Hiroki Ishikura 石倉宙樹
I am a postdoctoral researcher at Alfréd Rényi Institute of Mathematics in Hungary.
I received my PhD in 2026 from the University of Tokyo under the supervision of Yoshikata Kida.
Email: ishikura.hiroki [at] renyi.hu (My previous email address at RIMS is still valid)
Research interest: measured group theory, geometric group theory and Borel combinatorics
Talks
2026
Soficity of unimodular random planar graphs, Recent Developments in Operator Algebras, Kyoto University, 11 Sep
Planar Borel complexes and soficity, Kyoto Operator Algebra Seminar, Kyoto University, 26 Jun
Unimodular random graphs and Borel combinatorics, Logic seminar / Geometry seminar, Tohoku University, 19 Jun
Borel planar complexes and soficity, Operator Algebra Seminar, the University of Tokyo, 16 Jun
2025
Stallings-Swan's theorem for Borel graphs, TMU geometry seminar, Tokyo Metropolitan University, 19 Dec
Stallings-Swan's theorem for Borel graphs, Differential Topology Seminar, Kyoto University, 16 Dec
Unimodular random graphs and soficity, 9th workshop on geometric group theory, Kagoshima University, 4 Dec
Stallings-Swan's theorem for Borel graphs, Descriptive Dynamics and Combinatorics Seminar, McGill University, 21-22 Oct
Stallings-Swan's theorem for Borel graphs, MSJ Autumn Meeting, Nagoya University, 18 Sep
Stallings-Swan's theorem for Borel graphs, Tuesday Seminar on Topology, the University of Tokyo, 8 Jul
2024
Tree decomposition of Borel graphs and a Stallings-Swan theorem, Workshop on Operator Theory and Operator Algebras, Nagoya University, 23 Nov
Permutation stability of free metabelian groups, Stability learning group (online), Tel Aviv University, 25 Jul
2023
Permutation stability of free metabelian groups, Recent Developments in Operator Algebras, Kyoto University, 11 Sep
Permutation stability of free metabelian groups, Topological Studies around Riemann Surfaces, the University of Tokyo, 22 Aug
Permutation stability of free metabelian groups, New Aspects of Teichmüller theory, the University of Tokyo, 14 Jul
Permutation stability and invariant random subgroups, Kyoto Operator Algebra Seminar, Kyoto University, 16 May
2022
Permutation stability of finitely generated free metabelian groups, Operator Algebra Seminar, the University of Tokyo, 1 Nov