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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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