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arXiv 0911.4444math.PRmath.OC
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上鞅的一个极大不等式

A Maximal Inequality for Supermartingales

Bruce Hajek

摘要:

给出了上鞅最大值分布的一个紧上界。具体地说,证明了如果$Y$是初值为零的半鞅,且二次变差过程$[Y,Y]$使得$Y + [Y,Y]$是上鞅,则$Y$的最大值大于或等于正常数$a$的概率小于或等于$1/(1+a).$.

英文摘要:

A tight upper bound is given on the distribution of the maximum of a supermartingale. Specifically, it is shown that if $Y$ is a semimartingale with initial value zero and quadratic variation process $[Y,Y]$ such that $Y + [Y,Y]$ is a supermartingale, then the probability the maximum of $Y$ is greater than or equal to a positive constant $a$ is less than or equal to $1/(1+a).$ The proof makes use of the semimartingale calculus and is inspired by dynamic programming.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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