Geodesic
A note on solvable vertex stabilizers of $s$-transitive graphs of prime valency
Czechoslovak Mathematical Journal, Tome 65 (2015) no. 3, pp. 781-785 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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A graph $X$, with a group $G$ of automorphisms of $X$, is said to be $(G,s)$-transitive, for some $s\geq 1$, if $G$ is transitive on $s$-arcs but not on $(s+1)$-arcs. Let $X$ be a connected $(G,s)$-transitive graph of prime valency $p\geq 5$, and $G_v$ the vertex stabilizer of a vertex $v\in V(X)$. Suppose that $G_v$ is solvable. Weiss (1974) proved that $|G_v|\mid p(p-1)^2$. In this paper, we prove that $G_v\cong (\mathbb Z_p\rtimes \mathbb Z_m)\times \mathbb Z_n$ for some positive integers $m$ and $n$ such that $n\div m$ and $m\mid p-1$.
A graph $X$, with a group $G$ of automorphisms of $X$, is said to be $(G,s)$-transitive, for some $s\geq 1$, if $G$ is transitive on $s$-arcs but not on $(s+1)$-arcs. Let $X$ be a connected $(G,s)$-transitive graph of prime valency $p\geq 5$, and $G_v$ the vertex stabilizer of a vertex $v\in V(X)$. Suppose that $G_v$ is solvable. Weiss (1974) proved that $|G_v|\mid p(p-1)^2$. In this paper, we prove that $G_v\cong (\mathbb Z_p\rtimes \mathbb Z_m)\times \mathbb Z_n$ for some positive integers $m$ and $n$ such that $n\div m$ and $m\mid p-1$.
DOI : 10.1007/s10587-015-0207-0
Classification : 05C25, 20B25
Keywords: symmetric graph; $s$-transitive graph; $(G, s)$-transitive graph 
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Guo, Song-Tao; Hou, Hailong; Xu, Yong. A note on solvable vertex stabilizers of $s$-transitive graphs of prime valency. Czechoslovak Mathematical Journal, Tome 65 (2015) no. 3, pp. 781-785. doi: 10.1007/s10587-015-0207-0

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