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arXiv 1808.08641math.CA
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由牛顿核位移得到的调和函数的非线性$n$ -项逼近

Nonlinear $n$-term approximation of harmonic functions from shifts of the Newtonian Kernel

Kamen Ivanov, Pencho Petrushev

摘要:

经典位势论中的一个基本组成部分是${\mathbb R}^d$(牛顿核)中拉普拉斯方程的基本解。本文的主要目的是研究调和Hardy空间中极点在$\overline{B^d}$外的牛顿核的移位对单位球$B^d$上的调和函数的非线性$n$ -项逼近的速率.最佳的逼近速度得到的调和Besov空间。在建立这些结果的主要车辆是建设的高度本地化的框架Besov和Triebel-Lizorkin空间上的球的元素是线性组合的一个固定数目的移位的牛顿核。

英文摘要:

A basic building block in Classical Potential Theory is the fundamental solution of the Laplace equation in ${\mathbb R}^d$ (Newtonian kernel). The main goal of this article is to study the rates of nonlinear $n$-term approximation of harmonic functions on the unit ball $B^d$ from shifts of the Newtonian kernel with poles outside $\overline{B^d}$ in the harmonic Hardy spaces. Optimal rates of approximation are obtained in terms of harmonic Besov spaces. The main vehicle in establishing these results is the construction of highly localized frames for Besov and Triebel-Lizorkin spaces on the sphere whose elements are linear combinations of a fixed number of shifts of the Newtonian kernel.

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