Pinsky Lecture Series | Alex Lubotzky (Weizmann Institute, Hebrew University)

Name: Pinsky Lecture Series | Alex Lubotzky (Weizmann Institute, Hebrew University)
Start: 2025-10-30T13:00:00-05:00
End: 2025-10-30T14:00:00-05:00
Location: Swift Hall, 107

Thursday, October 30, 2025 | 1:00 PM - 2:00 PM CT

Swift Hall, 107, 2029 Sheridan Road, Evanston, IL 60208 map it

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Title: Group stability and approximation

Abstract: In this talk, we will show how group stability (the question of whether every "almost" representation is a small deformation of a real one) can be considered a non-commutative version of code testability. We then use it to show a number of non-approximation results by using the high-dimensional expanders and the results of Garland and of Deligne. Based on joint works with Glebsky, Thom, Oppenheim, Bachner, and Dogon.

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Department of Mathematics: Special Events

Pinsky Lecture Series | Alex Lubotzky (Weizmann Institute, Hebrew University)

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