BOUAFIA, AmiraSupervaisor:MOKHTARI, Abdelhak2022-07-252022-07-252022-06-10http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/30960In this work our goal is to study the existence of a solution of a singular kirchhoff type problem with the Dirichlet boundary condition, and a fractional kirchhoff problem involving a singular term and critical non linearity. By combining variational methods with an appropriate truncation argumantenKirchhoff problem, positve weak solution, singular term, critical exponant, minimization method.Thesis