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arXiv 2104.00435math.FA
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几乎和算子的一些性质

Some properties of almost summing operators

Renato Macedo, Joedson Santos

摘要:

本文推广了绝对和算子线性理论中三个重要结果的适用范围。第一个是Bu和Kranz在\cite{BK}中证明的,它断言Banach空间之间的连续线性算子对于任何$q\geq2$,只要它的伴随是对某个$p\geq1$的$p$ -和,则几乎无条件可和序列成为Cohen强$q$ -可和序列。第二个结果是由Bu \cite{Bu}得到的,证明了Hilbert整环上的$p$-求和算子是Cohen强$q$ -求和算子($1<p,q<\infty$).第三个是由于Kwapiestan \cite{Kwapien}和它的特点空间同构的Hilbert空间使用2-求和算子。我们将证明,这些结果保持替换的假设的运营商是$p$ -求和几乎求和。我们还将给出一个几乎求和运算符的例子,该运算符对于每个$1\leq p< \infty$都不是$p$求和。

英文摘要:

In this paper we extend the scope of three important results of the linear theory of absolutely summing operators. The first one was proved by Bu and Kranz in \cite{BK} and it asserts that a continuous linear operator between Banach spaces takes almost unconditionally summable sequences into Cohen strongly $q$-summable sequences for any $q\geq2$, whenever its adjoint is $p$-summing for some $p\geq1$. The second of them states that $p$-summing operators with hilbertian domain are Cohen strongly $q$-summing operators ($1<p,q<\infty$), this result is due to Bu \cite{Bu}. The third one is due to Kwapień \cite{Kwapien} and it characterizes spaces isomorphic to a Hilbert space using 2-summing operators. We will show that these results are maintained replacing the hypothesis of the operator to be $p$-summing by almost summing. We will also give an example of an almost summing operator that fails to be $p$-summing for every $1\leq p< \infty$.

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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