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arXiv 1709.02698math.AP
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Besov和Triebel-Lizorkin空间的点态乘法

Pointwise multiplication of Besov and Triebel--Lizorkin spaces

Jon Johnsen

摘要:

它示出,para-multiplication适用于一定的产品$π(u,v)$定义为适当的温带分布$u$和$v$。研究了各向异性Besov和Triebel-Lizorkin空间中$π(\cdot,\cdot)$的有界性,更精确地说,研究了$B^{M,s}_{p,q}$和$F^{M,s}_{p,q}$与$s\in\mathbb{R}$、$p$和$q\in\,]0,\infty]$的有界性,尽管$p<\infty$是在$F$ -情形下的有界性.一般以及各种边缘情况下处理。$π(\cdot,\cdot)$适用的空间$B^{M,s_0}_{p_0,q_0}\oplus B^{M,s_1}_{p_1,q_1}$和$F^{M,s_0}_{p_0,q_0}\oplus F^{M,s_1}_{p_1,q_1}$在情况$\max(s_0,s_1)>0$中确定。对于一般各向同性空间$F^{s_0}_{p_0,q_0}\oplus F^{s_1}_{p_1,q_1}$的接收$F^{s}_{p,q}$空间的特点。证明了当$f\cdot g$局部可积时,$π(f,g)=f\cdot g$对函数$f$和$g$成立.此外,当$f$是多项式增长的并且$u$是温和的时,$π(f,u)=fu$。此外,对于欧氏空间中的任意开集$Ω$,通过提升到$\mathbb{R}^n$来定义乘积$π_Ω(\cdot,\cdot)$。$π$对$\mathbb{R}^n$的有界性一般会转移到$π_Ω$。

英文摘要:

It is shown that para-multiplication applies to a certain product $π(u,v)$ defined for appropriate temperate distributions $u$ and $v$. Boundedness of $π(\cdot,\cdot)$ is investigated for the anisotropic Besov and Triebel--Lizorkin spaces, more precisely for $B^{M,s}_{p,q}$ and $F^{M,s}_{p,q}$ with $s\in\mathbb{R}$ and $p$ and $q\in\,]0,\infty]$, though $p<\infty$ in the $F$-case. Both generic as well as various borderline cases are treated. The spaces $B^{M,s_0}_{p_0,q_0}\oplus B^{M,s_1}_{p_1,q_1}$ and $F^{M,s_0}_{p_0,q_0}\oplus F^{M,s_1}_{p_1,q_1}$ to which $π(\cdot,\cdot)$ applies are determined in the case $\max(s_0,s_1)>0$. For generic isotropic spaces $F^{s_0}_{p_0,q_0}\oplus F^{s_1}_{p_1,q_1}$ the receiving $F^{s}_{p,q}$ spaces are characterised. It is proved that $π(f,g)=f\cdot g$ holds for functions $f$ and $g$ when $f\cdot g$ is locally integrable, roughly speaking. In addition, $π(f,u)=fu$ when $f$ is of polynomial growth and $u$ is temperate. Moreover, for an arbitrary open set $Ω$ in Euclidean space, a product $π_Ω(\cdot,\cdot)$ is defined by lifting to $\mathbb{R}^n$. Boundedness of $π$ on $\mathbb{R}^n$ is shown to carry over to $π_Ω$ in general.

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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