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arXiv 1709.01258math.GR
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相对双曲特殊群的代数刻划

Algebraic characterisation of relatively hyperbolic special groups

Anthony Genevois

摘要:

这篇文章致力于刻画Haglund和Wise的特殊群的相对双曲性。更确切地说,我们引入了一种新的组合形式主义来研究(虚拟)特殊群,我们证明了,给定一个上紧特殊群$G$和一个有限子群集合$\mathcal{H}$,则$G$相对于$\mathcal{H}$是双曲的当且仅当(i)$\mathcal{H}$的每个子群是凸-上紧的,(ii)$\mathcal{H}$是几乎反常的集合,(iii)$G$的每个非虚循环阿贝尔子群包含在$\mathcal{H}$的某个群的共轭中.作为应用,我们证明了一个虚余紧特殊群是相对于交换子群的双曲群当且仅当它不包含$\mathbb{F}_2 \times \mathbb{Z}$。

英文摘要:

This article is dedicated to the characterisation of the relative hyperbolicity of Haglund and Wise's special groups. More precise, we introduce a new combinatorial formalism to study (virtually) special groups, and we prove that, given a cocompact special group $G$ and a finite collection of subgroups $\mathcal{H}$, then $G$ is hyperbolic relative to $\mathcal{H}$ if and only if (i) each subgroup of $\mathcal{H}$ is convex-cocompact, (ii) $\mathcal{H}$ is an almost malnormal collection, and (iii) every non-virtually cyclic abelian subgroup of $G$ is contained in a conjugate of some group of $\mathcal{H}$. As an application, we show that a virtually cocompact special group is hyperbolic relative to abelian subgroups if and only if it does not contain $\mathbb{F}_2 \times \mathbb{Z}$.

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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