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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 redu…
math.OA2024
The Zappa-Szép product of twisted groupoids
Anna Duwenig, Boyu Li
We define and study the external and the internal Zappa-Szép product of twists over groupoids. We determine when a pair of twists over a matched pair $(\mathcal{G}_…
math.OA2024★ 1 cited
Non-traditional Cartan subalgebras in twisted groupoid C*-algebras
Anna Duwenig, Dana P. Williams, Joel Zimmerman
Well-known work of Renault shows that if is a twist over a second countable, effective, étale groupoid , then there is a naturally associated Cartan subalgebra of…