The Group Property of the Invariant S of von Neumann Algebras.
A. van Daele, A. Connes (1973)
Mathematica Scandinavica
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A. van Daele, A. Connes (1973)
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Erling Stormer (1972)
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William L. Geen (1975)
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Kenneth Keller Hickin (1981)
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Erik Bédos (1991)
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Takehiko Yamanouchi (1992)
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Yasuyuki Kawahigashi (1989)
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Herbert Halpern (1978)
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Uffe Haagerup (1975)
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Stefaan Vaes (2005-2006)
Séminaire Bourbaki
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Using very original methods from operator algebras, Sorin Popa has shown that the orbit structure of the Bernoulli action of a property (T) group, completely remembers the group and the action. This information is even essentially contained in the crossed product von Neumann algebra. This is the first von Neumann strong rigidity theorem in the literature. The same methods allow Popa to obtain II factors with prescribed countable fundamental group.
George A. Elliot (1976)
Mathematica Scandinavica
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Jorund Gasemyr (1990)
Mathematica Scandinavica
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Troels Jorgensen, Alan F. Beardon (1975)
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