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Webbed space : ウィキペディア英語版 | Webbed space In mathematics, particularly in functional analysis, a webbed space is a topological vector space designed with the goal of allowing the results of the open mapping theorem and the closed graph theorem to hold for a wider class of linear maps. A space is called webbed if there exists a collection of sets, called a ''web'' that satisfies certain properties. Webs were first investigated by de Wilde. ==Web==
Let ''X'' be a Hausdorff locally convex topological vector space. A web is a stratified collection of disks satisfying the following absorbency and convergence requirements. The first stratum must consist of a sequence of disks in ''X'', denoted by , such that . For each disk in the first stratum, there must exists a sequence of disks in ''X'', denote by such that and absorbs . This sequence of sequences will form the second stratum. To each disk in the second stratum we assign another sequence of disks with analogously defined properties. This process continuous for countably many strata. A strand is a sequence of disks, with the first disk being selected from the first stratum, say , and the second being selected from the sequence that was associated with , and so on. We also require that if a sequence of vectors is selected from a strand (with belonging to the first disk in the strand, belonging to the second, and so on) then the series converges. A Hausdorff locally convex topological vector space on which a web can be defined is called a webbed space.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Webbed space」の詳細全文を読む
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