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arXiv 0908.0181math.CO
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流多项式只有整根的图

Graphs whose flow polynomials have only integral roots

Joseph P. S. Kung, Gordon F. Royle

摘要:

证明了如果无桥图G的流多项式只有整根,则G是平面弦图的对偶图。我们还证明了对于3连通三次图,在只有实流根的较弱假设下,同样的结论也成立。用拟阵理论的语言来表达,这个结果表明,只有整数特征根的上图拟阵是平面弦图的圈拟阵。

英文摘要:

We show if the flow polynomial of a bridgeless graph G has only integral roots, then G is the dual graph to a planar chordal graph. We also show that for 3-connected cubic graphs, the same conclusion holds under the weaker hypothesis that it has only real flow roots. Expressed in the language of matroid theory, this result says that the cographic matroids with only integral characteristic roots are the cycle matroids of planar chordal graphs.

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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