Department of

Mathematics

Seminar Calendar
for events the day of Wednesday, May 6, 2020.

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Wednesday, May 6, 2020

3:30 pm in https://illinois.zoom.us/j/806582029 (email Anush Tserunyan for password),Wednesday, May 6, 2020

Introduction to 𝓁2-Betti numbers for groups, part 2: Group homology

Ruiyuan (Ronnie) Chen (UIUC Math)

Abstract: We will discuss equivariant homology for spaces equipped with a group action, defined as the ordinary homology of the "homotopy quotient" of the action. Group homology is the special case for the trivial action on a point. Time permitting, we will then begin to discuss the theory of (Hattori-Stallings) traces, which provides a better-behaved equivariant analog of torsion-free rank.