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On the Grundy number of graphs with few ~(P 4)'s

机译:关于极少〜(P 4)的图的Grundy数

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摘要

The Grundy number of a graph G is the largest number of colors used by any execution of the greedy algorithm to color G.The problem of determining the Grundy number of G is polynomial if G is a ~(P4)-free graph and NP-hard if G is a ~(P5)-free graph.In this article, we define a new class of graphs, the fat-extended P4-laden graphs, and we show a polynomial time algorithm to determine the Grundy number of any graph in this class.Our class intersects the class of ~(P5)-free graphs and strictly contains the class of ~(P4)-free graphs.More precisely, our result implies that the Grundy number can be computed in polynomial time for any graph of the following classes: ~(P4)-reducible, extended ~(P4)-reducible, ~(P4)-sparse, extended ~(P4)-sparse, ~(P4)-extendible, ~(P4)-lite, ~(P4)-tidy, ~(P4)-laden and extended ~(P4)-laden, which are all strictly contained in the fat-extended ~(P4)-laden class.
机译:图G的Grundy数是任何执行贪婪算法为G着色所使用的最大颜色数。如果G是无〜(P4)图且NP-,则确定G的Grundy数的问题是多项式。如果G是不含〜(P5)的图,则很难。在本文中,我们定义了一类新的图,即脂肪扩展的P4负载图,并且我们展示了多项式时间算法来确定图中任何图的Grundy数。我们的类与〜(P5)-无图的图类相交,并且严格包含〜(P4)-无图的图类。更准确地说,我们的结果表明可以对多项式的任意图在多项式时间内计算Grundy数。下列类别:〜(P4)可归约,扩展〜(P4)可归约,〜(P4)-稀疏,扩展〜(P4)-稀疏,〜(P4)-可扩展,〜(P4)-lite,〜( P4)-整洁,〜(P4)-负载和扩展〜(P4)-负载,它们都严格包含在脂肪扩展的〜(P4)-负载类中。

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