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• W2761648792 abstract "A C*-dynamical system is said to have the ideal separation property if every ideal in the corresponding crossed product arises from an invariant ideal in the C*-algebra. In this paper we characterize this property for unital C*-dynamical systems over discrete groups. To every C*-dynamical system we associate a twisted partial C*-dynamical system that encodes much of the structure of the action. This system can often be untwisted, for example when the algebra is commutative, or when the algebra is prime and a certain specific subgroup has vanishing Mackey obstruction. In this case, we obtain relatively simple necessary and sufficient conditions for the ideal separation property. A key idea is a notion of noncommutative boundary for a C*-dynamical system that generalizes Furstenberg's notion of topological boundary for a group." @default.
• W2761648792 created "2017-10-20" @default.
• W2761648792 creator A5025838547 @default.
• W2761648792 creator A5070210953 @default.
• W2761648792 date "2019-11-15" @default.
• W2761648792 modified "2023-10-14" @default.
• W2761648792 title "Noncommutative boundaries and the ideal structure of reduced crossed products" @default.
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• W2761648792 doi "https://doi.org/10.1215/00127094-2019-0032" @default.
• W2761648792 hasPublicationYear "2019" @default.
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