程立新.关于Banach空间光滑性的两点注记[J].数学研究及应用,1989,9(2):315~316
关于Banach空间光滑性的两点注记
Some Notes on Smoothness of Banach Spaces
投稿时间:1987-03-30  
DOI:10.3770/j.issn:1000-341X.1989.02.031
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程立新 江汉石油学院 
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英文摘要:
      In this paper, We show that a real or complex Banach space is smooth at x0(∈S(X)) iff, for any y∈S(X).(?)where Xx0,y= span {x0, y} . For a real Banach space X, we obtain that X is F-differentia ble at x0(∈S(X)) iff (?) Remark. The sufficient conditions of the conclusion have been proved by Yu Xintai [2].
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