42Cxx Nontrigonometric Fourier analysis
- 42C05 Orthogonal functions and polynomials, general theory, See also {33A65, 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
- 42C99 None of the above but in this section
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