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arXiv 1402.2135math.COcs.DM
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具有和不具有幂有界团宽的图类

Graph classes with and without powers of bounded clique-width

Flavia Bonomo, Luciano N. Grippo, Martin Milanič, Martín D. Safe

AI总结:

本文研究幂有界团宽图类,给出了该性质的充要条件,并在由单个或两个连通禁止导出子图定义的图类中刻画了其特征,同时证明了对于任意正整数 $k$ 存在仅在 $k$ 次幂下有界团宽的图类。

摘要:

我们发起了对幂有界团宽图类的研究,即存在整数 $k$ 和 $\ell$ 使得图的 $k$ 次幂的团宽至多为 $\ell$ 的图类。我们给出了该性质的充分和必要条件。作为我们的主要结果,我们在由单个禁止导出子图或两个连通禁止导出子图定义的图类中,刻画了幂有界团宽的图类。我们还证明,对于每个正整数 $k$,都存在一个图类,使得该类中图的 $k$ 次幂构成有界团宽的图类,而对于任何更小的幂则不成立。

英文摘要:

We initiate the study of graph classes of power-bounded clique-width, that is, graph classes for which there exist integers $k$ and $\ell$ such that the $k$-th powers of the graphs are of clique-width at most $\ell$. We give sufficient and necessary conditions for this property. As our main results, we characterize graph classes of power-bounded clique-width within classes defined by either one forbidden induced subgraph, or by two connected forbidden induced subgraphs. We also show that for every positive integer $k$, there exists a graph class such that the $k$-th powers of graphs in the class form a class of bounded clique-width, while this is not the case for any smaller power.

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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