Classification of inductive limits of 1-dimensional NCCW complexes

Details Classification of inductive limits of 1-dimensional NCCW complexes Classification of inductive limits of 1-dimensional NCCW complexes

2010-07-12

arxiv.org/abs/1007.1964v2

Mathematics

Operator Algebras

Added a subsection with a universal characterization of the Jiang-Su algebra and remarking on its embeddability into the reduc

Scientific paper

A classification result is obtained for the C*-algebras that are (stably isomorphic to) inductive limits of 1-dimensional noncommutative CW complexes with trivial $K_1$-group. The classifying functor Cu is defined in terms of the Cuntz semigroup of the unitization of the algebra. For the simple C*-algebras covered by the classification, Cu reduces to the ordered $K_0$-group, the cone of traces, and the pairing between them. As an application of the classification, it is shown that the crossed products by a quasi-free action $O_2\rtimes_\lambda \mathbb{R}$ are all isomorphic for a dense set of positive irrational numbers $\lambda$.

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