Ohba's conjecture is true for graphs with independence number at most three

Ohba's conjecture is true for graphs with independence number at most three
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大场猜想对于独立数最多为 3 的图成立

DOI:
10.1016/j.aml.2009.01.001
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发表时间:
2009-06
影响因子:
3.7
通讯作者:
Yufa shen
Yufa shen
中科院分区:
数学2区
文献类型:
--
作者:
Yanpo Li;GuopingZheng;Wenjie He;Yufa shen

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如果一个图G的选择数等于它的色数,则称它是色可选的。Ohba猜想,每个有2个χ(G)+1个或更少顶点的图G是色可选的。目前,只有几类特殊的图被证明,Ohba猜想是正确的。2004年,Ohba证明了如果|V(G)|≤2χ(G)且G的独立数至多为3,则G是色可选的(Ars Combinatoria,72(2004),133-139)。证明了如果|V(G)|≤2χ(G)+1且G的独立数至多为3,则G是色可选的。这证明了Ohba猜想对所有独立数不超过3的图G和G的所有χ(G)-色子图都成立。
A graph G is said to be chromatic-choosable if its choice number is equal to its chromatic number. Ohba has conjectured that every graph G with 2χ(G)+1 or fewer vertices is chromatic-choosable. At present, only several special classes of graphs have been verified, for which Ohba’s conjecture is true. In 2004, Ohba proved that if |V(G)|≤2χ(G) and the independence number of G is at most 3, then G is chromatic-choosable (Ars Combinatoria, 72 (2004), 133–139). In this work we show that if |V(G)|≤2χ(G)+1 and the independence number of G is at most 3, then G is chromatic-choosable. This proves that Ohba’s conjecture is true for all graphs G with independence number at most 3 and all χ(G)-chromatic subgraphs of G.
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发表时间: 2008
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