Vern Paulsen, University of Waterloo: Exactness and Lifting Results via Operator System Methods
Overview
Date:
Starts 5 May 2026, 13:15Ends 5 May 2026, 14:15Location:
MV:L14, Chalmers tvärgata 3Language:
English
Abstract: We use an operator system approach to give new proofs of Wasserman's result that the full C*-algebras of free groups are non-exact and of Rosenberg's result that the reduced group C*-algebras of non-amenable groups are not quasi-diagonal. This approach also gives distance estimates between certain matrix convex sets and their various relaxations. Based on joint work with K. Davidson and M. Rahaman.
Malin Palö Forsström
- Assistant Professor, Analysis and Probability Theory, Mathematical Sciences
