Monday Analysis Seminar: On Popa’s Embedding Problem
 Date

2012116 14:45 
2012116 16:15
 Place
 Faculty of Science Buliding #3 Room 210

Speaker/Organizer
 Yasumichi Matsuzawa (Hokkaido Univ)

 In 2005, Sorin Popa initiated to study a Polish group which is isomorphic to a closed subgroup of the unitary group of a II_1factor. Such a group is called finite type. Popa introduced this class of groups to state his cocycle superrigidity theorem. A typical property of finite type groups is to have a compatible biinvariant metric. The question which we discuss in the talk is whether the converse is true. We start with definitions of basic notions and discuss about this question.