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Coconvex approximation of functions of several variables by polynomials. (English. Russian original) Zbl 0506.41005

Math. USSR, Sb. 43, 515-526 (1982); translation from Mat. Sb., Nov. Ser. 115(157), 577-589 (1981).

MSC:

41A10 Approximation by polynomials
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
41A17 Inequalities in approximation (Bernstein, Jackson, Nikol’skiń≠-type inequalities)
26A15 Continuity and related questions (modulus of continuity, semicontinuity, discontinuities, etc.) for real functions in one variable
52A40 Inequalities and extremum problems involving convexity in convex geometry
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