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arXiv 2007.05734math.FA
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巴拿赫格中的无界连续算子和无界Banach-Saks性质

Unbounded continuous operators and unbounded Banach-Saks property in Banach lattices

Omid Zabeti

摘要:

受巴拿赫空间上连续算子的弱零网等价定义的启发,引入了无界连续算子,将巴拿赫格上连续算子的定义中的弱收敛替换为无界绝对弱收敛($uaw$ -收敛).利用这些算子空间刻画了序连续巴拿赫格和自反巴拿赫格.此外,受无界绝对弱Cauchy序列刻画自反Banach格的启发,我们考虑了巴拿赫格之间的预无界算子,它将$uaw$ -Cauchy序列映射到弱($uaw$ -或范数)收敛序列.这使得我们可以用这些算子来刻画$KB$ -空间和自反空间。进一步,我们将无界Banach-Saks性质看作是弱Banach-Saks性质的无界形式.具有无界Banach-Saks性质的空间与满足不同类型已知Banach-Saks性质的空间之间有许多相当重要的关系。特别是,我们刻画了顺序连续巴拿赫格在这些关系,以及。

英文摘要:

Motivated by the equivalent definition of a continuous operator between Banach spaces in terms of weakly null nets, we introduce unbounded continuous operators by replacing weak convergence with the unbounded absolutely weak convergence ( $uaw$-convergence) in the definition of a continuous operator between Banach lattices. We characterize order continuous Banach lattices and reflexive Banach lattices in terms of these spaces of operators. Moreover, motivated by characterizing of a reflexive Banach lattice in terms of unbounded absolutely weakly Cauchy sequences, we consider pre-unbounded operators between Banach lattices which maps $uaw$-Cauchy sequences to weakly ( $uaw$- or norm) convergent sequences. This allows us to characterize $KB$-spaces and reflexive spaces in terms of these operators, too. Furthermore, we consider the unbounded Banach-Saks property as an unbounded version of the weak Banach-Saks property. There are many considerable relations between spaces possessing the unbounded Banach-Saks property with spaces fulfilled by different types of the known Banach-Saks property. In particular, we characterize order continuous Banach lattices in terms of these relations, as well.

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