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Uniform bounds for limited sets and applications to bounding sets

机译:有限集和边界集应用的统一边界

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摘要

A set D in a Banach space E is limited if lim sup_(k→∞) sup_(z∈D) |#phi#_k(z)| > 0 =>sup_(||z||=1) lim sup_(k→∞) |#phi#_k(z)| > 0 for every sequence (#phi#_k) is contained in E~★. It is studied how this implication can be quantified, for example if there exists a constant C > 0 such that lim sup_(k→∞) sup_(z∈D) |#phi#_k(z)| = 1 => sup_(||z||=1) lim sup_(k→∞)|#phi#_k(z)| ≥ C for every sequence (#phi#_k(z) is contained in E~★, is studied. Relatively compact sets and limited sets in l~∞ - among others the unit vectors - have uniform bounds in this sense. A fundamental example of a limited set without any uniform bounds is constructed. A set D is called bounding if f(D) is bounded for every entire function on E. That bounding sets are uniformly limited and that strongly bounding sets are limited in the strongest sense are proved. Examples show that the convex hull of bounding sets in general are not bounding and that bounding sets in general does not have Grothendieck's incapsulating property as relatively weakly compact sets have.
机译:如果lim sup_(k→∞)sup_(z∈D)|#phi#_k(z)|,则Banach空间E中的集合D是有限的。 > 0 => sup_(|| z || = 1)lim sup_(k→∞)|#phi#_k(z)|在E〜★中,每个序列(#phi#_k)> 0。研究了如何对这种影响进行量化,例如,如果存在一个常数C> 0,使得lim sup_(k→∞)sup_(z∈D)|#phi#_k(z)| = 1 => sup_(|| z || = 1)lim sup_(k→∞)|#phi#_k(z)|对每个序列≥C进行研究(E〜★中包含#phi#_k(z)。在这种意义上,l〜∞中的相对紧集和有限集(除其他单位矢量外)具有统一边界。一个基本示例证明如果没有对E上的每个函数进行f(D)约束,则将D称为边界,这证明了边界集是均匀受限的,并且在最强的意义上证明了强边界集是有限的实例显示,边界集的凸包通常不具有边界,并且边界集通常不具有相对弱的紧集具有Grothendieck的封装特性。

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