SAKHER, Ilham2024-10-212024-10-212024-06-09http//localhost:8080/jspui/handle/123456789/12139In this work we are concerned to prove the existence, uniqueness and the continuous dependance of a strong solution upon the data of some mixed problems with classical ( Dirichlet, Neumann) and integral conditions for a hyperbolic class of equations and for a hyperbolic system. In a first case, we treate a mixed problem with purely classical conditions and in a second case we combine a classical and an integral condition. In our proofs, we use functionnal analysis method.enThesis