报告题目 (Title)：复双曲等距群中的乘子刚性
报告人 (Speaker)： 杨世海 教授（上海财经大学）
报告时间 (Time)：2021年11月17日(周三) 9:00
报告地点 (Place)：线上腾讯会议，会议 ID：376 424 443
邀请人(Inviter)：姚锋平
报告摘要：In this talk, we will first give a brief introduction of the boundary rigidity problem in the hyperbolic isometric group. Then we discuss the relations between the multiplier of an isometry and its corresponding matrix trace and show that a homomorphism in PU(2,1) which stretches each multiplier by a uniform constant is in fact multiplier-preserving. At last some problems related to ergordic rigidity are given. This is a joint work with Wang Liudeng.