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arXiv 0909.0379math.MGmath.DG
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紧群的极表示及其轨道的凸包

Polar representations of compact groups and convex hulls of their orbits

V. Gichev

摘要:

本文给出了紧群$G\subseteq\GL(V)$的一个刻划,其中$V$是一个有限维实向量空间,它具有以下性质\SP{}:$G$ -轨道的凸包族是关于Minkowski加法的半群.如果$G$是有限的,则\SP{}成立当且仅当$G$是Coxeter群;如果$G$是连通的,则\SP{}为真当且仅当$G$是极群。一般地,$G$满足\SP{}当且仅当它是极性的并且它的外尔群是Coxeter群。

英文摘要:

The paper contains a characterization of compact groups $G\subseteq\GL(V)$, where $V$ is a finite dimensional real vector space, which have the following property \SP{}: the family of convex hulls of $G$-orbits is a semigroup with respect to the Minkowski addition. If $G$ is finite, then \SP{} holds if and only if $G$ is a Coxeter group; if $G$ is connected then \SP{} is true if and only if $G$ is polar. In general, $G$ satisfies \SP{} if and only if it is polar and its Weyl group is a Coxeter group.

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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