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Small ball probability estimates in terms of width

Probability 2014-09-19 v1 Functional Analysis

Abstract

A certain inequality conjectured by Vershynin is studied. It is proved that for any nn-dimensional symmetric convex body KK with inradius ww and γn(K)1/2\gamma_{n}(K) \leq 1/2 there is γn(sK)(2s)w2/4γn(K)\gamma_{n}(sK) \leq (2s)^{w^{2}/4}\gamma_{n}(K) for any s[0,1]s \in [0,1]. Some natural corollaries are deduced. Another conjecture of Vershynin is proved to be false.

Keywords

Cite

@article{arxiv.math/0501268,
  title  = {Small ball probability estimates in terms of width},
  author = {Rafał Latała and Krzysztof Oleszkiewicz},
  journal= {arXiv preprint arXiv:math/0501268},
  year   = {2014}
}

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10 pages