On co-amenability for groups and von Neumann algebras

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We first show that co-amenability does not pass to subgroups, answering a question asked by Eymard in 1972. We then address co-amenability for von Neumann algebras, describing notably how it relates to the former.
final version (minor changes)

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Group Theory, Operator Algebras, 43A07; 43A85; 46L

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http://salesiana.dossiersoluciones.com/handle/123456789/98443

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0301348
 http://arxiv.org/abs/math/0301348
 Final version is in: C. R. Acad. Sci. Canada 25 No. 3 (2003) 82--87.

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