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Direct and converse theorems of Jackson type in \(L^p\) spaces, \(0<p<1\). (English) Zbl 0372.41004

MSC:
41A10 Approximation by polynomials
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
42A10 Trigonometric approximation
41A50 Best approximation, Chebyshev systems
42C05 Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis
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