Large Deviations of Vector-valued Martingales in 2-Smooth Normed Spaces

Details Large Deviations of Vector-valued Martingales in 2-Smooth Normed Spaces Large Deviations of Vector-valued Martingales in 2-Smooth Normed Spaces

2008-09-04

arxiv.org/abs/0809.0813v1

Mathematics

Probability

Scientific paper

We derive exponential bounds on probabilities of large deviations for "light tail" martingales taking values in finite-dimensional normed spaces. Our primary emphasis is on the case where the bounds are dimension-independent or nearly so. We demonstrate that this is the case when the norm on the space can be approximated, within an absolute constant factor, by a norm which is differentiable on the unit sphere with a Lipschitz continuous gradient. We also present various examples of spaces possessing the latter property.

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