42C05  Orthogonal functions and polynomials, general theory [See also 33C45, 33C50, 33D45]


42C10  Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.)


42C15  Series of general orthogonal functions, generalized Fourier expansions, nonorthogonal expansions


42C20  Rearrangements and other transformations of Fourier and other orthogonal series


42C25  Uniqueness and localization for orthogonal series


42C30  Completeness of sets of functions


42C40  Wavelets


42C99  None of the above, but in this section

