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首页> 外文期刊>Graphs and Combinatorics >On the b-Coloring of Cographs and P4-Sparse Graphs
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On the b-Coloring of Cographs and P4-Sparse Graphs

机译:关于Cograph和P 4 -稀疏图的b-着色

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A b-coloring of a graph is a coloring such that every color class admits a vertex adjacent to at least one vertex receiving each of the colors not assigned to it. The b-chromatic number of a graph G, denoted by χ b (G), is the maximum number t such that G admits a b-coloring with t colors. A graph G is b-continuous if it admits a b-coloring with t colors, for every t = c(G), ¼, cb(G)t = chi(G), ldots, chi_b(G) . We define a graph G to be b-monotonic if χ b (H 1) ≥ χ b (H 2) for every induced subgraph H 1 of G, and every induced subgraph H 2 of H 1. In this work, we prove that P 4-sparse graphs (and, in particular, cographs) are b-continuous and b-monotonic. Besides, we describe a dynamic programming algorithm to compute the b-chromatic number in polynomial time within these graph classes.
机译:图的b着色是一种着色,以使每个颜色类别都允许一个顶点与至少一个顶点相邻,该顶点接收未分配给它的每种颜色。图G的b色数用χb(G)表示,是最大数t,因此G允许t色为b色。如果图G接受具有t种颜色的b色,则它是b连续的,对于每个t = c(G),¼,c b (G)t = chi(G),ldots, chi_b(G)。如果图χ b (H 1 )≥χ b (H 2 )对于G的每个诱导子图H 1 ,以及H 1 的每个诱导子图H 2 。在这项工作中,我们证明P 4 -稀疏图(尤其是cograph)是b连续和b单调的。此外,我们描述了一种动态规划算法来计算这些图类中多项式时间内的b色数。

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