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Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.), Approximation by arbitrary linear expressions, Multidimensional problems, Positive definite functions in one variable harmonic analysis, Completeness of sets of functions in one variable harmonic analysis, Approximation by other special function classes, Completeness of sets of functions in nontrigonometric harmonic analysis
Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.), Approximation by arbitrary linear expressions, Multidimensional problems, Positive definite functions in one variable harmonic analysis, Completeness of sets of functions in one variable harmonic analysis, Approximation by other special function classes, Completeness of sets of functions in nontrigonometric harmonic analysis
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