2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/66858In this paper we consider two elliptic problems. The first one is a Dirichlet problem while the second is Neumann. We extend all the known results concerning Landesman-Laser conditions by using the Mountain-Pass theorem with the Cerami $(PS)$ condition.Analysis of PDEs35J25text