This project discusses the concept of Fourier transform of a function in Space with itsrnproperties theorem, inversion theorem, Fourier sine and cosine transforms theorem, Plancherel’srnand Parseval’s identities theorem and the applications of Fourier transform in partial differentialrnequations, Shannon’s sampling theorem and Heisenberg’s inequality.rnTherefore the purpose of this project is to solving certain problems in partial differentialrnequations like for example Heat equation, Wave equation , and Laplace equation, to solve somerncomplicated integrals shortly and simply, and it works in Shannon’s sampling theorem andrnHeisenberg’s inequality.rnThis project uses some definitions and theorems as a preliminary from some real analysis andrnFourier analysis books