Mathematics – Operator Algebras
Scientific paper
2011-11-18
Mathematics
Operator Algebras
arXiv admin note: substantial text overlap with arXiv:math/0508342
Scientific paper
Let (G, X) be a transformation group where the group $G$ does not necessarily act freely on the space X. We investigate the extent to which the action of G may fail to be proper. Stability subgroups are used to define new notions of strength of convergence in the orbit space and of measure accumulation along orbits. By using the representation theory of the associated crossed product C^*-algebra, we show that these notions are equivalent under certain conditions.
Archbold Robert
Huef Astrid an
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