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arxiv: 0911.0238 · v2 · submitted 2009-11-02 · 🧮 math.OA · math.FA

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

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

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