5 papers
Dynamical comparison for local homeomorphisms
Shirly Geffen, Shanshan Hua, Julian Kranz
We prove dynamical comparison for Deaconu--Renault groupoids associated to minimal surjective non-injective local homeomorphisms of compact metrizable spaces with finite Lebesgue c…
Stable rank one in nonnuclear crossed products
Jamie Bell, Shirly Geffen, David Kerr
We initiate an investigation into the local structure of simple nonnuclear C-crossed products by showing that stable rank one is generic within two natural classes of minimal a…
Simplicity of crossed products by FC-hypercentral groups
Shirly Geffen, Dan Ursu
In this paper, we give a complete, two-way characterization, of when a noncommutative crossed product is simple, in the case of being an FC-hypercentral group.…
Note on C*-algebras associated to boundary actions of hyperbolic 3-manifold groups
Shirly Geffen, Julian Kranz
Using Kirchberg-Phillips' classification of purely infinite C*-algebras by K-theory, we prove that the isomorphism types of crossed product C*-algebras associated to certain hyperb…
Essential freeness, allostery and -stability of crossed products
Eusebio Gardella, Shirly Geffen, Rafaela Gesing +2
We explore classifiability of crossed products of actions of countable amenable groups on compact, metrizable spaces. It is completely understood when such crossed products are sim…