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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 f\in C(()) by algebraic polynomials P_n of degree \leq n by
: E_n(f)_ := \inf_ \|\Delta_h^k(f;\cdot)\|_ \quad \text \quad t\in (),
: \omega_k(t):=\omega_k((b-a)/k)\quad \text \quad t>(b-a)/k ,
where \Delta_h^k is the finite difference of order k.
Theorem: (1957 ) If f\in C(()), then
: E_(f)_\leq W_k \omega_k\left(\frac;f;()\right)
where W_k is a constant depending only on k. The Whitney constant W(k) is the smallest value of W_k 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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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