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Compression functions of uniform embeddings of groups into Hilbert and Banach spaces

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Druţu, Cornelia
Sapir, Mark
Submitted to Journal für die Reine und Angewandte Mathematik. 2008
Abstract We construct finitely generated groups with arbitrary prescribed Hilbert space compression alpha from the interval [0,1]. For a large class of Banach spaces E (including all uniformly convex Banach spaces), the E-compression of these groups coincides with their Hilbert space compression. Moreover, the groups that we construct have asymptotic dimension at most 3, hence they are exact. In particular, the first examples of groups that are uniformly embeddable into a Hilbert space (respectively, exact, of finite asymptotic dimension) with Hilbert space compression 0 are given. These groups are also the first examples of groups with uniformly convex Banach space compression 0.
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ARZHANTSEVA, Goulnara N., DRUŢU, Cornelia, SAPIR, Mark. Compression functions of uniform embeddings of groups into Hilbert and Banach spaces. Submitted to: Journal für die Reine und Angewandte Mathematik, 2008. https://archive-ouverte.unige.ch/unige:9746

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Deposited on : 2010-07-27

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