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The degree of approximation by polynomials with positive coefficients. (English) Zbl 0116.04602

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[1] Jurkat, W. B., andG. G. Lorentz: Uniform approximation by polynomials with positive coefficients. Duke Math. J.28, 463-474 (1961). · Zbl 0112.29002
[2] Korovkin, P. P.: On the order of approximation of functions by positive linear operators. (Russian) Dokl. Akad. Nauk SSSR114, 1158-1161 (1957). · Zbl 0084.06104
[3] Lorentz, G. G.: Zur Theorie der Polynome vonS. Bernstein. Mat. Sbornik (N.S.),2, 543-556 (1937). · Zbl 0017.39502
[4] ?? Bernstein polynomials. Toronto: Univ. of Toronto Press 1953.
[5] Natanson, I. P.: Konstruktive Funktionentheorie. Berlin: Akademie-Verlag 1955. · Zbl 0065.29502
[6] Timan, A. F.: Theory of approximation of functions of a real variable (Russian). Moscow: Gosizdat 1960. · Zbl 0129.04202
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