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A remark on amenable von Neumann subalgebras in a tracial free product
Published 26 Jan 2015 in math.OA | (1501.06373v2)
Abstract: Let $M=M_1*M_2$ be a nontrivial tracial free product of finite von Neumann algebras. We prove that any amenable subalgebra of $M$ that has a diffuse intersection with $M_1$ is in fact contained in $M_1$. This has been proved by C. Houdayer under more general circumstances.
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