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arXiv 0910.4103math.MGmath.CO
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关于余紧双曲Coxeter群的增长性

On the growth of cocompact hyperbolic Coxeter groups

Ruth Kellerhals, Genevieve Perren

摘要:

对于具有有限生成元集S和完全增长函数P(x)/Q(x)的任意余紧双曲Coxeter群G,我们给出了分母多项式Q(x)的系数的一个递推公式,它允许根据Coxeter子群结构递归地确定G的Taylor系数和增长函数的极点行为.我们说明了这一点,在简单的情况下,紧凑的直角双曲n-多面体。最后,我们提供了详细的了解考克斯特群的情况下,最多6个发电机,双曲4-空间上的cocompanies,考虑三个combinatorially不同的家庭发现和分类的Lanner,Kaplinskaya和Esselmann,分别。

英文摘要:

For an arbitrary cocompact hyperbolic Coxeter group G with finite generator set S and complete growth function P(x)/Q(x), we provide a recursion formula for the coefficients of the denominator polynomial Q(x) which allows to determine recursively the Taylor coefficients and the pole behavior of the growth function of G in terms of its Coxeter subgroup structure. We illustrate this in the easy case of compact right-angled hyperbolic n-polytopes. Finally, we provide detailed insight into the case of Coxeter groups with at most 6 generators, acting cocompactly on hyperbolic 4-space, by considering the three combinatorially different families discovered and classified by Lanner, Kaplinskaya and Esselmann, respectively.

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