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. Unabridged republication of the edition published by Interscience Publishers, Inc., New York, 1959.
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Functional Analysis by George Bachman, Lawrence Narici Text covers introduction to inner-product spaces, normed, metric spaces, and topological spaces; complete orthonormal sets, the Hahn-Banach Theorem and its consequences, and many other related subjects. 1966 edition.