Abstract
Theorems of Jackson type are given, for the simultaneous approximation of a function of class Cm and its partial derivatives, by a polynomial and the corresponding partial derivatives.
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Communicated by Edward B. Saff.
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Bagby, T., Bos, L. & Levenberg, N. Multivariate simultaneous approximation. Constr. Approx. 18, 569–577 (2002). https://doi.org/10.1007/s00365-001-0024-6
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DOI: https://doi.org/10.1007/s00365-001-0024-6