Zoom link: https://princeton.zoom.us/j/96282936122

Passcode: 998749

We consider the Euler characteristics of closed orientable 2n-manifolds with a given fundamental group G, and highly-connected universal cover. We  strengthen the 4-dimensional Hausmann-Weinberger estimates and extend to higher dimensions.  As an application we obtain new restrictions for non--abelian finite groups arising as fundamental groups of rational homology 4--spheres.

This is joint work with Alejandro Adem.