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Jolissaint, Paul
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Jolissaint, Paul
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paul.jolissaint@unine.ch
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Haagerup approximation property for finite von Neumann algebras
2002, Jolissaint, Paul
We study finite von Neumann algebras M that admit an approximate identity made with completely positive normal maps whose extention to L-2(M) are compact operators. We prove heredity results, and we state sufficient conditions on actions of countable groups to ensure that the crossed product algebras have the same property.