Compactness of Commutators for Singular Integrals on Morrey Spaces

Compactness of Commutators for Singular Integrals on Morrey Spaces
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Morrey 空间上奇异积分换向器的紧性

DOI:
10.4153/cjm-2011-043-1
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发表时间:
2012-03
期刊:
Canadian Journal of Mathematics
影响因子:
--
通讯作者:
Wang, Xinxia
Wang, Xinxia
中科院分区:
其他
文献类型:
--
作者:
Chen, Yanping;Ding, Yong;Wang, Xinxia

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本文刻画了Morrey空间${L}^{p,\lambda}\Left({{\mathbb{R}}^{n}}\Right)上奇异积分算子交换子$Left[b,Tright]$的紧性.更确切地说,我们证明了如果$b\,\in\,\Text{vmo}\Left({{\mathbb{R}^{n}}\Right)$,$\Text{bmo}\Left({{\mathbb{R}}^{n}}\Right)$-闭包$C_{c}^{\Infty}\Left({{\mathbb{R}}^{n}}\Right)$,则$\Left[b,\,T[右]$是Morrey空间${{L}^{p,\lambda}}\Left({{\mathbb{R}}^{n}}\right)$上的紧算子,对$1,<和$0、<\、\lambda\、<\、n$。反之,如果$b\,\in\Text{bmo}\Left({{\mathbb{R}^{n}}\right)$和$\Left[b,\,T\right]$是${{L}^{p,\lambda}\Left({{\mathbb{R}}^{n}}\right)$上的紧运算符,则$p,\Left(1,<\,p\,<,\inty\right)$,然后是$b\,\in\,\Text{vmo}\Left({{\mathbb{R}}^{n}}\Right)$。此外,还给出了粗糙奇异积分算子$T$及其交换子$Left[b,Tright]$在${L}^{p,\lambda}\Left({{\mathbb{R}}^{n}}\right)$上的有界性.我们得到了Morrey空间中的一个子集是强预紧集的一个充分条件,它本身就是有意义的。
Abstract In this paper we characterize the compactness of the commutator $\left[ b,\,T \right]$ for the singular integral operator on the Morrey spaces ${{L}^{p,\lambda }}\left( {{\mathbb{R}}^{n}} \right)$ . More precisely, we prove that if $b\,\in \,\text{VMO}\left( {{\mathbb{R}}^{n}} \right)$ , the $\text{BMO}\left( {{\mathbb{R}}^{n}} \right)$ -closure of $C_{c}^{\infty }\left( {{\mathbb{R}}^{n}} \right)$ , then $\left[ b,\,T \right]$ is a compact operator on the Morrey spaces ${{L}^{p,\lambda }}\left( {{\mathbb{R}}^{n}} \right)$ for $1\,<\,p\,<\,\infty $ and $0\,<\,\lambda \,<\,n$ . Conversely, if $b\,\in \,\text{BMO}\left( {{\mathbb{R}}^{n}} \right)$ and $\left[ b,\,T \right]$ is a compact operator on the ${{L}^{p,\lambda }}\left( {{\mathbb{R}}^{n}} \right)$ for some $p\,\left( 1\,<\,p\,<\,\infty \right)$ , then $b\,\in \,\text{VMO}\left( {{\mathbb{R}}^{n}} \right)$ . Moreover, the boundedness of a rough singular integral operator $T$ and its commutator $\left[ b,\,T \right]$ on ${{L}^{p,\lambda }}\left( {{\mathbb{R}}^{n}} \right)$ are also given. We obtain a sufficient condition for a subset in Morrey space to be a strongly pre-compact set, which has interest in its own right.
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