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Consider the countably infinite reduced free product D of copies of ( C([0,1]),λ), where $λ$ is Lebesgue measure. It is proved that finite and countable reduced free products of unital separable nuclear UCT 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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Elliott et al. (2026) studied this question.
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