次导数
数学
可微函数
希尔伯特空间
规范(哲学)
等价(形式语言)
赋范向量空间
弗雷歇导数
组合数学
闭集
数学分析
空格(标点符号)
正多边形
纯数学
巴拿赫空间
几何学
凸优化
政治学
法学
语言学
哲学
标识
DOI:10.1016/s0022-247x(03)00213-0
摘要
For a nonempty closed set C in a normed linear space X with uniformly Gâteaux differentiable norm, it is shown that the distance function dC is strictly differentiable at x∈X⧹C iff it is regular at x iff its modified upper or lower Dini subdifferential at x is a singleton iff its upper or lower Dini subdifferential at x is nonempty iff its upper or lower Dini derivative at x is subadditive. Moreover if X is a Hilbert space, then dC is Fréchet differentiable at x∈X⧹C iff its Fréchet subdifferential at x is nonempty. Many characteristics of proximally smooth sets and convex closed sets in a Hilbert space are also given.
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