Orthogonal FunctionsDover Publications, 1 janv. 2004 - 411 pages Easy to read but rigorous in its attention to detail and technique, this graduate-level text covers expansion in a series of orthogonal functions and preliminary notions of Hilbert space, expansion in Fourier series and in series of Legendre polynomials and spherical harmonics, and expansions in Laguerre and Hermite series. |