Fundamental group of simple C∗C^*-algebras with unique trace II

preprint2010arXivOpen access

Abstract

We show that any countable subgroup of the multiplicative group R+×\mathbb{R}_+^{\times} of positive real numbers can be realized as the fundamental group F(A)\mathcal{F}(A) of a separable simple unital C∗C^*-algebra AA with unique trace. Furthermore for any fixed countable subgroup GG of R+×\mathbb{R}_+^{\times}, there exist uncountably many mutually nonisomorphic such algebras AA with G=F(A)G = \mathcal{F}(A).

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