上海大学学报(自然科学版) ›› 2009, Vol. 15 ›› Issue (1): 17-19.

• 数理化科学 • 上一篇    下一篇

关于超平行体两类椭球为球的条件

刘旭飞,汪卫,冷岗松   

  1. 上海大学 理学院,上海 200444
  • 出版日期:2009-02-21 发布日期:2009-02-21
  • 作者简介:冷岗松(1961~),男,教授,博士生导师,博士,研究方向为凸几何、几何分析.
  • 基金资助:
    国家自然科学基金资助项目(10671117)

Conditions for Two Types of Ellipsoids of Parallelotope Being Ball

  1. College of Sciences, Shanghai University, Shanghai 200444, China
  • Online:2009-02-21 Published:2009-02-21

摘要:

 在凸体中,John椭球和新椭球是两类重要的椭球.就超平行体的John椭球是球和超平行体的新椭球是球分别给出一个充分必要条件.

关键词: 超平行体;超立方体;John椭球;新椭球

Abstract:

John ellipsoid and new ellipsoid are two types of important ellipsoids in convex bodies. In this paper, a necessary and sufficient condition for each of the two types of ellipsoids of the parallelotope being a ball is given.

Key words: parallelotope; hypercube; John ellipsoid; new ellipsoid

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