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arXiv 2101.00552math.FA
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调和Bergman空间的正交补上的亚正规对偶Toeplitz算子

Hyponormal dual Toeplitz operators on the orthogonal complement of the Harmonic Bergman space

Chongchao Wang, Xianfeng Zhao

摘要:

本文主要研究调和Bergman空间的正交补上对偶Toeplitz算子的亚正规性。首先证明了符号有界的对偶Toeplitz算子是亚正规的当且仅当它是正规的。得到了符号为$φ(z) = az^{n_1}\overline{z}^{m_1} + bz^{n_2} \overline{z}^{m_2}$,$(n_1,n_2,m_1,m_2\in \mathbb {N}$和$a,b \in \mathbb{C})$的对偶Toeplitz算子$S_φ$是亚正规的充要条件.最后,证明了两个对偶Toeplitz算子的换位子的秩必为偶数,若换位子有有限秩.

英文摘要:

In this paper, we mainly study the hyponormality of dual Toeplitz operators on the orthogonal complement of the harmonic Bergman space. First we show that the dual Toeplitz operator with bounded symbol is hyponormal if and only if it is normal. Then we obtain a necessary and sufficient condition for the dual Toeplitz operator $S_φ$ with the symbol $φ(z) = az^{n_1}\overline{z}^{m_1} + bz^{n_2} \overline{z}^{m_2}$, $(n_1,n_2,m_1,m_2\in \mathbb {N}$ and $a,b \in \mathbb{C})$ to be hyponormal. Finally, we show that the rank of the commutator of two dual Toeplitz operators must be an even number if the commutator has a finite rank.

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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