3 papers
math.OA2026
A universal coefficient theorem for actions of finite cyclic groups of square-free order on C*-algebras
Ralf Meyer, George Nadareishvili
We prove a Universal Coefficient Theorem for objects in the bootstrap class in the equivariant Kasparov category for a finite cyclic group of square-free order.
math.RA2026
A bicategorical perspective on Steinberg algebras
Ralf Meyer, Fabian Rodatz, Taufik Yusof
We show that the Steinberg algebra construction for ample groupoids is part of a pseudofunctor from the bicategory of ample groupoids and groupoid correspondences to the bicategory…
math.OA2026
A universal property for groupoid C*-algebras. II. Fell bundles
Alcides Buss, Rohit Holkar, Ralf Meyer
We define possibly unsaturated, upper semicontinuous Fell bundles over Hausdorff, locally compact groupoids and establish a universal property for representations of their full sec…