数学物理学报

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凸体的宽度不等式及应用

袁淑峰; 柯睿; 冷岗松   

  1. 绍兴文理学院上虞分院数学系 上虞 312300
  • 收稿日期:2005-08-23 修回日期:2006-09-30 出版日期:2007-08-25 发布日期:2007-08-25
  • 通讯作者: 袁淑峰
  • 基金资助:
    国家自然科学基金(10671117)资助

Inequalities for Widths of Convex Bodies with Applications

Yuan Shufeng; Ke Rui; Leng Gangsong   

  1. Department of Mathematics, Shangyu College Shaoxing University, Shaoxing 312300
  • Received:2005-08-23 Revised:2006-09-30 Online:2007-08-25 Published:2007-08-25
  • Contact: Yuan Shufeng

摘要: 该文建立了关于单形宽度的杨路、张景中不等式的一个逆不等式. 作为凸体宽度不等式的应用,得到了凸体的截面和投影的一些估计式.

关键词: 凸体, 宽度, 单形, 体积

Abstract: In this paper the authors establish the following inverse inequality of Yang-Zhang's inequality for the width of a simplex: Let Ω be an n-dimensional simplex with volume Voln(\Omega)$,width w(Ω), and facet areas S1,S2,,Sn+1 respectively, then
w(Ω)rnVoln(Ω)max1in+1(Si),


where
γn={\disp2nn+1,for odd  n;2,for even  n.

As applications, the authors show some inequalities for orthogonal projections and sections of convex bodies.

Key words: Convex body, Width, Simplex, Volume

中图分类号: 

  • 52A40