A list analogue of equitable coloring

A list analogue of equitable coloring
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DOI:
10.1002/jgt.v44:3
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发表时间:
2003-11
影响因子:
0.9
通讯作者:
A. Kostochka;M. Pelsmajer;D. West
A. Kostochka;M. Pelsmajer;D. West
中科院分区:
数学3区
文献类型:
--
作者:
A. Kostochka;M. Pelsmajer;D. West

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给定给定图G的顶点的可用颜色列表,列表着色是G的一种真着色,使得每个顶点上的颜色都是从它的列表中选择的。如果列表的大小都是k,则列表着色是公平的,如果每个颜色最多出现在$\lceil n(G)/k \rceil$顶点上。一个图是公平k-可选的,如果这样的着色存在,只要列表都有大小k。本文证明了当$k \ge {\Delta(G),n(G)/2}$时G是公平k-可选的,除非G包含$K_{k+1}$或k是奇数且$G=K_{k,k}$.对于森林,阈值提高到$k \ge 1+\Delta(G)/2$。如果G是2-退化图(给定k ≥ 5)或连通区间图(不包括$K_{k+1}$),则G是公平k-可选的,当$k\ge \Delta(G)$。© 2003 Wiley Periodicals,Inc. J Graph Theory 44:166-177,2003
Given lists of available colors assigned to the vertices of a graph G, a list coloring is a proper coloring of G such that the color on each vertex is chosen from its list. If the lists all have size k, then a list coloring is equitable if each color appears on at most $\lceil n (G)/k \rceil$ vertices. A graph is equitably k‐choosable if such a coloring exists whenever the lists all have size k. We prove that G is equitably k‐choosable when $k \ge {\rm max} \{ {\Delta (G),n(G)/2}\}$ unless G contains $K_{k+1}$ or k is odd and $G=K_{k,k}$. For forests, the threshold improves to $k \ge 1+\Delta (G)/2$. If G is a 2‐degenerate graph (given k ≥ 5) or a connected interval graph (other than $K_{k+1}$), then G is equitably k‐choosable when $k\ge \Delta(G)$. © 2003 Wiley Periodicals, Inc. J Graph Theory 44: 166–177, 2003