J ul 2 00 9 NON - HAUSDORFF SYMMETRIES OF C ∗ - ALGEBRAS
نویسنده
چکیده
Symmetry groups or groupoids of C∗-algebras associated to nonHausdorff spaces are often non-Hausdorff as well. We describe such symmetries using crossed modules of groupoids. We define actions of crossed modules on C∗-algebras and crossed products for such actions, and justify these definitions with some basic general results and examples.
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