New estimates related with the best polynomial approximation

J. Bustamante
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Abstract

In some old results, we find estimates the best approximation \(E_{n,p}(f)\) of a periodic function satisfying \(f^{(r)}\in\mathbb{L}^p_{2\pi}\) in terms of the norm of \(f^{(r)}\) (Favard inequality). In this work, we look for a similar result under the weaker assumption \(f^{(r)}\in \mathbb{L}^q_{2\pi}\), with \(1
与最佳多项式近似有关的新估计
在一些旧的结果中,我们发现估计一个周期函数的最佳逼近\(E_{n,p}(f)\)满足\(f^{(r)}\in\mathbb{L}^p_{2\pi}\)的范数\(f^{(r)}\) (Favard不等式)。在这项工作中,我们在\(1
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