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A composite generalization of Ville's martingale theorem [PDF]

open access: greenCoRR, 2022
We provide a composite version of Ville's theorem that an event has zero measure if and only if there exists a nonnegative martingale which explodes to infinity when that event occurs. This is a classic result connecting measure-theoretic probability to the sequence-by-sequence game-theoretic probability, recently developed by Shafer and Vovk.
Johannes Ruf   +3 more
openalex   +3 more sources

A generalization of Cramér large deviations for martingales [PDF]

open access: greenComptes Rendus. Mathématique, 2014
In this note, we give a generalization of Cramér's large deviations for martingales, which can be regarded as a supplement of Fan et al. (2013) [3]. Our method is based on the change of probability measure developed by Grama and Haeusler (2000) [6].
Xiequan Fan, Ion Grama, Quansheng Liu
openalex   +5 more sources

Generalization of Itô's formula for smooth nondegenerate martingales

open access: closedStochastic Processes and their Applications, 2001
Let \(W\) be a \(d\)-dimensional Wiener process, \(X=(X_ {t}) _ {0\leq t\leq T}\) a \(d\)-dimensional continuous local martingale adapted to \(W\) and satisfying certain nondegeneracy hypotheses. It is proven that if \(f\in L^ {p}_ {\text{loc}}(\mathbb R^ {d})\) for some \(p>d\), then the quadratic covariation of the processes \(f(X)\) and \(X^ {i}\), \
S. Moret, David Nualart
openalex   +3 more sources

Generalized kolmogorov inequalities for martingales [PDF]

open access: yesZeitschrift f�r Wahrscheinlichkeitstheorie und Verwandte Gebiete, 1976
The classical cebysev inequality leads to an inequality for martingales which is often called the Kolmogorov inequality. It is shown here that many generalized cebysev inequalities for random variables lead in a similar way to martingale inequalities, and that the corresponding martingale inequality is sharp when the cebysev inequality is.
Gilat, D., Sudderth, W. D.
openaire   +2 more sources

Exponential inequalities for martingales with applications [PDF]

open access: yes, 2015
The paper is devoted to establishing some general exponential inequalities for supermartingales. The inequalities improve or generalize many exponential inequalities of Bennett, Freedman, de la Pe\~{n}a, Pinelis and van de Geer.
Fan, Xiequan, Grama, Ion, Liu, Quansheng
core   +4 more sources

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