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arXiv 1807.07372math.COcs.DM
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关于几类特殊的接触 $B_0$-VPG 图

On some special classes of contact $B_0$-VPG graphs

Flavia Bonomo-Braberman, María Pía Mazzoleni, Mariano Leonardo Rean, Bernard Ries

AI总结:

本文定义了接触 $B_0$-VPG 图,并在弦图、tree-cographs、$P_4$-tidy 图和 $P_5$-free 图四类特殊图中给出了其极小禁止导出子图刻画,同时提出了识别弦接触 $B_0$-VPG 图的多项式时间算法。

摘要:

若能为图 $G$ 的每个顶点关联一条矩形网格上的路径,使得两顶点相邻当且仅当对应路径在至少一个网格点相交,则图 $G$ 是 $B_0$-VPG 图。若图 $G$ 是 $B_0$-VPG 图且存在一种表示,其中任意两条路径不相交且不共享网格边,则它是接触 $B_0$-VPG 图。本文在弦图、tree-cographs、$P_4$-tidy 图和 $P_5$-free 图这四类特殊图中,给出了接触 $B_0$-VPG 图的极小禁止导出子图刻画。此外,我们提出了一种多项式时间算法来识别弦接触 $B_0$-VPG 图。

英文摘要:

A graph $G$ is a $B_0$-VPG graph if one can associate a path on a rectangular grid with each vertex such that two vertices are adjacent if and only if the corresponding paths intersect at at least one grid-point. A graph $G$ is a contact $B_0$-VPG graph if it is a $B_0$-VPG graph admitting a representation with no two paths crossing and no two paths sharing an edge of the grid. In this paper, we present a minimal forbidden induced subgraph characterisation of contact $B_0$-VPG graphs within four special graph classes: chordal graphs, tree-cographs, $P_4$-tidy graphs and $P_5$-free graphs. Moreover, we present a polynomial-time algorithm for recognising chordal contact $B_0$-VPG graphs.

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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