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arXiv 2302.00550math.FA
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关于算子广义最大数值域的一个注记

A note on the generalized maximal numerical range of operators

Abderrahim Baghdad, El Hassan Benabdi, Kais Feki

摘要:

本文研究了作用在复希尔伯特空间$A$上的正有界线性算子的最大数值域(记作$A$)的一些新性质.给出了$A$ -范仿体算子的一些特征.特别是,我们延长了最近由Spitkovsky在[歌剧。矩阵,13,3(2019)]。即证明了作用于$\mathcal{H}$的$A$ -有界线性算子$T$是$A$ -normaloid当且仅当$W_{\max}^A(T)\cap \partial W_A(T)\neq\varnothing$ .这里$\partial W_A(T)$代表$A$的边界-$T$的数值域。给出了一些新的$A$ -数值半径不等式,推广和改进了以前的一些著名结果.

英文摘要:

The paper considers some new properties of the so-called $A$-maximal numerical range of operators, denoted by $W_{\max}^A(\cdot)$, where $A$ is a positive bounded linear operator acting on a complex Hilbert space $\mathcal{H}$. Some characterizations of $A$-normaloid operators are also given. In particular, we extend a recent recent by Spitkovsky in [Oper. Matrices, 13, 3(2019)]. Namely, it is shown that an $A$-bounded linear operator $T$ acting on $\mathcal{H}$ is $A$-normaloid if and only if $W_{\max}^A(T)\cap \partial W_A(T)\neq\varnothing$. Here $\partial W_A(T)$ stands for the boundary of $A$-numerical range of $T$. Some new $A$-numerical radius inequalities generalizing and improving earlier well-known results are also given.

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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