里兹投影的点阵梯度估计

IF 2.8 2区数学 Q1 MATHEMATICS, APPLIED

SIAM Journal on Numerical Analysis Pub Date : 2024-05-21 DOI:10.1137/23m1571800

Lars Diening, Julian Rolfes, Abner J. Salgado

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引用次数: 0

摘要

SIAM 数值分析期刊》第 62 卷第 3 期第 1212-1225 页，2024 年 6 月。摘要设 [math] 是一个凸多胞形（[math]）。里兹投影是有限元空间中给定函数在[math]正态下的最佳近似值。当这种有限元空间是基于准均匀三角形构造时，我们展示了对里兹投影的点估计。也就是说，[math]中任意点的梯度受同一点上原始函数梯度的哈代-利特尔伍德最大函数控制。从这一估计出发，Ritz 投影在 PDE 分析中感兴趣的各种空间上的稳定性也随之而来。其中包括加权空间、奥利奇空间和洛伦兹空间。

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Pointwise Gradient Estimate of the Ritz Projection

SIAM Journal on Numerical Analysis, Volume 62, Issue 3, Page 1212-1225, June 2024.
Abstract. Let [math] be a convex polytope ([math]). The Ritz projection is the best approximation, in the [math]-norm, to a given function in a finite element space. When such finite element spaces are constructed on the basis of quasiuniform triangulations, we show a pointwise estimate on the Ritz projection. Namely, the gradient at any point in [math] is controlled by the Hardy–Littlewood maximal function of the gradient of the original function at the same point. From this estimate, the stability of the Ritz projection on a wide range of spaces that are of interest in the analysis of PDEs immediately follows. Among those are weighted spaces, Orlicz spaces, and Lorentz spaces.

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来源期刊

SIAM Journal on Numerical Analysis 数学-应用数学

CiteScore

4.80

自引率

6.90%

发文量

110

审稿时长

4-8 weeks

期刊介绍： SIAM Journal on Numerical Analysis (SINUM) contains research articles on the development and analysis of numerical methods. Topics include the rigorous study of convergence of algorithms, their accuracy, their stability, and their computational complexity. Also included are results in mathematical analysis that contribute to algorithm analysis, and computational results that demonstrate algorithm behavior and applicability.