Department of

# Mathematics

Seminar Calendar
for events the day of Wednesday, April 15, 2020.

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Questions regarding events or the calendar should be directed to Tori Corkery.
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Wednesday, April 15, 2020

3:30 pm in https://illinois.zoom.us/j/806582029 (email Anush Tserunyan for password),Wednesday, April 15, 2020

#### An obstruction for classification by actions of TSI Polish groups, part 2: proofs

###### Aristotelis Panagiotopoulos (Caltech Math)

Abstract: In this talk we will over the proof of my recent result (joint with Shaun Allison) that if a $G$-space $X$ is generically unbalanced then its orbit equivalence relation is not classifiable by actions of TSI Polish groups. I will also discuss how one can use this result to show that Morita equivalence between continuous-trace $C^*$ algebras, as well as isomorphism between Hermitian line bundles, are not classifiable by TSI group actions.