A Trajectorial Interpretation of Doob's Martingale Inequalities

Details A Trajectorial Interpretation of Doob's Martingale Inequalities A Trajectorial Interpretation of Doob's Martingale Inequalities

2012-02-02

arxiv.org/abs/1202.0447v2

Mathematics

Probability

9 pages

Scientific paper

We present a unified approach to Doob's $L^p$ maximal inequalities for $1\leq p<\infty$. The novelty of our method is that these martingale inequalities are obtained as consequences of elementary \emph{deterministic} counterparts. The latter have a natural interpretation in terms of robust hedging. Moreover our deterministic inequalities lead to new versions of Doob's maximal inequalities. These are best possible in the sense that equality is attained by properly chosen martingales.

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