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arXiv 1302.2076math.MGmath.FA
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关于对称性测度与浮体

On measures of symmetry and floating bodies

Stanislaw J. Szarek

摘要:

我们考虑如下n维凸体K的对称性测度:$ρ(K)$是K中存在点x的最小常数,使得对于通过x的n-1维超平面划分K,两部分的体积之比至多为$ρ(K)$。众所周知,$ρ(K)=1$当且仅当K是对称的.我们建立了一个精确的上界$ρ(K)$,这恢复了1960年的结果Grunbaum。我们还提供了一个平等的情况下(有关最近的结果尼尔和Paffenholz复曲面品种)的表征,并将这些问题的概念凸浮体。

英文摘要:

We consider the following measure of symmetry of a convex n-dimensional body K: $ρ(K)$ is the smallest constant for which there is a point x in K such that for partitions of K by an n-1-dimensional hyperplane passing through x the ratio of the volumes of the two parts is at most $ρ(K)$. It is well known that $ρ(K)=1$ iff K is symmetric. We establish a precise upper bound on $ρ(K)$; this recovers a 1960 result of Grunbaum. We also provide a characterization of equality cases (relevant to recent results of Nill and Paffenholz about toric varieties) and relate these questions to the concept of convex floating bodies.

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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