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arXiv 1709.02420math.GR
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相对双曲群在无穷远处具有半稳定基本群

Relatively Hyperbolic Groups have Semistabile Fundamental Group at Infinity

Michael L. Mihalik, Eric Swenson

摘要:

设$G$是一个单端有限生成群,它相对于P是双曲的,P是一个单端有限生成子群的集合.我们的主要定理是:如果边界$\partial (G, P)$没有割点,则$G$在$\infty$有半稳定的基本群.在$G$和P的成员上,在较弱的条件下,可以消除单端假设和无割点条件,得到相同的半稳定性结论.我们给出了一个例子,表明我们的主要结果是有点最优。最后改进了F. Dahmani和D.格罗夫斯

英文摘要:

Suppose $G$ is a 1-ended finitely generated group that is hyperbolic relative to P a finite collection of 1-ended finitely generated subgroups. Our main theorem states that if the boundary $\partial (G, P)$ has no cut point, then $G$ has semistable fundamental group at $\infty$. Under mild conditions on $G$ and the members of P the 1-ended hypotheses and the no cut point condition can be eliminated to obtain the same semistability conclusion. We give an example that shows our main result is somewhat optimal. Finally, we improve a "double dagge" result of F. Dahmani and D. Groves.

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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