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• W1543905780 abstract "Given positive integers n and m, we consider dynamical systems in which n copies of a topological space is homeomorphic to m copies of that same space. The universal such system is shown to arise naturally from the study of a C*-algebra we denote by O_{mn}, which in turn is obtained as a quotient of the well known Leavitt C*-algebra L_{mn}, a process meant to transform the generating set of partial isometries of L{mn} into a tame set. Describing O_{mn} as the crossed-product of the universal (m,n)-dynamical system by a partial action of the free group F_{m+n}, we show that O_{mn} is not exact when n and m are both greater than or equal to 2, but the corresponding reduced crossed-product, denoted O_{mn}^r, is shown to be exact and non-nuclear. Still under the assumption that m,n>=2, we prove that the partial action of F_{m+n} is topologically free and that O_{mn}^r satisfies property (SP) (small projections). We also show that O_{mn}^r admits no finite dimensional representations. The techniques developed to treat this system include several new results pertaining to the theory of Fell bundles over discrete groups." @default.
• W1543905780 created "2016-06-24" @default.
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• W1543905780 date "2011-09-19" @default.
• W1543905780 modified "2023-09-27" @default.
• W1543905780 title "Dynamical systems of type (m,n) and their C*-algebras" @default.
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