Classifying spaces and Bredon (co)homology for transitive groupoids

Farsi, Carla; Scull, Laura; Watts, Jordan

doi:10.1090/proc/14930

Classifying spaces and Bredon (co)homology for transitive groupoids
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by Carla Farsi, Laura Scull and Jordan Watts PDF

Proc. Amer. Math. Soc. 148 (2020), 2717-2737 Request permission

Abstract:

We define the orbit category for transitive topological groupoids and their equivariant CW-complexes. By using these constructions we define equivariant Bredon homology and cohomology for actions of transitive topological groupoids. We show how these theories can be obtained by looking at the action of a single isotropy group on a fiber of the anchor map, extending equivariant results for compact group actions. We also show how this extension from a single isotropy group to the entire groupoid action can be applied to the structure of principal bundles and classifying spaces.

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