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arXiv 1503.06920math.CO
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酉图

Unitary graphs

Sanming Zhou

摘要:

酉图是弧传递图,其顶点是厄米酉的标志,其边由基础有限域的某些元素定义。他们在最近的一类弧传递图的分类中发挥了重要作用,这些图允许自同构群在顶点上直接起作用。本文证明了所有酉图都是直径为2围长为3的连通图。在此基础上,对任意素数幂$q > 2$,得到了度为$Δ= q(q^2-1)$,直径为2的弧传递图的最大顶点数的阶$O(Δ^{5/3})$的下界.

英文摘要:

Unitary graphs are arc-transitive graphs with vertices the flags of Hermitian unitals and edges defined by certain elements of the underlying finite fields. They played a significant role in a recent classification of a class of arc-transitive graphs that admit an automorphism group acting imprimitively on the vertices. In this paper we prove that all unitary graphs are connected of diameter two and girth three. Based on this we obtain, for any prime power $q > 2$, a lower bound of order $O(Δ^{5/3})$ on the maximum number of vertices in an arc-transitive graph of degree $Δ= q(q^2-1)$ and diameter two.

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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