Classification of reduced free products of nuclear C*-algebras

Consider the countably infinite reduced free product $D$ of copies of $(\mathrm C([0,1]),λ)$, where $λ$ is Lebesgue measure. It is proved that finite and countable reduced free products of unital separable nuclear UCT $\mathrm C^*$-algebras with respect to a chosen family of faithful traces are classified, after adjoining $D$, by the Elliott invariant. In other words, an isomorphism between the naive K-theory invariants of two such algebras is induced by an isomorphism between the algebras.

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Publication Details

Journal
arXiv (Cornell University)
Published
2026-10-27
DOI
https://doi.org/10.48550/arxiv.2610.36459
Primary Topic
Advanced Operator Algebra Research
Type
preprint
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preprint

Classification of reduced free products of nuclear C*-algebras

George A. Elliott, Chun Guang Li, Zhuang Niu
arXiv (Cornell University)
Advanced Operator Algebra Research
preprint

Classification of reduced free products of nuclear C*-algebras

George A. Elliott, Chun Guang Li, Zhuang Niu
preprint en

Abstract

Consider the countably infinite reduced free product $D$ of copies of $(\mathrm C([0,1]),λ)$, where $λ$ is Lebesgue measure. It is proved that finite and countable reduced free products of unital separable nuclear UCT $\mathrm C^*$-algebras with respect to a chosen family of faithful traces are classified, after adjoining $D$, by the Elliott invariant. In other words, an isomorphism between the naive K-theory invariants of two such algebras is induced by an isomorphism between the algebras.

arXiv (Cornell University)
Advanced Operator Algebra Research
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Classification of reduced free products of nuclear C*-algebras — George A. Elliott, Chun Guang Li, et al. · arXiv (Cornell University) (2026) | TGRS Research Map | TGRS