Research keywords (9)：
Graph theory
, 離散群
, discrete groups
, CAT(0) groups and CAT(0) spaces
, reflection groups
, グラフ理論
, Coxeter groups
, Topology
, Geometric group theory
Research theme for competitive and other funds (3)：
2018 - 2022 Research on geodesic spaces of non-positive curvature on that groups act, infinite Coxeter groups and finite graphs
2013 - 2017 Research on spaces of non-positive curvature, their isometry groups and Coxeter groups
2009 - 2013 Research on spaces of non-positive curvature with group actions and Coxeter groups
Papers (29)：
Tetsuya Hosaka. The Reconstruction Conjecture for finite simple graphs and associated directed graphs. Discrete Mathematics. 2022. 7. 1-20
