3 papers
math.OA2026
Morita equivalence of graded C*-algebras
John Quigg, Efren Ruiz, Aidan Sims
We define two notions of Morita equivalence for graded C*-algebras (graded Morita equivalence and homogeneous Morita equivalence) and provide Brown-Green-Rieffel Stabilization Type…
math.OA2025
Lifting isomorphisms in -theory through gradings of -algebras
Efren Ruiz, Aidan Sims
We show that every strongly -graded C*-algebra (equivalently, every C*-algebra carrying a strongly continuous -action with full spectral subspaces) is a Cun…
math.OA2024
Norm upper-semicontinuity of functions supported on open abelian isotropy in étale groupoids (a corrigendum to "Reconstruction of groupoids and C*-rigidity of dynamical systems," Adv. Math 390 (2021), 107923)
Toke Meier Carlsen, Anna Duwenig, Efren Ruiz +1
We consider étale Hausdorff groupoids in which the interior of the isotropy is abelian. We prove that the norms of the images under regular representations, of elements of the red…