Decomposition of even-hole-free graphs with star cutsets and 2-joins

Decomposition of even-hole-free graphs with star cutsets and 2-joins
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具有星割集和 2-连接的偶孔无图分解

DOI:
10.1016/j.jctb.2012.10.001
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发表时间:
2013
期刊:
Journal of Combinatorial Theory, Series B
影响因子:
--
通讯作者:
Da Silva M
Da Silva M
中科院分区:
--
文献类型:
--
作者:
Da Silva M

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在本文中,我们考虑通过排除偶数孔(即偶数长度的无弦循环)作为诱导子图而定义的简单图类。这些图被称为无偶孔图。我们证明了偶无洞图的分解定理,该定理使用星割集和 2-连接。这是对 Conforti、Cornuéjols、Kapoor 和 Vušković 提出的唯一其他先前已知的无偶孔图分解的显着强化,该分解使用 2-连接和星形、双星形和三星形割集。它也类似于 Chudnovsky、Robertson、Seymour 和 Thomas 用斜割集、2-连接及其补集对 Berge(即完美)图进行分解。无偶孔图和 Berge 图之间的相似性高于无偶孔图和简单的无奇孔图之间的相似性,因为排除 4 孔会自动排除长度至少为 6 的所有反孔。在不包含 4 孔的图中,斜割集简化为星割集,补集中的 2-连接意味着星割集,因此在某种程度上,期望无偶孔图可以仅用星割集和 2-连接来分解。该分解定理的结果是偶数无洞图的识别算法,该算法比以前已知的算法要快得多。
In this paper we consider the class of simple graphs defined by excluding, as induced subgraphs, even holes (i.e. chordless cycles of even length). These graphs are known as even-hole-free graphs. We prove a decomposition theorem for even-hole-free graphs, that uses star cutsets and 2-joins. This is a significant strengthening of the only other previously known decomposition of even-hole-free graphs, by Conforti, Cornuéjols, Kapoor and Vušković, that uses 2-joins and star, double star and triple star cutsets. It is also analogous to the decomposition of Berge (i.e. perfect) graphs with skew cutsets, 2-joins and their complements, by Chudnovsky, Robertson, Seymour and Thomas. The similarity between even-hole-free graphs and Berge graphs is higher than the similarity between even-hole-free graphs and simply odd-hole-free graphs, since excluding a 4-hole, automatically excludes all antiholes of length at least 6. In a graph that does not contain a 4-hole, a skew cutset reduces to a star cutset, and a 2-join in the complement implies a star cutset, so in a way it was expected that even-hole-free graphs can be decomposed with just the star cutsets and 2-joins. A consequence of this decomposition theorem is a recognition algorithm for even-hole-free graphs that is significantly faster than the previously known ones.
平衡0-1矩阵一、分解
DOI: --
发表时间: 2001
期刊: J. Comb. Theory B
影响因子: --
作者:
M. Conforti;Gérard Cornuéjols;Ajai Kapoor;Kristina Vuskovic
通讯作者: Kristina Vuskovic
DOI: --
发表时间: 2008
期刊:
影响因子: --
作者:
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为没有平衡倾斜分区的完美图形着色
DOI: 10.48550/arxiv.1308.6444
发表时间: 2013
期刊: --
影响因子: --
作者:
Chudnovsky M
通讯作者: Chudnovsky M
关于桥接图的直径和半径
DOI: --
发表时间: 1989
影响因子: 0.8
作者:
M. Farber
通讯作者: M. Farber
贝塔完美图
DOI: --
发表时间: 1996
期刊: J. Comb. Theory B
影响因子: --
作者:
S. Markossian;G. Gasparian;B. Reed
通讯作者: B. Reed