Mathematics – Group Theory
Scientific paper
2010-08-24
Mathematics
Group Theory
Updated to include a discussion of functoriality
Scientific paper
Generalizing Block and Weinberger's characterization of amenability we introduce the notion of uniformly finite homology for a group action on a compact space and use it to give a homological characterization of topological amenability for actions. By considering the case of the natural action of $G$ on its Stone-\vCech compactification we obtain a homological characterization of exactness of the group, answering a question of Nigel Higson.
Brodzki Jacek
Niblo Graham A.
Nowak Piotr
Wright Nick J.
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