利用切比雪夫多项式网格在立方体、单纯形和球体上评估勒贝格常数
Evaluating Lebesgue constants by Chebyshev polynomial meshes on cube, simplex and ball
AI总结:
本文提出利用乘积型切比雪夫多项式网格以完全离散方式在立方体、单纯形和球体上严格评估勒贝格常数,覆盖插值、超插值和加权最小二乘等投影算子,并提供免费数值软件包。
摘要:
我们证明,乘积型切比雪夫多项式网格可以以一种完全离散的方式,用于在严格误差界下评估勒贝格常数,即勒贝格函数的最大值,适用于立方体、单纯形和球体上的一类多项式投影算子,包括插值、超插值和加权最小二乘。文中给出了若干示例,并概述了可能的推广。实现该方法的数值软件包可在网上免费获取。
英文摘要:
We show that product Chebyshev polynomial meshes can be used, in a fully discrete way, to evaluate with rigorous error bounds the Lebesgue constant, i.e. the maximum of the Lebesgue function, for a class of polynomial projectors on cube, simplex and ball, including interpolation, hyperinterpolation and weighted least-squares. Several examples are presented and possible generalizations outlined. A numerical software package implementing the method is freely available online.
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。