Duffin and Schaeffer Type Inequality for
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Borislav Bojanov; Geno Nikolov
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Article
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1996
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Elsevier Science
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English
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## We show that in the uniform norm for every real algebraic polynomial f of degree n which satisfies the inequalities | f (x)| |P (:, :) n (x)| at the points x of local extrema of the ultraspherical polynomial P (:, :) n in [&1, 1].