A relative double commutant theorem for hereditary sub-C*-algebras

Abstract

We prove a double commutant theorem for hereditary subalgebras of a large class of C*-algebras, partially resolving a problem posed by Pedersen[8]. Double commutant theorems originated with von Neumann, whose seminal result evolved into an entire field now called von Neumann algebra theory. Voiculescu proved a C*-algebraic double commutant theorem for separable subalgebras of the Calkin algebra. We prove a similar result for hereditary subalgebras which holds for arbitrary corona C*-algebras. (It is not clear how generally Voiculescu's double commutant theorem holds.)

Nous démontrons un théorème commutant double (d'après Voiculescu et von Neumann) pour des sous-C*-algèbres héréditaires dans une C*-algèbre &&corona&&, c'est a dire M(A)/A.