Hello everyone,

Tomorrow, we have Danny Calegari joining us. His title and abstract are below. The zoom link for the seminar is below. Also, I will be in MSCS 445 and plan to have the talk projected there for those interesting in watching the talk with other people.

Neil Hoffman is inviting you to a scheduled Zoom meeting.

Topic: Okstate Topology Seminar

Time: This is a recurring meeting Meet anytime

Join Zoom Meeting

https://zoom.us/j/94529451960?pwd=ekkxYUsrRGt5bVdEQWJRN0JOZ04wZz09

Meeting ID: 945 2945 1960

Passcode: JSJDecomp

Join by Skype for Business

https://zoom.us/skype/94529451960

Homological stability of some big mapping class groups

Speaker: Danny Calegari, University of Chicago

Date: Sep 13, 2022

Time: 3:30 PM

Room: Virtual meeting

Abstract: Many surfaces of infinite type satisfy a kind of topological stability: the operation of boundary summing with certain surfaces of infinite type does not change their homeomorphism type. This phenomenon is often reflected in homological stability for mapping class groups, and gives techniques to help compute their homology. We illustrate this method with an example where it gives a complete answer: the homology of the mapping class group of the disk (resp. plane) minus a Cantor set is trivial (resp. is isomorphic to the homology of CP∞). This is joint work with Lvzhou Chen and Nathalie Wahl. This is a virtual talk. Contact Neil Hoffman for the zoom link

______________________

Neil R. Hoffman

Assistant Professor

Department of Mathematics

523 Math Science Building

Oklahoma State University

Stillwater, OK 74078-1058

405-744-7791

http://math.okstate.edu/people/nhoffman