A general Doob-Meyer-Mertens decomposition for g-supermartingale systems

Bruno Bouchard, Dylan Possamaï, Xiaolu Tan
2016 Electronic Journal of Probability  
We provide a general Doob-Meyer decomposition for g-supermartingale systems, which does not require any right-continuity on the system, nor that the filtration is quasi left-continuous. In particular, it generalizes the Doob-Meyer decomposition of Mertens [35] for classical supermartingales, as well as Peng's [40] version for right-continuous g-supermartingales. As examples of application, we prove an optional decomposition theorem for g-supermartingale systems, and also obtain a general
more » ... of the wellknown dual formation for BSDEs with constraint on the gains-process, using very simple arguments.
doi:10.1214/16-ejp4527 fatcat:l64vcie5abaf5c2krfz3wzcc2y