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arXiv 1502.01875math.FAmath.GN
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球上和有限集空间上的扩张算子

Extension operators on balls and on spaces of finite sets

Antonio Avilés, Witold Marciszewski

摘要:

研究了基数至多为$n$的$X$的子集的空间$σ_n(2^X)$之间的扩张算子.作为应用,我们证明了如果$B_H$是不可分希尔伯特空间$H$的单位球,且具有弱拓扑,则对任何$0<λ<μ$,不存在扩张算子$T: C(λB_H)\to C(μB_H)$ .

英文摘要:

We study extension operators between spaces $σ_n(2^X)$ of subsets of $X$ of cardinality at most $n$. As an application, we show that if $B_H$ is the unit ball of a nonseparable Hilbert space $H$, equipped with the weak topology, then, for any $0<λ<μ$, there is no extension operator $T: C(λB_H)\to C(μB_H)$.

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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