7 citations · 17 across the 12 of their papers we have counts for
12 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…
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…
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. T…
Tracially amenable actions and purely infinite crossed products
Eusebio Gardella, Shirly Geffen, Julian Kranz +2
We introduce the notion of tracial amenability for actions of discrete groups on unital, tracial C-algebras, as a weakening of amenability where all the relevant approximations…
Dynamical comparison and -stability for crossed products of simple -algebras
Eusebio Gardella, Shirly Geffen, Petr Naryshkin +1
We establish -stability for crossed products of outer actions of amenable groups on -stable -algebras under a mild technical assumption which we call…
Classifiability of crossed products by nonamenable groups
Eusebio Gardella, Shirly Geffen, Julian Kranz +1
We show that all amenable, minimal actions of a large class of nonamenable countable groups on compact metric spaces have dynamical comparison. This class includes all nonamenable…
Partial C*-dynamics and Rokhlin dimension
Fernando Abadie, Eusebio Gardella, Shirly Geffen
We develop the notion of Rokhlin dimension for partial actions of finite groups, extending the well-established theory for global systems. The partial setting exhibits phenomena th…
Decomposable partial actions
Fernando Abadie, Eusebio Gardella, Shirly Geffen
We define the decomposition property for partial actions of discrete groups on -algebras. Decomposable partial systems appear naturally in practice, and many commonly occurrin…
Nuclear dimension of crossed products associated to partial dynamical systems
Shirly Geffen
We bound the nuclear dimension of crossed products associated to some partial actions of finite groups or on finite dimensional locally compact Hausdorff second counta…
Classification of irreversible and reversible Pimsner operator algebras
Adam Dor-On, Søren Eilers, Shirly Geffen
Since their inception in the 30's by von Neumann, operator algebras have been used in shedding light in many mathematical theories. Classification results for self-adjoint and non-…