Departmental Colloquium
Nir Avni
Northwestern University
Products of conjugacy classes.
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.
Friday November 14, 2025 at 3:00 PM in 636 SEO