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Whitney inequality : ウィキペディア英語版 | Whitney inequality In mathematics, the Whitney inequality gives an upper bound for the error of best approximation of a function by polynomials in terms of the moduli of smoothness. It was first proved by Hassler Whitney in 1957, and is an important tool in the field of approximation theory for obtaining upper estimates on the errors of best approximation. ==Statement of the theorem==
Denote the value of the best uniform approximation of a function by algebraic polynomials of degree by : : where is the finite difference of order . Theorem: (1957 ) If , then : where is a constant depending only on . The Whitney constant is the smallest value of for which the above inequality holds. The theorem is particularly useful when applied on intervals of small length, leading to good estimates on the error of spline approximation.
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