Mathematical Sciences Classification System
42Cxx - Nontrigonometric harmonic analysis
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42C05
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42C10Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.)
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42C15General harmonic expansions, frames
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42C20Other transformations of harmonic type
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42C25Uniqueness and localization for orthogonal series
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42C30Completeness of sets of functions
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42C40Wavelets and other special systems
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42C99None of the above, but in this section