Harmonic Analysis and Boundary Value Problems in the Complex Domain - M.M. Djrbashian - Bog

That interfusion turned out to have great advan tages and gave rise to a vast number of significant results, of which we want to mention especially the classical results on the theory of Fourier series in L2 ( -7r, 7r) and their continual analog - Plancherel's theorem on the Fourier transform in L2 ( -00, +00).