2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/169258We prove the existence and uniqueness of the solution of a semilinear PDE's and also PDE's with obstacle under monotonicity condition. Moreover we give the probabilistic interpretation of the Sobolev's solutions in term of Backward SDE and reflected Backward SDE respectively.26 pagesProbability35D05, 60H10, 60H30Btext