Intermediate crossed product $C^{\ast }$-algebras

Tattwamasi Amrutam, Ilan Hirshberg, Apurva Seth

Let $B$ be a separable $C^{\ast }$-algebra, let $\Gamma$ be a discrete countable group, let $\alpha :\Gamma \to \text{Aut}(B)$ be an action, and let $A$ be an invariant subalgebra. We find certain freen…