Meryem, KhaldouneSupervisor: Abdelhak, Mokhtari2025-07-072025-07-072025-06-15https://repository.univ-msila.dz/handle/123456789/46666This m´emoire investigates the existence and multiplicity of solutions for a class of nonlinear fractional differential equations of Kirchhoff type involving the fractional p-Laplacian operator. The study is conducted within a variational framework, relying on tools from critical point theory and nonlinear analysis.enexistencemultiplicitynonlinear fractionaldifferential equationsKirchhoff type involvingfractional p-Laplacian operatorThesis