报告人:张国华
报告地点:数学与统计学院104室
报告时间:2023年10月25日星期三15:00-16:00
邀请人:冀书关
报告摘要:
Since von Neumann studied the well-known Banach-Tarski paradox in 1929, till now there are many characterizations for amenable groups. In this talk I will report a new characterization of countable amenable groups from the viewpoint of dynamical system. Namely we introduce a new concept called multiorder, and prove that a countable group G is amenable if and only if there exists a multiorder on G. I will also discuss briefly some applications of this new characterization. The talk is based on joint works with Downarowicz, Huczek, Oprocha and Wiecek.
主讲人简介:
张国华,2007年7月博士毕业于中国科学技术大学数学系(现为数学科学学院),2013年起任职复旦大学数学科学学院教授,国家优青获得者。研究方向是拓扑动力系统,主要研究动力系统的复杂性理论和可数离散群作用动力系统的熵理论。在Memoirs Amer. Math. Soc., J. Reine Angew. Math., Adv. Math., Ergod. Th. Dynam. Systems, J. Mod. Dyn., J. Funct. Anal., J. Differential Equations等国际知名刊物上发表论文。