A stochastic Gronwall lemma and well-posedness of path-dependent SDEs driven by martingale noise

Sima Mehri,M. Scheutzow

Published 2019 in Latin American Journal of Probability and Mathematical Statistics

ABSTRACT

We show existence and uniqueness of solutions of stochastic path-dependent differential equations driven by cadlag martingale noise under joint local monotonicity and coercivity assumptions on the coefficients with a bound in terms of the supremum norm. In this set-up, the usual proof using the ordinary Gronwall lemma together with the Burkholder-Davis-Gundy inequality seems impossible. In order to solve this problem, we prove a new and quite general stochastic Gronwall lemma for cadlag martingales using Lenglart's inequality.

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