Department of Mathematics

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)