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arXiv 2608.19780math.CO

实根流多项式仅有整数根

Real-rooted flow polynomials have only integral roots

发表机构厦门大学 · 南洋理工大学国立教育学院
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  • Xiamen University(厦门大学)
  • National Institute of Education, Nanyang Technological University(南洋理工大学国立教育学院)

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Meiqiao Zhang, Fengming Dong

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中文总结 AI 辅助

本文证明任意无桥图$G$的流多项式$F(G,x)$若仅含实零点,则$G$是弦平面图的对偶图,且其零点均为1、2、3中的整数。

中文摘要 AI 辅助

本文证明,对任意无桥图$G$,若其流多项式$F(G,x)$仅含实零点,则$G$是弦平面图的对偶图,且$F(G,x)$的每个零点均为集合$\{1,2,3\text{}$中的整数。

英文摘要

Let $G$ be a connected bridgeless graph. In 2011, Kung and Royle showed that all roots of the flow polynomial $F(G,λ)$ of $G$ are integers if and only if $G$ is the dual of a chordal plane graph. In this article, we further prove that if $F(G,λ)$ has real roots only, then $G$ is the dual of a chordal plane graph and each root of $F(G,λ)$ is an integer in the set $\{1,2,3\}$.

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