Branchwidth of graphic matroids

Branchwidth of graphic matroids
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图形拟阵的分支宽度

DOI:
10.1017/cbo9780511666209.010
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发表时间:
2007
期刊:
--
影响因子:
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通讯作者:
Stéphan Thomassé
Stéphan Thomassé
中科院分区:
--
文献类型:
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作者:
Frédéric Mazoit;Stéphan Thomassé

文献摘要

被引文献

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讨论了Geelen,Gerards,Robertson和Whittle的一个问题,证明了无桥图的分支宽度等于其圈拟阵的分支宽度.我们的证明是基于超图的分支分解。利用拟阵对偶,这个结果的一个直接推论是:无桥平面图的分支宽度等于其平面对偶的分支宽度。这个结果是西摩和托马斯的一个结果的直接推论。
Answering a question of Geelen, Gerards, Robertson and Whittle, we prove that the branchwidth of a bridgeless graph is equal to the branchwidth of its cycle matroid. Our proof is based on branch-decompositions of hypergraphs. By matroid duality, a direct corollary of this result is that the branchwidth of a bridgeless planar graph is equal to the branchwidth of its planar dual. This consequence was a direct corollary of a result by Seymour and Thomas.