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arXiv 1609.05348math.CO
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对称群上一类三次Cayley图的自同构群

Automorphism groups of a class of cubic Cayley graphs on symmetric groups

Xueyi Huang, Qiongxiang Huang, Lu Lu

摘要:

令$S_n$表示次数为$n$且具有$n\geq 3$的对称群。设置$S=\{c_n=(1\ 2\ldots \ n),c_n^{-1},(1\ 2)\}$。设$Γ_n=\mathrm{Cay}(S_n,S)$是$S_n$上关于$S$的Cayley图.本文证明了$Γ_n$($n\geq 13$)是正规Cayley图,并且$Γ_n$的全自同构群等于$\mathrm{Aut}(Γ_n)=R(S_n)\rtimes \langle\mathrm{Inn}(ϕ)\rangle\cong S_n\rtimes \mathbb{Z}_2$,其中$R(S_n)$是$S_n$的右正则表示,$ϕ=(1\ 2)(3\ n)(4\ n-1)(5\ n-2)\cdots$ $(\in S_n)$,$\mathrm{Inn}(ϕ)$是由$ϕ$诱导的$S_n$的内同构.

英文摘要:

Let $S_n$ denote the symmetric group of degree $n$ with $n\geq 3$. Set $S=\{c_n=(1\ 2\ldots \ n),c_n^{-1},(1\ 2)\}$. Let $Γ_n=\mathrm{Cay}(S_n,S)$ be the Cayley graph on $S_n$ with respect to $S$. In this paper, we show that $Γ_n$ ($n\geq 13$) is a normal Cayley graph, and that the full automorphism group of $Γ_n$ is equal to $\mathrm{Aut}(Γ_n)=R(S_n)\rtimes \langle\mathrm{Inn}(ϕ)\rangle\cong S_n\rtimes \mathbb{Z}_2$, where $R(S_n)$ is the right regular representation of $S_n$, $ϕ=(1\ 2)(3\ n)(4\ n-1)(5\ n-2)\cdots$ $(\in S_n)$, and $\mathrm{Inn}(ϕ)$ is the inner isomorphism of $S_n$ induced by $ϕ$.

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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