A new metric invariant for Banach spaces

Details A new metric invariant for Banach spaces A new metric invariant for Banach spaces

2009-12-30

arxiv.org/abs/0912.5113v1

Mathematics

Functional Analysis

22 pages

Scientific paper

We show that if the Szlenk index of a Banach space $X$ is larger than the first infinite ordinal $\omega$ or if the Szlenk index of its dual is larger than $\omega$, then the tree of all finite sequences of integers equipped with the hyperbolic distance metrically embeds into $X$. We show that the converse is true when $X$ is assumed to be reflexive. As an application, we exhibit new classes of Banach spaces that are stable under coarse-Lipschitz embeddings and therefore under uniform homeomorphisms.

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