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arXiv 1208.2200math.PR
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巴拿赫空间中鞅分布的最佳界

Optimum bounds for the distributions of martingales in Banach spaces

Iosif Pinelis

摘要:

在2-光滑巴拿赫空间中,提出了一种将独立实值随机变量和的指数不等式推广到鞅的一般方法.利用这一方法,得到了2-光滑巴拿赫空间中鞅矩的Rosenthal-Burkholder型和Chung型的最优界.反过来,它导致最佳顺序的任何可分的巴拿赫空间中的独立随机向量的和的时刻的界。虽然重点放在无穷维鞅上,但大多数结果似乎是新的,即使是一维的。此外,Rosenthal-Burkholder型矩的界似乎在一定程度上是新的,甚至对于独立实值随机变量的和也是如此。给出了(一维)上鞅的类似不等式。

英文摘要:

A general device is proposed, which provides for extension of exponential inequalities for sums of independent real-valued random variables to those for martingales in the 2-smooth Banach spaces. This is used to obtain optimum bounds of the Rosenthal-Burkholder and Chung types on moments of the martingales in the 2-smooth Banach spaces. In turn, it leads to best-order bounds on moments of the sums of independent random vectors in any separable Banach spaces. Although the emphasis is put on the infinite-dimensional martingales, most of the results seem to be new even for the one-dimensional ones. Moreover, the bounds on the Rosenthal-Burkholder type of moments seem to be to certain extent new even for the sums of independent real-valued random variables. Analogous inequalities for (one-dimensional) supermartingales are given.

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