Speaker: Xin Ma (Harbin Institute of Technology)
Time: Jun-10 14:30
Location: R1310, SIMIS
摘要：
In this talk, I will demonstrate topological freeness of the actions on the visual boundary of a proper CAT(0) space and on the Roller boundary of a proper CAT(0) cube complex by a group with a rank-one element. Then I will show their applications to C*-algebras such as C*-simplicity of groups and regularity properties, such as pure infiniteness, of crossed product C*-algebras. This is based on a joint work with Daxun Wang and Wenyuan Yang.
About Speaker:
Xin Ma is currently a faculty member in the Institute for Advanced Study in Mathematics of HIT. His research interests are mainly in Dynamical systems, Operator algebras, Geometric group theory, Model theory, and their interplay with Non-commutative geometry, Ergodic theory, Geometric topology, and Descriptive set theory. He has published papers in many top-tier journals, such as Trans. Amer. Math. Soc., Int. Math. Res. Not., J. Funct. Anal., etc.
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