Bouzitouna , AhlemOuaoua , Amar2025-07-232025-07-232022http://dspace.univ-skikda.dz:4000/handle/123456789/5023In this memory, First, we defined the classi¢ cation of partial differential equation and canonical forms, we also exposed same theorems and de¢ nitions which has importants rolein the sequel. Finally we are going to solve a class of hyperbolic equation, the essential but is study the existence and uniquess of the solution, also, we study the behavionr of the solution use the energy method.enMasters degree Thesis