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arXiv 2103.04455math.MG
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球凸集若干结果的新证明

New proofs for some results on spherically convex sets

Constantin Zălinescu

摘要:

在郭和彭的文章[球面凸集和球面凸函数,J.凸分析。28(2021),103- 122],在$\mathbb{R}^{n}$ $(n\ge2)$中定义了“一般曲面”上的球面凸集和函数的概念,研究了这些集合和函数类的几个性质,并且建立了球面凸集的Radon,Helly,Carathéodory和Minkowski定理的类似物,以及球面凸函数与通常的凸函数类似的一些性质。在获得这样的结果,作者使用的分析方法的基础上,他们的定义。本文的目的是为球面凸集的结果提供更简单的证明;我们的证明是基于$\mathbb{R}^{n}$中常用凸集对球面凸集的一些刻画/表示。

英文摘要:

In Guo and Peng's article [Spherically convex sets and spherically convex functions, J. Convex Anal. 28 (2021), 103--122], one defines the notions of spherical convex sets and functions on "general curved surfaces" in $\mathbb{R}^{n}$ $(n\ge2)$, one studies several properties of these classes of sets and functions, and one establishes analogues of Radon, Helly, Carathéodory and Minkowski theorems for spherical convex sets, as well as some properties of spherical convex functions which are analogous to those of usual convex functions. In obtaining such results, the authors use an analytic approach based on their definitions. Our aim in this note is to provide simpler proofs for the results on spherical convex sets; our proofs are based on some characterizations/representations of spherical convex sets by usual convex sets in $\mathbb{R}^{n}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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