Publications
2026
Relative simplicity of the universal coverings of transformation groups and Tsuboi's metric
Morimichi Kawasaki, Mitsuaki Kimura, Hiroki Kodama, Yoshifumi Matsuda, Takahiro Matsushita, Ryuma Orita — Journal of Topology and Analysis, Online Ready
2025
Topological complexity of monotone symplectic manifolds
Ryuma Orita — Tokyo Journal of Mathematics, vol. 48 (2025), no. 1, pp. 217-230
2023
Floer-type bipersistence modules and rectangle barcodes
Kanta Koeda, Ryuma Orita, Kanon Yashiro — arXiv:2312.07847
2022
Rigid fibers of integrable systems on cotangent bundles
Morimichi Kawasaki, Ryuma Orita — Journal of the Mathematical Society of Japan, vol. 74 (2022), no. 3, pp. 829–847
Linear Mathematics, Third Edition (Japanese)
Tamaki Tanaka, Hideo Kojima, Akinari Hoshi, Ryuma Orita, Nobuhiro Innami, Hisao Yoshihara — Baifukan
2020
Existence of pseudoheavy fibers of moment maps
Morimichi Kawasaki, Ryuma Orita — Communications in Contemporary Mathematics, vol. 23 (2021), no. 5, 2050047
On the existence of infinitely many non-contractible periodic orbits of Hamiltonian diffeomorphisms of closed symplectic manifolds
Ryuma Orita — Journal of Symplectic Geometry, vol. 17 (2019), no. 6, pp. 1893–1927
2019
Disjoint superheavy subsets and fragmentation norms
Morimichi Kawasaki, Ryuma Orita — Journal of Topology and Analysis, vol. 13 (2021), no. 2, pp. 443–468
2018
Application of fragmentation norms to transported points by Hamiltonian isotopies
Morimichi Kawasaki, Ryuma Orita — RIMS Kôkyûroku, vol. 2098 (2018), pp. 57–59
2017
Morse-Bott inequalities for manifolds with boundary
Ryuma Orita — Tokyo Journal of Mathematics, vol. 41 (2018), no. 1, pp. 113–130
Non-contractible periodic orbits in Hamiltonian dynamics on tori
Ryuma Orita — Bulletin of the London Mathematical Society, vol. 49 (2017), no. 4, pp. 571–580
Computation of annular capacity by Hamiltonian Floer theory of non-contractible periodic trajectories
Morimichi Kawasaki, Ryuma Orita — Journal of Modern Dynamics, vol. 11 (2017), pp. 313–339