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arXiv 2201.05133math.CO
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稀疏图的列表重着色

List-Recoloring of Sparse Graphs

Daniel W. Cranston

摘要:

修复图形$G$、$G$的列表分配$L$和$L$ -着色$α$和$β$。一个$L$ -着色序列,从$α$开始,在每一步都是一个顶点的着色,所以每个中间着色都是一个真的$L$ -着色。如果$L$ -赋色序列的初始着色是$α$且其最终着色是$β$,则该序列将$α$转换为$β$。本文证明了存在一个$L$ -邻接序列,它能将$α$变换为$β$,并对每个顶点至多邻接一个常数次,如果(i)$G$是无三角形的平面的且$L$是7-赋值,或(ii)$\mathrm{mad}(G)<17/5$且$L$是6-赋值,或(iii)$\mathrm{mad}(G)<22/9$且$L$是4-赋值.第(一)和(二)部分确认了Dvokiák和Feghali的证词。

英文摘要:

Fix a graph $G$, a list-assignment $L$ for $G$, and $L$-colorings $α$ and $β$. An $L$-recoloring sequence, starting from $α$, recolors a single vertex at each step, so that each resulting intermediate coloring is a proper $L$-coloring. An $L$-recoloring sequence transforms $α$ to $β$ if its initial coloring is $α$ and its final coloring is $β$. We prove there exists an $L$-recoloring sequence that transforms $α$ to $β$ and recolors each vertex at most a constant number of times if (i) $G$ is triangle-free and planar and $L$ is a 7-assignment, or (ii) $\mathrm{mad}(G)<17/5$ and $L$ is a 6-assignment or (iii) $\mathrm{mad}(G)<22/9$ and $L$ is a 4-assignment. Parts (i) and (ii) confirm conjectures of Dvořák and Feghali.

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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