V2EX locally convex

Locally Convex

定义 Definition

“Locally convex”常指局部凸:在某个空间中(尤其是拓扑向量空间/函数分析里),每个点附近都能找到一个“凸”的邻域(直观理解:在这小块范围内,任取两点,它们之间的线段也仍留在这块范围内)。在几何中也可指曲线/曲面在局部呈凸的性质。

发音 Pronunciation (IPA)

/lokli knvks/

例句 Examples

A locally convex shape has no inward dents in small regions.
局部凸的形状在小范围内没有向内凹进去的“凹陷”。

In functional analysis, many important spaces are studied as locally convex topological vector spaces.
在泛函分析中,许多重要的空间会被作为局部凸的拓扑向量空间来研究。

词源 Etymology

“Locally”来自 local(局部的)+ 副词后缀 -ly(表示“以……方式”);“convex”来自拉丁语 convexus,意为“拱起的、向外弯的”。合起来强调“在局部范围内具有凸性”。

相关词 Related Words

文学与著作 Literary Works

  • Rudin, Functional Analysis(讨论局部凸拓扑向量空间与半范数族)
  • Conway, A Course in Functional Analysis(涉及局部凸空间的基本框架)
  • Trèves, Topological Vector Spaces, Distributions and Kernels(系统使用“locally convex”作为核心概念)
  • Bourbaki, Topological Vector Spaces(以公理化方式展开局部凸空间理论)
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