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arXiv 1809.07445math.CO
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不含$4,9$ -圈和两个来自$\{5,6,7,8\}$的圈的可平面图的DP-3-染色

DP-3-coloring of planar graphs without $4,9$-cycles and two cycles from $\{5,6,7,8\}$

Runrun Liu, Sarah Loeb, Martin Rolek, Yuxue Yin, Gexin Yu

摘要:

列表着色的一个推广,现在称为DP着色,最近由Dvopelák和Postle引入。本质上,DP着色在邻顶点的颜色列表之间分配任意匹配,而不是像列表着色那样仅匹配相同的颜色。关于可平面图列表染色的一些结果已经被推广到DP染色的情形。我们注意到列表着色结果并不总是扩展到DP着色结果。本文的主要结果是证明了每个不含长为$\{4, a, b, 9\}$ for $a, b \in \{6, 7, 8\}$的圈的平面图都是DP-$3$-可着色的,推广了关于可平面图的$3$ -可选性的三个已有结果.

英文摘要:

A generalization of list-coloring, now known as DP-coloring, was recently introduced by Dvořák and Postle. Essentially, DP-coloring assigns an arbitrary matching between lists of colors at adjacent vertices, as opposed to only matching identical colors as is done for list-coloring. Several results on list-coloring of planar graphs have since been extended to the setting of DP-coloring. We note that list-coloring results do not always extend to DP-coloring results. Our main result in this paper is to prove that every planar graph without cycles of length $\{4, a, b, 9\}$ for $a, b \in \{6, 7, 8\}$ is DP-$3$-colorable, extending three existing results on $3$-choosability of planar 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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