发表机构
Massachusetts Institute of Technology(麻省理工学院)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
研究用三角多项式逼近利普希茨函数时杰克逊定理的改进,精确刻画其主要误差项,还对核多项式方法中相关构造做同样研究,该构造在这方面比杰克逊构造稍好。
AI 中文摘要
我们证明了关于用三角多项式逼近利普希茨函数的杰克逊定理的一个改进。我们的结果精确地刻画了与杰克逊构造相关的主要误差项。对于谱密度估计的核多项式方法中常用的一种相关构造,我们也做了同样的事情,在这方面它比杰克逊构造稍好。
英文摘要
We prove a refinement of Jackson's theorem on the approximation of Lipschitz functions by trigonometric polynomials. Our result precisely characterizes the leading error term associated with Jackson's construction. We do the same for a related construction commonly used in the kernel polynomial method for spectral density estimation, which is slightly better than Jackson's construction in this respect.
Comments7 pages, incorporated revisions, accepted by Applied Mathematics Letters