Stefan Kober

Short CV:

I'm a Postdoctoral Researcher with Prof. Samuel Fiorini at Université Libre de Bruxelles within the Algorithms Research Group and the Algebra and Combinatorics Group since September 2023.

I finished my Master of Science and my PhD at Technical University of Munich in Mathematics under the supervision of Prof. Stefan Weltge and Prof. Maximilian Schiffer in July 2023. During my PhD, I was part (and PhD representative) of the DFG research training group AdONE (Advanced Optimization in a Networked Economy).

My main research interest is in the field of Combinatorial Optimization, and more specifically on topics relating to Integer Programming, Graphs, Matroids, and Game Theory.

Papers:

Totally Δ-modular IPs with two non-zeros in most rows.
Kober, S. (2025).
In: Megow, N., Basu, A. (eds) Integer Programming and Combinatorial Optimization. IPCO 2025. Lecture Notes in Computer Science, vol 15620 (pp 355–370). Springer, Cham.
[preprint] [conference version]
Face covers and rooted minors in bounded genus graphs.
with Fiorini, S., Seweryn, M. T., Shantanam, A., and Yuditsky, Y. (2025).
arXiv preprint arXiv:2503.09230.
[preprint]
Integer programs with nearly totally unimodular matrices: the cographic case.
with Aprile, M., Fiorini, S., Joret, G., Seweryn, M. T., Weltge, S., and Yuditsky, Y. (2025).
In Proceedings of the 2025 Annual ACM-SIAM Symposium on Discrete Algorithms (SODA) (pp. 2301-2312). Society for Industrial and Applied Mathematics.
[preprint] [conference version] [slides]
Total Matching and Subdeterminants.
with Ferrarini, L., Fiorini, S., and Yuditsky, Y. (2024).
In Basu, A., Mahjoub, A.R., Salazar González, J.J. (eds) Combinatorial Optimization. ISCO 2024. Lecture Notes in Computer Science, vol 14594.
[preprint] [conference version] [slides]
Superiority of Instantaneous Decisions in Thin Dynamic Matching Markets.
with Bäumler, J., Bullinger, M., and Zhu, D. (2023).
In Proceedings of the 24th ACM Conference on Economics and Computation (EC '23). Association for Computing Machinery, New York, NY, USA, 390.
[preprint] [conference version] [repository]
Driver-aware charging infrastructure design.
with Schiffer, M., Sorgatz, S., and Weltge, S. (2022).
arXiv preprint arXiv:2212.05084.
[preprint] [repository]
Loyalty in Cardinal Hedonic Games.
with Bullinger, M. (2021).
In Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence.
[conference version]
Improved lower bound on the dimension of the EU council’s voting rules.
with Weltge, S. (2021).
Optimization Letters, 15, 1293-1302.
[preprint] [published] [slides]

Theses:

PhD Thesis: Kober, S. A. (2023). Three perspectives on integer programming: practical and theoretical applications, and the case of bounded subdeterminants (Doctoral dissertation, Technische Universität München). Supervised by S. Weltge and M. Schiffer. [link]
Master Thesis: Kober, S. (2019). On Hierarchies for Set Covering Problems (Master's Thesis, Technische Universität München). Supervised by S. Weltge. [link] [repository]
Bachelor Thesis: Kober, S. (2016). Classification of local fields (Bachelor's Thesis, Technische Universität München). Supervised by E. Viehmann.

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