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arXiv 2102.04239math.COmath.AGmath.GR
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关于图的自同构群在幺模群中的一种表示

On a representation of the automorphism group of a graph in a unimodular group

István Estelyi, Ján Karabáš, Alexander Mednykh, Roman Nedela

摘要:

研究了连通图$X$的自同构群在维数为$β$的幺模矩阵$U_β$群中的表示,其中$β$是图$X$的贝蒂数.我们对自同构群不嵌入到$U_β$中的图进行了分类。因此,如果$X$没有悬垂顶点,并且$X$不是简单的循环,则表示是忠实的,并且$\mathrm{Aut}\,X$忠实地作用于$H_1(X,\mathbb{Z})$。后者的声明可以被视为一个离散的模拟经典赫维茨定理黎曼曲面的一般大于一。

英文摘要:

We investigate a representation of the automorphism group of a connected graph $X$ in the group of unimodular matrices $U_β$ of dimension $β$, where $β$ is the Betti number of graph $X$. We classify the graphs for which the automorphism group does not embed into $U_β$. It follows that if $X$ has no pendant vertices and $X$ is not a simple cycle, then the representation is faithful and $\mathrm{Aut}\,X$ acts faithfully on $H_1(X,\mathbb{Z})$. The latter statement can be viewed as a discrete analogue of a classical Hurwitz's theorem on Riemann surfaces of genera greater than one.

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