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arXiv math/0603670math.GR
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关于不可约无限非仿射Coxeter群

On Irreducible, Infinite, Non-affine Coxeter Groups

Dongwen Qi

摘要:

证明了如下结果:不可约无限非仿射Coxeter群的任何有限指标子群的中心是平凡的;不可约无限非仿射Coxeter群的任何有限指标子群不能表示为两个非平凡子群的乘积。这两个定理隐含了一类Coxeter群的唯一分解定理。我们还得到了不可约无限非仿射Coxeter群中除单位元外的每个元素在共轭作用下的轨道是一个无限集。这意味着一个不可约的无限Coxeter群是仿射的当且仅当它包含一个有限指数的阿贝尔子群。

英文摘要:

The following results are proved: The center of any finite index subgroup of an irreducible, infinite, non-affine Coxeter group is trivial; Any finite index subgroup of an irreducible, infinite, non-affine Coxeter group cannot be expressed as a product of two nontrivial subgroups. These two theorems imply a unique decomposition theorem for a class of Coxeter groups. We also obtain that the orbit of each element other than the identity under the conjugation action in an irreducible, infinite, non-affine Coxeter group is an infinite set. This implies that an irreducible, infinite Coxeter group is affine if and only if it contains an abelian subgroup of finite index.

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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