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math.OA2025
Graph morphisms as groupoid actors
Gilles G. de Castro, Ralf Meyer
We describe proper actors from the underlying groupoid of a graph C*-algebra to another étale groupoid in terms of bisections. This allows to understand graph morphisms and the *-h…
math.OA2025
Bicategories of C*-correspondences as Dwyer-Kan localisations
Ralf Meyer
We show that the bicategory of proper correspondences is the Dwyer-Kan localisation of the category of C*-algebras at a certain class of *-homomorphisms.