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