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arXiv 1602.05036math.CA
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Hölder空间中函数的代数多项式逼近

On approximation of functions by algebraic polynomials in Hölder spaces

Yurii Kolomoitsev, Tetiana Lomako, Jürgen Prestin

摘要:

本文研究了Hölder空间中函数的代数多项式逼近问题,它对应于广义Jacobi平移和Ditzian-Totik光滑模。通过对经典光滑模的修正,改进了逼近的正逆定理,并证明了在这些空间中最佳逼近精确降阶的准则.此外,我们还得到了一些函数逼近方法的强逆不等式。作为一个例子,我们考虑Durrmeyer-伯恩斯坦多项式算子的逼近。

英文摘要:

We study approximation of functions by algebraic polynomials in the Hölder spaces corresponding to the generalized Jacobi translation and the Ditzian-Totik moduli of smoothness. By using modifications of the classical moduli of smoothness, we give improvements of the direct and inverse theorems of approximation and prove the criteria of the precise order of decrease of the best approximation in these spaces. Moreover, we obtain strong converse inequalities for some methods of approximation of functions. As an example, we consider approximation by the Durrmeyer-Bernstein polynomial operators.

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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