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Orthonormal expansions of angular momentum functions. (English) Zbl 0334.42017

MSC:

42A32 Trigonometric series of special types (positive coefficients, monotonic coefficients, etc.)
42C05 Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis
42A70 Trigonometric moment problems in one variable harmonic analysis
41A50 Best approximation, Chebyshev systems
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