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Biexact von Neumann algebras

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arxiv 2309.10161 v1 pith:LBTVK6DT submitted 2023-09-18 math.OA

classification math.OA
keywords algebrasneumannbiexactcertainexamplesgivesolidbiexactness
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abstract

We introduce the notion of biexactness for general von Neumann algebras, naturally extending the notion from group theory. We show that biexactness implies solidity for von Neumann algebras, and that many of the examples of solid von Neumann algebras contained in the literature are, in fact, biexact. We also give examples of certain crossed products arising from Gaussian actions that are solid but not biexact, and we give examples of certain $q$-Gaussian von Neumann algebras that are strongly solid but not biexact. The techniques developed involve studying a certain weak form of nuclear embeddings, and we use this setting to give a new description of weak exactness for von Neumann algebras, which allows us to answer several open problems in the literature about weakly exact von Neumann algebras.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. W*-correlations of II$_1$ factors and rigidity of tensor products and graph products

    math.OA 2025-07 conditional novelty 7.0 of 10

    Different subsets F of {2,3,...} give groups G_F whose von Neumann algebras are not W*-correlated, hence not measure equivalent nor W*-equivalent.

  2. On Relative Biexactness of Amalgamated Free Product von Neumann Algebras

    math.OA 2025-05 conditional novelty 7.0 of 10

    Amalgamated free products of weakly exact tracial von Neumann algebras over injective amalgams are relatively biexact, and injective free products over a mixing amalgam are biexact.

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