Coconvex polynomial approximation
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D. Leviatan; I.A. Shevchuk
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Article
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2003
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Elsevier Science
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English
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Let f ACยฝร1; 1 change its convexity finitely many times, in the interval. We are interested in estimating the degree of approximation of f by polynomials, and by piecewise polynomials, which are coconvex with it, namely, polynomials and piecewise polynomials that change their convexity exactly at th