The Oberseminar is a meeting that takes place during every week of the semester to discuss and disseminate new research results.

Summer Semester 2026 - Thursday 2 p.m., Room 120

• 23/04/2026 Stefan Wewers, Resolution of cusps
• 30/04/2026 SWAG in Tübingen (joint seminar with the universities of Tübingen and Stuttgart)
• 06/05/2026  Michael Temkin, Wild Hurwitz spaces and level structures - GASTVORTRAG, Room: H14!
• 14/05/2026 Seminar entfällt - Feiertag (Christi Himmelfahrt)
• 21/05/2026 Maximilian Fülle, Hecke operators for Drinfeld modular forms of arbitrary rank

External Auditors (in case of virtual talks)

If you want to join an online talk, please ask us to send you the Zoom invitation. You can also register here for our mailing-list reine-announce@mawi.lists@uni-ulm.de to receive the Zoom invitation automatically. You will only have to click "Abonnieren" and then enter your email-address and name.

Summer Semester 2025 - Thursday 2 p.m., Room 120

• 15/05/2025 Stefan Wewers, Etale cohomology: what is it and why do we need it? (I)
• 22/05/2025 Stefan Wewers, Etale cohomology: what is it and why do we need it? (II)
• 26/06/2025 Xiaodong Zhang, Weil-Deligne Representation via Semistable Reduction
• 03/07/2025 Max Schwegele, Semistable reduction of smooth plane quartics
• 17/07/2025 Robert Nowak, How to compute L-factors and conductor exponents of genus 2 curves at p=2
• 24/07/2025 Stefan Wewers, Computing the semistable reduction of plane quartics

Winter Semester 2024/25 - Thursday 4 p.m., Room E60

• 16.01.2025: Kletus Stern, MacLane valuations
• 30.01.2025: Robert Nowak, The Epp problem for p-cyclic extensions
• 06.02.2025: Max Schwegele, The arithmetic genus via coherent cohomology
• 13.02.2025: Stefan Wewers, Semistable reduction and the moduli space of curves of genus 3

Summer Semester 2024 - Thursday 2 p.m., Room 120

• 19.12.2024: Xiaodong Zhang, Model with reduced special fibre
• 12.12.2024: Max Schwegele, The proof of Theorem I
• 05.12.2024: Miriam Ni-Chobhthaigh, Models of curves and valutations
• 21.11.2024: Irene Bouw, Galois representations of curves and stable reduction
• 14.11.2024: Stefan Wewers, Superelliptic curves of degree p and the deltafunction (II)
• 07.11.2024: Stefan Wewers, Superelliptic curves of degree p and the deltafunction (I)
• 26.09.2024: Hiroaki Nakamura, A two-parameter family of tropical elliptic curves arising from Edwards curve
• 11.07.2024: Robert Nowak, Monodromy extensions of genus 2 curves in residue characteristic 2 with equidistant branch locus
• 13.06.2024: Tim Gehrunger, Reduction types of genus 2 curves in residue characteristic 2
• 06.06.2024: Andreas Pieper, Reduction of plane quartics and Cayley Octads
• 23.05.2024: Jeroen Sijsling, Modularity in genus 2
• 16.05.2024: Xiaodong Zhang, On q-Weil Numbers, Part II
• 25.04.2024: Miriam Ni-Chobhthaigh, Selmer groups and their structure over dihedral extensions
• 19.04.2024 (Friday, Room E.04 in HeHo22): Yufei Qian, The moduli space of principally polarized abelian varieties and its toroidal compactification

Winter Semester 2023/24 - Thursday, 4 p.m., Room E60

• 29.02.2024, Xiaodong Zhang, On q-Weil numbers, Part I
• 28.02.2024, Raum E20: Irene Bouw, Abelsche Varietäten über endlichen Körpern
• 22.02.2024: Tim Evink, An equivalence of 2^n-descent and 2^(n-1)-descent using visualisation of Sh[2]
• 15.02.2024: Irene Bouw, Abelian varieties over finite fields
• 25.01.2024: Robert Nowak, Classifying reduction types of genus 2 hyperelliptic curves to characteristic 2 with equidistant branch locus
• 21.12.2023: Sabrina Kunzweiler, Modular polynomials via Kani's theorem
• 01.12.2023: Stefan Wewers, Models of hypersurfaces and BT buildings
• 23.11.2023: Stefan Wewers, Instabilities of hypersurfaces
• 16.11.2023: Valentijn Karemaker, When is a polarised abelian variety determined by its p-divisible group?
• 09.11.2023: Leolin Nkuete, Maximal curves of genus 5
• 02.11.2023: Jeroen Sijsling, Fundamentalgruppen und Überlagerungen
• 28.09.2023: Andreas Pieper, The equation of a genus 4 curve from its theta constants