Small ball probability estimates in terms of width

preprint2005arXivOpen access

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)≤1/2γ_{n}(K) \leq 1/2 there is γn(sK)≤(2s)w2/4γn(K)γ_{n}(sK) \leq (2s)^{w^{2}/4}γ_{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.

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