New dynamical characterization of countable amenable groups
报告专家：张国华（复旦大学）
报告时间：2023年10月31日上午10：00
报告地点：西南中心505
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.
邀请人：连增
