Nir Avni : Products of conjugacy classes.

Posted by Dhruv Mubayi , part of the Departmental Colloquium.

At

Nov. 14, 2025, 3 p.m.

In

636 SEO

Abstract

I will talk about two new rigidity phenomena for arithmetic groups. The first, model theoretic, is about axiomatizing such a group using first order logic. The second is about conjugation-invariant norms on the group. Both rigidity results rely on studying the set-theoretic products of conjugacy classes. Based on joint works with Alex Lubotzky and Chen Meiri.