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arXiv 1105.1297math.GR
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虚自由群的子群增长谱

The subgroup growth spectrum of virtually free groups

Jan-Christoph Schlage-Puchta

摘要:

对于一个有限生成群$Γ$,用$μ(Γ)$表示$Γ$的增长系数,即所有实数$d$上的下确界,使得$s_n(Γ)<n!^d$。证明了虚自由群的增长系数总是有理数,并且每个有理数都是某个虚自由群的增长系数。此外,我们描述了一个算法来计算$μ$。

英文摘要:

For a finitely generated group $Γ$ denote by $μ(Γ)$ the growth coefficient of $Γ$, that is, the infimum over all real numbers $d$ such that $s_n(Γ)<n!^d$. We show that the growth coefficient of a virtually free group is always rational, and that every rational number occurs as growth coefficient of some virtually free group. Moreover, we describe an algorithm to compute $μ$.

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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