Conferences - Seminars
16:15 ME D0 1418
By Prof. Stefan SAUTER (University of Zürich, Switzerland)
13:00-14:00 MA 12
When does a group virtually admit a faithful C^2 action on the circle? We provide an obstruction using a RAAG. Examples include all (non-virtually-free) mapping class groups, Out(Fn) and Torelli groups. This answers a question by Farb. (Joint work with Hyungryul Baik and Thomas Koberda) Read more about "Obstruction for a virtual C^2 action on the circle"
By Sang-Hyun Kim Seoul National University