讲座题目：Popa’s averaging property for automorphisms on C*-algebras
主讲人：Mikael Rordam 教授
主持人🦛：王勤 教授
开始时间👰🏿♀️：2024-07-30 14:50
讲座地址：ZOOM: 875 8150 5015，Password: 982213
主办单位：数学科学学院
报告人简介：
Mikael Rørdam教授是上海光辉娱乐平台荣誉教授、丹麦皇家科学院院士、哥本哈根大学教授♈️，国际算子代数研究领域的领军人物。Rørdam教授长期致力于算子代数、动力系统、几何群论、K-理论等领域的研究，其研究成果发表在Annals of Mathematics, Acta Mathematica等顶尖的数学杂志上，文章总引用率达2800多次。由于在C*-代数的结构和分类理论中的卓越工作，2006年，Rørdam教授应邀在马德里召开的第25届国际数学家大会（ICM）上作特邀报告🌕⛏。
报告内容：
In his study of the relative Dixmier property for von Neumann algebras and C*-algebras, Popa introduced a property of an automorphism, which can be thought of as a twisted Dixmier averaging property. We give an almost complete characterization of when an automorphism has this property. We further show how one can use this property to give much easier and more transparent proofs of a number of results on the inclusion of a C*-algebra into its crossed product C*-algebra by a group of automorphisms, assuming the automorphisms have averaging property.
