I will discuss a question raised independently by Greenberg and Shalom: Can an infinite discrete subgroup of a simple Lie group have dense commensurator and not be a lattice? I will explain the surprising connections between this question and other long-standing open problems, and discuss recent progress on special cases of the question. This is joint work with (subsets of) Brody, Fisher, and Mj.
De Tim de Laat
De Alp Uzman
De Bassam Fayad
De Amanda Wilkens
De Cyril Houdayer
De Federico Rodriguez Hertz
De Charles Frances
De Mason Hart
De Leon Carvajales
De Sara Maloni
De Sara Maloni
De Sara Maloni
