黑料不打烊

Event

Su Gao (Nankai University)

Thursday, September 26, 2024 14:30to15:30
Burnside Hall Room 920, 805 rue Sherbrooke Ouest, Montreal, QC, H3A 0B9, CA

Title:聽Extremely amenable automorphism groups of countable structures.

Abstract:聽Extreme amenability is a remarkable property for a topological group to have. Ever since the first example of such groups was constructed in 1975, many groups have been shown to be extremely amenable. In this talk I will address the question: How many pairwise non-isomorphic extremely amenable groups are there? We demonstrate that there are continuum many pairwise non-isomorphic extremely amenable groups which are automorphism groups of countable structures, and in particular Polish. I will also talk about some related results from the point of view of descriptive set theory. This is joint work with Mahmood Etedadialiabadi and Feng Li.

A coffee break will be served before the colloquium at 2pm in the graduate lounge at 黑料不打烊

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