About Me
I am a PhD student in the field of Extremal Combinatorics at Freie Universität Berlin. My research interests include extremal graph theory, probabilistic methods in combinatorics, and related areas.
Publications
- On the chromatic number of powers of subdivisions of graphs, with Michael Anastos, Simona Boyadzhiyska, Juanjo Rué. Discrete Applied Mathematics, 2025.
Preprints
- The maximum diameter of 2-dimensional simplicial complexes, with Olaf Parczyk, Tibor Szabó, 2025.
Talks
- The maximum diameter of $d$-dimensional simplical complexes at Berlin-Poznań-Hamburg-Warsaw Seminar in Discrete Mathematics 2025, University of Passau, RS&A 2025, IBS Daejeon, and UPC Barcelona
- Extra-tight Euler trails in hypergraphs at Research Seminar FU Berlin
- What is a $k$-tensor? at What is...? Seminar Berlin
Teaching
- Teaching Assistant for Introduction to Formal Proof Verification with Lean, FU Berlin, Summer 2026.
- Teaching Assistant for Discrete Mathematics I, FU Berlin, Summer 2025.
- Teaching Assistant for Algorithmic Combinatorics, FU Berlin, Winter 2024/2025.
- Teaching Assistant for Discrete Mathematics I, FU Berlin, Summer 2024.
- Teaching Assistant for Extremal Combinatorics, FU Berlin, Winter 2023/2024.
- Teaching Assistant for Discrete Mathematics I, FU Berlin, Summer 2023.
- Teaching Assistant for Algorithmic Combinatorics, FU Berlin, Winter 2022/2023.
Outreach
Besides designing problems for the MATH+ Advent Calendar, I also serve as a grader for the Federal Competition Mathematics (Bundeswettbewerb Mathematik) and the national finals of the Mathematical Olympiad (Bundesrunde der Mathematik-Olympiade). Additionally, I prepare students for these competitions in regular seminars and weekly online classes.Contact
Department of Mathematics and Computer Science
Freie Universität Berlin
Arnimallee 3, 14195 Berlin, Germany
Email: s(dot)rathke(at)fu-berlin(dot)de