Metric cotype

Manor Mendel

doi:10.4007/annals.2008.168.247

Metric cotype

2008-07-01

75

OA

AI

DOI：10.4007/annals.2008.168.247

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We introduce the notion of cotype of a metric space, and prove that for Banach spaces it coincides with the classical notion of Rademacher cotype. This yields a concrete version of Ribe's theorem, settling a long standing open problem in the nonlinear theory of Banach spaces. We apply our results to several problems in metric geometry. Namely, we use metric cotype in the study of uniform and coarse embeddings, settling in particular the problem of classifying when LP coarsely or uniformly embeds into L-q. We also prove a nonlinear analog of the Maurey-Pisier theorem, and use it to answer a question posed by Arora, Lovasz, Newman, Rabani, Rabinovich and Vempala, and to obtain quantitative bounds in a metric Ramsey theorem clue to Matousek.

Keyword:

BANACH-SPACES

UNIFORM EMBEDDINGS

SQUARE ROOTS

GEOMETRY

SERIES

Metric cotype

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