## Topology Seminar: Ian Hambleton

• Date: 04/05/2017
• Time: 15:15
Lecturer(s):
Ian Hambleton, McMaster University
Location:

University of British Columbia

Topic:

Group actions on homology 3-spheres

Description:

I will discuss finite group actions on integral or rational homology 3-spheres. The main examples for this talk are the Brieskorn integral homology 3-spheres M(p,q,r) arising from isolated singularities, which bound smooth 4-manifolds with definite intersection forms. In addition, there are special infinite families of Brieskorn homology 3-spheres which can be realized as boundaries of smooth contractible 4-manifolds. We ask whether the free periodic actions on Brieskorn spheres extend to smooth actions with isolated fixed points on one of these associated 4-manifolds.

Other Information:

Location: ESB 4133 (PIMS Lounge)