Abstract
An estimate is obtained for the approximation of convex functions of two variables with bounded second derivatives on a disk by convex algebraic polynomials.
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References
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 46, No. 9, pp. 1115–1122, September, 1994.
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Budnik, V.G. Coapproximation of functions convex on a disk by algebraic polynomials. Ukr Math J 46, 1225–1234 (1994). https://doi.org/10.1007/BF01059414
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DOI: https://doi.org/10.1007/BF01059414