Constantin Greif, M. Sc.

Short CV:

• Oct. 2012 - Sep. 2015: Bachelor of Science, Mathematics and Management, Ulm University
• Aug. 2016 - May 2017: Master of Science, Mathematics, University of Wisconsin-Milwaukee (USA)
• Oct. 2015 - March 2019: Master of Science, Mathematics, Ulm University
• Since Oct. 2018: Scientific Employee, Institute for Numerical Mathematics, Ulm University
• Since April 2019: Ph.D. student, Institute for Numerical Mathematics, Ulm University

• Model Order Reduction (Summer term: 2023)
• Numerical Optimization (Winter term: ’21/’22)
• Numerical Methods for Ordinary Differential Equations (Summer term: 2022)
• Numerical Methods for Partial Differential Equations (Summer term: 2021, winter term: ’22/’23)
• Introduction to High Performance Computing (Winter term: ’23/’24)
• High Performance Computing I (Winter term: '18/'19, '19/'20, '20/'21)
• High Performance Computing II (Summer term: 2019, 2020)

Research Fields:

• N-widths of parametric PDEs.
• Approximation methods using ridge functions.
• Reduced Basis Methods for parametric PDEs.
• Numerical methods for Hamilton-Jacobi-Bellman equations.

1. Decay of the Kolmogorov N-width for wave problems, Constantin Greif and Karsten Urban, Appl. Math. Lett., 2019.
2. Linear/Ridge expansions: Enhancing linear approximations by ridge functions, Constantin Greif, Philipp Junk, and Karsten Urban, Advances in Computational Mathematics, 2022.
3. The Kolmogorov N-width for linear transport: Exact representation and the influence of the data, Florian Arbes, Constantin Greif, and Karsten Urban, Advances in Computational Mathematics, 2025.

• Numerical Methods for Hamilton–Jacobi–Bellman Equations, Supervisor: Prof. Dr. Bruce A. Wade, University of Wisconsin–Milwaukee (USA), May 2017.
• Numerische Methoden zum Lösen der Hamilton–Jacobi–Bellman Gleichung für den Intraday-Handel mit Strom, Supervisors: Prof. Dr. Karsten Urban and Dr. Silke Glas, Ulm University (Germany), October 2018.

• Model Reduction of Parametrized Systems IV. 10-13 April 2018, Nantes (France).
• Model Order Reduction Summer School 2019. 23-27 September 2019, Eindhoven (Netherlands). Talk given.
• Low-Rank Models 2020. 12-17 January 2020, Villars-sur-Ollon (Switzerland). Poster presented.
• WCCM & ECCOMAS Congress 2021. 11-15 January 2021, virtual. Talk given.
• SIAM Conference on Computational Science and Engineering. 1-5 March 2021, virtual. Talk given.
• pyMOR School 2021. 4-8 October 2021, Münster (Germany).
• Young Mathematicians in Model Order Reduction (YMMOR) 2022. 18–22 July 2022, Münster (Germany). Talk given.
• YMMOR Conference 2023. 20–24 March 2023, Ulm (Germany). Talk given; co-organized.
• Structure-Preserving Numerical Methods for Partial Differential Equations. 3–7 July 2023, Lausanne (Switzerland). Talk given.
• YMMOR Conference 2024. 4–8 March 2024, Stuttgart (Germany). Talk given.
• YMMOR Conference 2025. 5–9 May 2025, Trieste (Italy). Talk given.