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Obere Schranken der besten einseitigen Approximationen der Klassen \(W^rL_\Psi\) in der \(L\)-Metrik. (Russian) Zbl 0365.42001

MSC:
42A10 Trigonometric approximation
41A10 Approximation by polynomials
41A50 Best approximation, Chebyshev systems
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