Geodesic
Pointwise estimates from below of the moduli of the derivatives of orthogonal polynomials on of the derivatives of orthogonal polynomials on
Sbornik. Mathematics, Tome 186 (1995) no. 6, pp. 771-781 Cet article a éte moissonné depuis la source Math-Net.Ru

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A result of the author is generalized concerning pointwise estimates from below of the derivatives of algebraic polynomials that are orthogonal on the circle with a weight whose singularities are constructed from the products of powers of concave moduli of continuity. 
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V. M. Badkov. Pointwise estimates from below of the moduli of the derivatives of orthogonal polynomials on of the derivatives of orthogonal polynomials on. Sbornik. Mathematics, Tome 186 (1995) no. 6, pp. 771-781. http://geodesic.mathdoc.fr/item/SM_1995_186_6_a0/

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