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:
影响因子:
--
通讯作者:
Da Silva M
中科院分区:
文献类型:
--
作者:
Da Silva M
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.
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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:
Da Silva;Murilo Vicente Gonçalves
通讯作者:
Murilo Vicente Gonçalves
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
影响因子:
0.8
作者:
M. Farber
通讯作者:
M. Farber
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