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arXiv 2406.07656math.FAmath.OA
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解析Toeplitz算子的极小换位子与双换位子性质

Minimal commutant and double commutant property for analytic Toeplitz operators

María José González, Fernando León-Saavedra

AI总结:

该数学研究给出了解析Toeplitz算子换位子极小性的等价刻画,并将其应用于判定整函数及Thomson-Cowen类符号对应的算子双换位子极小性。

摘要:

本文研究定义在Hardy空间$H^2(\mathbb{D})$上的解析Toeplitz算子$M_\varphi$换位子的极小性,其中$\varphi\in H^\infty(\mathbb{D})$表示$\mathbb{D}$上的有界解析函数。具体而言,我们证明$M_\varphi$的换位子是极小的当且仅当$\varphi$的多项式在$H^\infty(\mathbb{D})$中弱星稠密,即$\varphi$是$H^\infty(\mathbb{D})$的弱星生成元。我们利用该结果刻画了一大类符号$\varphi$对应的解析Toeplitz算子$M_\varphi$的双换位子何时是极小的,即当$\varphi$是整函数,或更一般地属于Thomson-Cowen类时。

英文摘要:

In this paper we study the minimality of the commutant of an analytic Toeplitz operator $M_φ$, when $M_φ$ is defined on the Hardy space $H^2(\mathbb{D})$ and $φ\in H^\infty(\mathbb{D})$, denotes a bounded analytic function on $\mathbb{D}$. Specifically we show that the commutant of $M_φ$ is minimal if and only if the polynomials on $φ$ are weak-star dense in $H^\infty(\mathbb{D})$, that is, $φ$ is a weak-star generator of $H^\infty(\mathbb{D})$. We use our result to characterize when the double commutant of an analytic Toeplitz operator $M_φ$ is minimal, for a large class of symbols $φ$. Namelly, when $φ$ is an entire function, or more generally when $φ$ belongs to the Thomson-Cowen's class.

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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