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Finite-dimensional approximation properties for uniform Roe algebras

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arxiv 1212.5900 v4 pith:6YF4WU4H submitted 2012-12-24 math.OA math.GRmath.MG

classification math.OAmath.GRmath.MG
keywords propertyalgebrasapproximationboundedfinite-dimensionalgeometrymetricproperties
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abstract

We study property A for metric spaces $X$ with bounded geometry introduced by Guoliang Yu. Property A is an amenability-type condition, which is less restrictive than amenability for groups. The property has a connection with finite-dimensional approximation properties in the theory of operator algebras. It has been already known that property A of a metric space $X$ with bounded geometry is equivalent to nuclearity of the uniform Roe algebra C$^*_u(X)$. We prove that exactness and local reflexivity of C$^*_u(X)$ also characterize property A of $X$.

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  1. Quasi-local Algebras and Asymptotic Expanders

    math.OA 2019-08 accept novelty 8.0 of 10

    The paper defines asymptotic expanders, characterizes quasi-locality of averaging projections via them, and proves the uniform quasi-local algebra is nuclear iff the space has Property A.

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