Z\mathcal Z-stability of C(X)⋊Γ\mathrm{C}(X)\rtimesΓ

preprint2020arXivOpen access

Abstract

Let (X,Γ)(X, Γ) be a free and minimal topological dynamical system, where XX is a separable compact Hausdorff space and ΓΓ is a countable infinite discrete amenable group. It is shown that if (X,Γ)(X, Γ) has the Uniform Rokhlin Property and Cuntz comparison of open sets, then mdim(X,Γ)=0\mathrm{mdim}(X, Γ)=0 implies that (C(X)⋊Γ)⊗Z≅C(X)⋊Γ(\mathrm{C}(X) \rtimesΓ)\otimes\mathcal Z \cong \mathrm{C}(X) \rtimesΓ, where mdim\mathrm{mdim} is the mean dimension and Z\mathcal Z is the Jiang-Su algebra. In particular, in this case, mdim(X,Γ)=0\mathrm{mdim}(X, Γ)=0 implies that the C*-algebra C(X)⋊Γ\mathrm{C}(X) \rtimesΓ is classified by the Elliott invariant.

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