An inner amenable group whose von Neumann algebra does not have property Gamma
classification
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math.GR
keywords
amenablegammainnerneumannpropertyalgebraassociatedclasses
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We construct inner amenable groups G with infinite conjugacy classes and such that the associated II_1 factor does not have property Gamma of Murray and von Neumann. This solves a problem posed by Effros in 1975.
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