局部波尔洛巴斯类型属性的弱化与巴拿赫空间的几何学

IF 0.5 Q3 MATHEMATICS ACTA SCIENTIARUM MATHEMATICARUM Pub Date : 2023-09-18 DOI:10.1007/s44146-023-00095-6
Uday Shankar Chakraborty
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引用次数: 0

摘要

本文讨论的是所谓算子性质的弱形式,我们称之为算子的弱 \({\textbf {L}}_{o,o}\) 性质。我们用近似规范达到集的收敛性来描述这一性质,并证明一对巴拿赫空间(X,Y)满足紧凑算子的弱({\textbf {L}}_{o,o}\ )性质,当且仅当 X 是反折的。我们进一步研究了双线性映射的弱 \({\textbf {L}}_{o,o}\) 性质,并得到了它与算子的弱 \({\textbf {L}}_{o,o}\) 性质的联系。重要的是,我们还借助近似规范达到集的收敛性描述了巴拿赫空间的一些几何性质。
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Weakening of a local Bollobás type property and geometry of Banach spaces

This paper deals with a weaker form of the property so called \({\textbf {L}}_{o,o}\) for operators, which we call the property weak \({\textbf {L}}_{o,o}\) for operators. We characterize this property in terms of convergence of approximate norm attainment sets and prove that a pair of Banach spaces (XY) satisfies the property weak \({\textbf {L}}_{o,o}\) for compact operators if and only if X is reflexive. We further investigate the property weak \({\textbf {L}}_{o,o}\) for bilinear maps and obtain a connection of it with the property weak \({\textbf {L}}_{o,o}\) for operators. Importantly, we also characterize some geometric properties of Banach spaces with the help of convergence of approximate norm attainment sets.

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