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Cohomology for the ergodic actions of countable groups
Certain aspects of Mackeyā€™s theory of virtual groups were fitted into a cohomology theory for ergodic groupoids in a previous paper by the author. Here we relate the groupoid cohomology for ergodic groupoids that arise (by Mackeyā€™s construction) from ergodic actions of countable groups to the usual group cohomology. In ā€¦