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arXiv 1403.0477math.CAmath.FA
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$\mathbb{R}$上逼近多项式的高阶导数

Higher order derivatives of approximation polynomials on $\mathbb{R}$

Hee Sun Jung, Ryozi Sakai

摘要:

D. Leviatan研究了可微函数$f$在$[-1,1]$上的逼近多项式的高阶导数的性质。特别地,当$P_n$是$f$的最佳逼近时,他估计了差异$\|f^{(k)}-P_n^{(k)}\|_{L_\infty([-1,1])}$,$k=0,1,2,...$。本文给出了它们关于$\mathbb{R}$上可微函数的类比,并将结果应用于单调逼近。

英文摘要:

D. Leviatan has investigated the behavior of the higher order derivatives of approximation polynomials of the differentiable function $f$ on $[-1,1]$. Especially, when $P_n$ is the best approximation of $f$, he estimates the differences $\|f^{(k)}-P_n^{(k)}\|_{L_\infty([-1,1])}$, $k=0,1,2,...$. In this paper, we give the analogies for them with respect to the differentiable functions on $\mathbb{R}$, and we apply the result to the monotone approximation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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