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

Thursday, October 30, 2025 | 1:00 PM - 2:00 PM CT
Swift Hall, 107, 2029 Sheridan Road, Evanston, IL 60208 map it

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. 

 

 

Audience

  • Faculty/Staff
  • Student
  • Post Docs/Docs
  • Graduate Students

Contact

Antonio Auffinger   (847) 491-5524

tuca@northwestern.edu

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