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arXiv 2403.01075math.CO
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二距离传递二面体图的分类

The classification of two-distance transitive dihedrants

Jun-Jie Huang, Yan-Quan Feng, Jin-Xin Zhou, Fu-Gang Yin

AI总结:

本文分类阶为 2n 的二面体群上的连通 2-距离传递 Cayley 图,证明其要么为 2-弧传递图,要么同构于参数满足 mb=2n 的完全多部图 K_{m[b]}。

摘要:

若顶点传递图 Γ 对每个顶点 u,Γ 的固定顶点 u 的自同构群在与 u 距离为 1 和 2 的顶点集合上均传递作用,则称 Γ 为 2-距离传递的;若 Γ 的自同构群在 2-弧集合上传递,则称其为 2-弧传递的。因此,2-弧传递图也是 2-距离传递的。Du、Malnič 和 Marušič 已在 [Classification of 2-arc-transitive dihedrants, J. Combin. Theory Ser. B 98 (2008), 1349--1372] 中给出了二面体群上 2-弧传递 Cayley 图的分类。本文证明,阶为 2n 的二面体群上的连通 2-距离传递 Cayley 图,要么是 2-弧传递的,要么同构于完全多部图 K_{m[b]},其中 m≥3、b≥2 且 mb=2n。

英文摘要:

A vertex transitive graph $Γ$ is said to be $2$-distance transitive if for each vertex $u$, the group of automorphisms of $Γ$ fixing the vertex $u$ acts transitively on the set of vertices at distance $1$ and $2$ from $u$, while $Γ$ is said to be $2$-arc transitive if its automorphism group is transitive on the set of $2$-arcs. Then $2$-arc transitive graphs are $2$-distance transitive. The classification of $2$-arc transitive Cayley graphs on dihedral groups was given by Du, Malnič and Marušič in [Classification of 2-arc-transitive dihedrants, J. Combin. Theory Ser. B 98 (2008), 1349--1372]. In this paper, it is shown that a connected 2-distance transitive Cayley graph on the dihedral group of order $2n$ is either $2$-arc transitive, or isomorphic to the complete multipartite graph $K_{m[b]}$ for some $m\geq3$ and $b\geq2$ with $mb=2n$.

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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