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可凹点和Banach空间的强光滑性和逼近紧性 被引量:2

Dentable Point and Strongly Smoothness and Approximative Compactness in Banach Spaces
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摘要 本文研究共轭空间X~*的逼近紧性.证明了条件(i),(ii),(iii)是等价的,这里(i)X~*单位球面上的范数可达点是单位球B(X~*)的w~*可凹点;(ii)X是强光滑空间;(iii)X~*的每个w~*闭凸集是逼近紧的Chebyshev集. In this paper,we investigate approximative compactness in X~*.We prove that(i),(ii) and(iii) are equivalent,where(i) if x~*∈S(X~*) is norm attainable on S(X),then x~* is a w~* dental point of B(X~*);(ii) X is a strongly smooth space;(iii) every weak~* closed convex set is an approximatively compact Chebyshev set.
出处 《数学学报(中文版)》 SCIE CSCD 北大核心 2010年第6期1217-1224,共8页 Acta Mathematica Sinica:Chinese Series
基金 黑龙江自然科学基金(A200902)
关键词 w~*可凹点 强光滑空间 逼近紧性 w~* dental point strongly smooth space approximative compactness
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