scientific article; zbMATH DE number 3398114
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Publication:5665630
zbMath0252.42013MaRDI QIDQ5665630
Publication date: 1969
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Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.) (42C10) Best approximation, Chebyshev systems (41A50) Multidimensional problems (41A63) Approximation by polynomials (41A10)
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