October 5, 2017

Perturbations of Operators and Commutants Mod Normed Ideals

Normed ideals of compact operators are the infinitesimals of Alain Connes’ noncommutative geometry. In the study of operators modulo perturbations from these ideals a numerical invariant plays often a key role. Recently more structure is appearing in these questions from the commutant modulo the normed ideal. Connections with dynamical entropy, K-theory of operator algebras, supramenable groups and Banach space duality aspects will also be discussed. Tea at 3:33 pm in Stevenson 1425. (Contact Person: Dietmar Bisch)