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Let $Gamma$ be a discrete group satisfying the approximation property (AP). Let $X$, $Y$ be $Gamma$-spaces and $pi colon Y to X$ be a proper factor map which is injective on the non-free part. We prove the one-to-one correspondence between intermediate ${rm C}^ast$-algebras of $C_0(X) rtimes_r Gamma subset C_0(Y) rtimes Gamma$ and intermediate $Gamma$-${rm C}^ast$-algebras of $C_0(X) subset C_0(Y)$. This is a generalization of Suzukis theorem that proves the statement for free actions.
This paper introduces the notion of Rota-Baxter $C^{ast}$-algebras. Here a Rota-Baxter $C^{ast}$-algebra is a $C^{ast}$-algebra with a Rota-Baxter operator. Symmetric Rota-Baxter operators, as special cases of Rota-Baxter operators on $C^{ast}$-algeb
The program of matrix product states on the infinite tensor product ${mathcal A}^{otimes mathbb Z}$, initiated by Fannes, Nachtergaele and Werner in their seminal paper Commun. Math. Phys. Vol. 144, 443-490 (1992), is re-assessed in a context where $
We give some sufficient conditions for the injectivity of actions of compact quantum groups on $C^{ast}$-algebra. As an application, we prove that any faithful smooth action by a compact quantum group on a compact smooth (not necessarily connected) m
We construct a functor that maps $C^*$-correspondences to their Cuntz-Pimsner algebras. The objects in our domain category are $C^*$-correspondences, and the morphisms are the isomorphism classes of $C^*$-correspondences satisfying certain conditions
The spectral functor of an ergodic action of a compact quantum group G on a unital C*-algebra is quasitensor, in the sense that the tensor product of two spectral subspaces is isometrically contained in the spectral subspace of the tensor product rep