Classifying the Type of Principal Groupoid C*-algebras

Details Classifying the Type of Principal Groupoid C*-algebras Classifying the Type of Principal Groupoid C*-algebras

2005-11-17

arxiv.org/abs/math/0511450v1

Mathematics

Operator Algebras

Scientific paper

Suppose $G$ is a second countable, locally compact, Hausdorff groupoid with a fixed left Haar system. Let $\go/G$ denote the orbit space of $G$ and $\cs(G)$ denote the groupoid $C^*$-algebra. Suppose that $G$ is a principal groupoid. We show that $C^*(G)$ is CCR if and only if $\go/G$ is a $T_1$ topological space, and that $C^*(G)$ is GCR if and only if $\go/G$ is a $T_0$ topological space. We also show that $C^*(G)$ is a Fell Algebra if and only if $G$ is a Cartan groupoid.

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