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arXiv 2211.13397math.GRmath.CO
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关于$k$-测地图与群

On $k$-geodetic graphs and groups

Murray Elder, Adam Piggott, Kane Townsend

AI总结:

本文研究$k$-测地图与群的关联,证明具有$k$-测地凯莱图的双曲群是几乎自由群且其中无限阶元素的中心化子为无限循环群,拓展了此前仅$k=1$时成立的结论,关键工具为关于$k$-测地图类梯结构的新图论结果。

摘要:

对于某个$k\geq1$,若图连通且任意两个顶点之间至多存在$k$条测地线,我们称其为$k$-测地图。本文证明,任何具有$k$-测地Cayley(凯莱)图的双曲群都是几乎自由群。此外,这类群中任意无限阶元素的中心化子都是无限循环群。这些结果此前仅在$k=1$的情形下已知。证明该定理的关键工具是一项新的图论结论,涉及$k$-测地图中的“类梯结构”。

英文摘要:

We call a graph $k$-geodetic, for some $k\geq 1$, if it is connected and between any two vertices there are at most $k$ geodesics. It is shown that any hyperbolic group with a $k$-geodetic Cayley graph is virtually-free. Furthermore, in such a group the centraliser of any infinite order element is an infinite cyclic group. These results were known previously only in the case that $k=1$. A key tool used to develop the theorem is a new graph theoretic result concerning ``ladder-like structures'' in a $k$-geodetic graph.

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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