Exactness and SOAP of Crossed Products via Herz--Schur multipliers

Andrew McKee, Lyudmila Turowska

Given a $C^{\ast }$-dynamical system $(A,G,\alpha )$, with $G$ a discrete group, Schur $A$-multipliers and Herz--Schur $(A,G,\alpha )$-multipliers are used to implement approximation properties, nam…