1-Defines L_{p} spaces, Schwartz space and Fourier transform. 2- Investigates the Fourier transforms of the sine and cosine function, continuity and differential properties of the Fourier transform. 3-Interprets the Riemann-Lebesgue theorems, essential properties of direct and inverse Fourier transforms in the L_{1} space. 4-Interprets the Plancherel theory in the L_{2} space, generalized functions and their Fourier transform |