2 papers
math.DG2026
Hurwitz-Radon numbers and proper actions of semisimple Lie groups
Kazuki Kannaka, Koichi Tojo
We study proper isometric actions of non-compact semisimple Lie groups on pseudo-Riemannian symmetric spaces. Motivated by Okuda's classification of semisimple symmetric spaces adm…
math.DG2025
Zariski dense discontinuous surface groups for reductive symmetric spaces
Kazuki Kannaka, Takayuki Okuda, Koichi Tojo
Let be a homogeneous space of reductive type with non-compact . The study of deformations of discontinuous groups for was initiated by T.~Kobayashi. In this paper, w…