 y Fw(gets)g(fresh)h (marks)e(for)h(ev)m(ery)h Fs(z)54 b Fu(2)49 b(E)9 b(V)e Fs(ar)s Fw(\()p Fs(\032)p Fw(\)\).)81 b(W)-8 b(e)45 b(claim)d(that)257 2373 y(also)f Fs(s)508 2337 y Fr(\003)580 2373 y Fu(\))680 2392 y Fr(R)740 2373 y Fm(d)740 2409 y(n)823 2373 y Fw(\026)-53 b Fs(v)870 2337 y Fr(\003)910 2373 y Fw(.)71 b(This)42 b(is)g(b)s(ecause)h(for)f(ev)m(ery)h Fs(i)p Fw(,)i(1)f Fu(\024)g Fs(i)g Fu(\024)g Fs(k)s Fw(,)g(w)m(e)f(can)g(conclude)257 2493 y Fs(s)303 2457 y Fr(\003)303 2518 y Fp(i)348 2493 y Fw(\026)-54 b Fs(\033)402 2457 y Fr(\003)474 2493 y Fu(\))574 2457 y Fr(\003)574 2531 y(R)634 2508 y Fm(d)634 2552 y(n)p Fk(\000)p Fl(1)765 2493 y Fw(~)f Fs(u)815 2457 y Fr(\003)815 2518 y Fp(i)881 2466 y Fu(\030)882 2498 y Fw(=)993 2493 y(\026)f Fs(u)1042 2457 y Fr(\003)1042 2518 y Fp(i)1113 2493 y Fw(\(for)32 b(some)38 b(~)-55 b Fs(u)1600 2457 y Fr(\003)1600 2518 y Fp(i)1639 2493 y Fw(\))32 b(from)e Fs(s)1984 2457 y Fr(\003)1984 2518 y Fp(i)2024 2493 y Fs(\033)2083 2457 y Fr(\003)2155 2493 y Fu(\))2255 2457 y Fr(\003)2255 2531 y(R)2315 2508 y Fm(d)2315 2552 y(n)p Fk(\000)p Fl(1)2446 2493 y Fw(\026)-55 b Fs(u)2496 2457 y Fr(\003)2496 2518 y Fp(i)2535 2493 y Fw(,)32 b Fs(s)2640 2457 y Fr(\003)2640 2518 y Fp(i)2679 2493 y Fs(\033)2738 2457 y Fr(\003)2810 2493 y Fu(\))2910 2457 y Fr(\003)2910 2531 y(R)2970 2508 y Fm(d)2970 2552 y(n)p Fk(\000)p Fl(1)3095 2493 y Fs(s)3141 2457 y Fr(\003)3141 2518 y Fp(i)3186 2493 y Fw(\026)-55 b Fs(\033)3239 2457 y Fr(\003)3279 2493 y Fw(,)32 b(and)257 2636 y(the)37 b(fact)e(that)68 b Fu(\))971 2659 y Fr(R)1031 2636 y Fm(d)1031 2681 y(n)p Fk(\000)p Fl(1)1192 2636 y Fw(is)36 b(con\015uen)m(t)h(mo)s(dulo)2070 2609 y Fu(\030)2070 2640 y Fw(=)2147 2636 y(.)53 b(Analogously)-8 b(,)36 b Fs(t)2839 2600 y Fr(\003)2839 2661 y Fp(i)2884 2636 y Fw(\026)-55 b Fs(\033)2937 2600 y Fr(\003)3009 2636 y Fu(\))3109 2600 y Fr(\003)3109 2673 y(R)3169 2651 y Fm(d)3169 2695 y(n)p Fk(\000)p Fl(1)3298 2636 y Fw(~)i Fs(v)3345 2600 y Fr(\003)3341 2661 y Fp(i)3418 2609 y Fu(\030)3419 2640 y Fw(=)261 2779 y(\026)g Fs(v)308 2743 y Fr(\003)304 2804 y Fp(i)348 2779 y Fw(.)74 b(It)43 b(then)g(follo)m(ws)f(from)48 b(~)-55 b Fs(u)1425 2743 y Fr(\003)1425 2804 y 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Fk(\003)1619 2933 y Fr(R)1679 2914 y Fm(d)1679 2949 y(n)1787 2899 y Fs(C)1864 2863 y Fr(\003)1903 2899 y Fw([)p Fs(r)1977 2863 y Fr(\003)2022 2899 y Fw(\026)-55 b Fs(\033)2075 2863 y Fr(\003)2115 2899 y Fs(;)17 b(:)g(:)g(:)f(;)h(r) 2381 2863 y Fr(\003)2425 2899 y Fw(\026)-54 b Fs(\033)2479 2863 y Fr(\003)2518 2899 y Fw(])28 b(=)j(\026)-53 b Fs(v)2727 2863 y Fr(\003)2766 2899 y Fw(.)625 b Fj(\003)404 3119 y Fw(In)43 b(con)m(trast)h(to)e(the)i(preceding)f(sections,)j(the)e (results)f(in)g(this)f(subsection)i(do)257 3240 y Fv(not)34 b Fw(extend)i(to)e(almost)e(orthogonal)h(systems.)49 b(This)35 b(can)f(b)s(e)g(seen)i(in)d(the)i(follo)m(wing)257 3360 y(example)d(tak)m(en)i(from)d([17].)257 3589 y Fo(Example)37 b(4.14)49 b Fw(In)33 b(the)g(almost)e(orthogonal)f(TRS)1316 3861 y Fu(R)f Fw(=)1532 3721 y Ft(\032)1648 3800 y Fs(f)11 b Fw(\()p Fs(x)p Fw(\))83 b Fu(!)g Fs(g)t Fw(\()p Fs(x;)17 b(x)p Fw(\))1653 3920 y Fs(f)11 b Fw(\()p Fs(a)p Fw(\))82 b Fu(!)h Fs(g)t Fw(\()p Fs(a;)17 b(a)p Fw(\))257 4143 y(w)m(e)56 b(ha)m(v)m(e)g Fs(f)729 4107 y Fq(0)769 4143 y Fw(\()p Fs(a)858 4107 y Fq(1)897 4143 y Fw(\))33 b Fu(\))1068 4158 y Fr(R)1164 4143 y Fs(g)1215 4107 y Fq(2)1254 4143 y Fw(\()p Fs(a)1343 4107 y Fq(1)1382 4143 y Fs(;)17 b(a)1477 4107 y Fq(1)1517 4143 y Fw(\))54 b(and)h Fs(f)1880 4107 y Fq(0)1920 4143 y Fw(\()p Fs(a)2009 4107 y Fq(1)2048 4143 y Fw(\))33 b Fu(\))2219 4158 y Fr(R)2315 4143 y Fs(g)2366 4107 y Fq(2)2405 4143 y Fw(\()p Fs(a)2494 4107 y Fq(3)2533 4143 y Fs(;)17 b(a)2628 4107 y Fq(4)2668 4143 y Fw(\))54 b(but)i Fs(g)3013 4107 y Fq(2)3051 4143 y Fw(\()p Fs(a)3140 4107 y Fq(1)3180 4143 y Fs(;)17 b(a)3275 4107 y Fq(1)3314 4143 y Fw(\))66 b Fu(6)3418 4116 y(\030)3419 4148 y Fw(=)257 4264 y Fs(g)308 4228 y Fq(2)347 4264 y Fw(\()p Fs(a)436 4228 y Fq(3)476 4264 y Fs(;)17 b(a)571 4228 y Fq(4)610 4264 y Fw(\).)404 4492 y(W)-8 b(e)33 b(conclude)g(this)f(section)h(with)f(a)g(simple)f(corollary)-8 b(.)257 4720 y Fo(Corollary)36 b(4.15)49 b Fv(F)-7 b(or)45 b(every)h Fs(n)j Fu(2)g Fi(N)9 b Fv(,)55 b(the)46 b(sets)g Fs(N)10 b(F)k Fw(\()35 b Fu(\))2552 4735 y Fr(R)2612 4743 y Fm(n)2693 4720 y Fw(\))46 b Fv(and)g Fs(N)10 b(F)k Fw(\()35 b Fu(\))3316 4740 y Fr(R)3376 4721 y Fm(d)3376 4756 y(n)3457 4720 y Fw(\))257 4841 y Fv(c)-5 b(oincide.)257 5069 y(Pr)g(o)g(of)65 b Fw(F)-8 b(ollo)m(ws)29 b(from)h(Theorem)h(4.4)g (\(2\),)g(Corollary)f(4.5)g(\(2\),)h(and)h(Lemma)d(3.11.)43 b Fj(\003)1828 5637 y Fw(22)p eop %%Page: 23 23 23 22 bop 257 573 a Fx(5)161 b(Concluding)53 b(Remarks)257 792 y Fw(In)26 b(this)e(pap)s(er)i(w)m(e)g(ha)m(v)m(e)g(considered)g (the)g(class)f(of)f Fv(almost)k(functional)c Fw(CTRSs.)43 b(It)25 b(has)257 912 y(b)s(een)39 b(sho)m(wn)g(that)f(graph)f (rewriting)g(is)g(adequate)i(for)e(sim)m(ulating)e(term)i(rewriting)257 1033 y(in)g(these)h(systems.)59 b(In)37 b(particular,)g(conditional)d (graph)j(rewriting)f(pro)m(v)m(ed)i(to)f(b)s(e)g(a)257 1153 y(sound)23 b(and)g(complete)e(implemen)m(tation)e(\(w.r.t.)k(the)f (computation)f(of)h(normal)e(forms\))257 1273 y(of)31 b(almost)f(functional)g(CTRSs.)44 b(F)-8 b(urthermore,)32 b(ev)m(ery)h(almost)d(functional)f(CTRS)k(is)257 1394 y(lev)m(el-con\015uen)m(t)39 b(and)f(the)h(same)e(holds)h(for)g(its)f (graph)h(implemen)m(tation.)57 b(All)36 b(these)257 1514 y(results)29 b(can)g(b)s(e)g(extended)i(to)d Fv(almost)j(ortho)-5 b(gonal)27 b Fw(systems)k(except)f(for)e(the)h(last)f(one.)404 1635 y(W)-8 b(e)34 b(stress)i(that)e(the)g(results)h(remain)d(v)-5 b(alid)33 b(if)g(w)m(e)i(con)m(tin)m(ue)g(to)e(allo)m(w)g(infeasible) 257 1755 y(conditional)d(critical)h(pairs.)42 b(A)33 b(conditional)d(critical)g(pair)1373 1972 y Fu(h)p Fs(C)7 b Fw([)p Fs(r)1560 1987 y Fq(2)1600 1972 y Fw(])p Fs(\033)n(;)17 b(r)1768 1987 y Fq(1)1807 1972 y Fs(\033)t Fu(i)28 b(\()f Fs(c)2102 1987 y Fq(1)2141 1972 y Fs(\033)n(;)17 b(c)2280 1987 y Fq(2)2320 1972 y Fs(\033)257 2189 y Fw(induced)34 b(b)m(y)f(an)g(o)m(v)m(erlap)f(of)g(the)h(t)m(w)m(o)h(conditional)c (rewrite)i(rules)h Fs(l)2791 2204 y Fq(1)2858 2189 y Fu(!)28 b Fs(r)3030 2204 y Fq(1)3097 2189 y Fu(\()f Fs(c)3266 2204 y Fq(1)3338 2189 y Fw(and)257 2309 y Fs(l)286 2324 y Fq(2)360 2309 y Fu(!)35 b Fs(r)539 2324 y Fq(2)613 2309 y Fu(\()f Fs(c)789 2324 y Fq(2)865 2309 y Fw(is)i(called)f Fv(infe)-5 b(asible)36 b Fw(if)f(the)i(condition)e Fs(c)2412 2324 y Fq(1)2452 2309 y Fs(\033)n(;)17 b(c)2591 2324 y Fq(2)2630 2309 y Fs(\033)41 b Fw(is)36 b(unsolv)-5 b(able.)55 b(F)-8 b(or)257 2430 y(example,)33 b(in)e(the)i(CTRS)482 2638 y Fs(spl)r(it)p Fw(\()p Fs(x;)17 b Fw([)34 b(]\))83 b Fu(!)27 b Fw(\([)32 b(])p Fs(;)17 b Fw([)33 b(]\))338 2759 y Fs(spl)r(it)p Fw(\()p Fs(x;)17 b(y)32 b Fw(:)c Fs(y)t(s)p Fw(\))82 b Fu(!)27 b Fw(\()p Fs(xs;)17 b(y)31 b Fw(:)d Fs(z)t(s)p Fw(\))g Fu(\()f Fs(x)h Fu(\024)g Fs(y)t Fw(==)o Fs(T)14 b(r)s(ue;)j(spl)r(it)p Fw(\()p Fs(x;)g(y)t(s)p Fw(\)==)o(\()p Fs(xs;)g(z)t(s)p Fw(\))338 2879 y Fs(spl)r(it)p Fw(\()p Fs(x;)g(y)32 b Fw(:)c Fs(y)t(s)p Fw(\))82 b Fu(!)27 b Fw(\()p Fs(y)k Fw(:)c Fs(xs;)17 b(z)t(s)p Fw(\))29 b Fu(\()e Fs(x)h Fu(\024)g Fs(y)t Fw(==)o Fs(F)14 b(al)r(se;)j(spl)r(it)p Fw(\()p Fs(x;)g(y)t(s)p Fw(\)==\()p Fs(xs;)g(z)t(s)p Fw(\))554 2999 y Fs(q)t(sor)s(t)p Fw(\([)33 b(]\))83 b Fu(!)27 b Fw([)33 b(])402 3120 y Fs(q)t(sor)s(t)p Fw(\()p Fs(x)27 b Fw(:)h Fs(xs)p Fw(\))84 b Fu(!)27 b Fs(q)t(sor)s(t)p Fw(\()p Fs(y)t(s)p Fw(\))21 b(+)-28 b(+)27 b(\()p Fs(x)h Fw(:)g Fs(q)t(sor)s(t)p Fw(\()p Fs(z)t(s)p Fw(\)\))g Fu(\()f Fs(spl)r(it)p Fw(\()p Fs(x;)17 b(xs)p Fw(\)==)q(\()p Fs(y)t(s;)g(z)t(s)p Fw(\))257 3330 y(the)33 b(conditional)d(critical)h(pair)404 3538 y Fu(h)p Fw(\()p Fs(xs;)17 b(y)30 b Fw(:)e Fs(z)t(s)p Fw(\))p Fs(;)17 b Fw(\()p Fs(y)31 b Fw(:)d Fs(xs)1209 3502 y Fr(0)1232 3538 y Fs(;)17 b(z)t(s)1371 3502 y Fr(0)1395 3538 y Fw(\))p Fu(i)27 b(\()83 b Fs(x)28 b Fu(\024)g Fs(y)t Fw(==)o Fs(T)14 b(r)s(ue;)j(spl)r(it)p Fw(\()p Fs(x;)g(y)t(s)p Fw(\)==)o(\()p Fs(xs;)g(z)t(s)p Fw(\))p Fs(;)1682 3659 y(x)28 b Fu(\024)g Fs(y)t Fw(==)o Fs(F)14 b(al)r(se;)j(spl)r(it)p Fw(\()p Fs(x;)g(y)t(s)p Fw(\)==\()p Fs(xs)3125 3623 y Fr(0)3148 3659 y Fs(;)g(z)t(s)3287 3623 y Fr(0)3311 3659 y Fw(\))257 3869 y(is)44 b(infeasible)e(b)s (ecause)j(the)f(condition)e Fs(x)47 b Fu(\024)g Fs(y)t Fw(==)o Fs(T)14 b(r)s(ue;)j(x)45 b Fu(\024)i Fs(y)t Fw(==)o Fs(F)14 b(al)r(se)44 b Fw(has)g(no)257 3989 y(solution.)404 4110 y(It)d(has)g(b)s(een)g(sho)m(wn)i(b)m(y)e(Suzuki)h(et)f(al.)e ([20])i(that)f(ev)m(ery)j(orthogonal)c(orien)m(ted)257 4230 y(3-CTRS)30 b(is)e(lev)m(el-con\015uen)m(t)i(pro)m(vided)g(it)e (is)h Fv(pr)-5 b(op)g(erly)31 b(oriente)-5 b(d)29 b Fw(and)g Fv(right-stable)p Fw(.)42 b(It)257 4351 y(is)e(quite)g(natural)e(to)i (ask)g(oneself)g(whether)h(graph)f(rewriting)e(is)i(an)f(adequate)i (im-)257 4471 y(plemen)m(tation)34 b(of)h(these)i(systems)g(to)s(o.)52 b(Our)35 b(pro)s(of)g(for)g(almost)f(functional)g(CTRSs)257 4591 y(hea)m(vily)h(dep)s(ends)i(on)e(the)h(fact)f(that)g(there)h (exists)g(a)f(closely)g(related)g(deterministic)257 4712 y(reduction)j(relation)e(whic)m(h)i(satis\014es)g(the)g(parallel)d(mo)m (v)m(es)j(lemma.)56 b(In)38 b(case)h(of)e(ori-)257 4832 y(en)m(ted)d(3-CTRSs,)f(ho)m(w)m(ev)m(er,)h(this)e(approac)m(h)h(do)s (esn't)f(w)m(ork.)45 b(Consider)32 b(for)g(example)257 4953 y(the)h(orthogonal)e(prop)s(erly)h(orien)m(ted)h(righ)m(t-stable)e (3-CTRS)1514 5161 y Fs(a)83 b Fu(!)27 b Fs(b)1524 5281 y(b)83 b Fu(!)27 b Fs(a)1523 5402 y(c)83 b Fu(!)27 b Fs(y)k Fu(\()c Fs(a)h Fu(!)g Fs(y)1828 5637 y Fw(23)p eop %%Page: 24 24 24 23 bop 257 573 a Fw(Then)43 b Fs(c)p Fu(!)663 588 y Fr(R)727 573 y Fs(a)f Fw(as)g(w)m(ell)f(as)h Fs(c)p Fu(!)1427 588 y Fr(R)1491 573 y Fs(b)g Fw(but)g Fs(c)g Fw(is)f(a)h(normal)e(form)g(w.r.t.)i Fu(!)2992 592 y Fr(R)3052 573 y Fm(d)83 b Fw(b)s(ecause)257 693 y(neither)39 b Fs(a)g Fw(nor)f Fs(b)h Fw(are)g(\(ground)f(constructor\))i(normal)c (forms.)61 b(So)39 b(the)g(question)g(of)257 814 y(whether)k(our)e (results)h(also)e(hold)h(for)g(orthogonal)e(prop)s(erly)i(orien)m(ted)h 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