Moyennabilite interieure et extensions HNN

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We present sufficient conditions for HNN extensions to be inner amenable, respectively ICC, which give necessary and sufficient criteria among Baumslag-Solitar groups. We deduce that such a group, viewed as acting on its Bass-Serre tree, contains non trivial elements which fix unbounded subtrees.
16 pages, in french. Slightly stronger results and typographic corrections. To appear in Ann. Inst. Fourier (Grenoble)

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Group Theory, 20E06; 20E08; 20E45

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http://salesiana.dossiersoluciones.com/handle/123456789/94753

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0505657
 http://arxiv.org/abs/math/0505657

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arXiv