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arXiv 1602.08148math.CO
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关于unit disk图的禁止诱导子图

On forbidden induced subgraphs for unit disk graphs

Aistis Atminas, Viktor Zamaraev

摘要:

单位圆盘图是平面内等半径圆盘的交图。单位圆盘图的类是遗传的,因此允许用最小禁止诱导子图来刻画。尽管单位圆盘图的研究相当活跃,但对这类图的最小禁止诱导子图知之甚少。在文献中我们只发现了200多个极小非单位圆盘图。本文系统地研究了单位圆盘图类的禁止诱导子图。我们开发了一些结构和几何工具,并使用它们来揭示无穷多个新的极小非单位圆盘图。进一步,我们利用这些结果来研究共二部单位圆盘图的结构。特别地,我们给出了部分之间的边构成C4-free二部图的共二部单位圆盘图的结构特征,并证明了这些图的二部补图也是单位圆盘图.我们的研究结果使我们提出了一个猜想,即共同二部单位圆盘图类在二部补下是封闭的。

英文摘要:

A unit disk graph is the intersection graph of disks of equal radii in the plane. The class of unit disk graphs is hereditary, and therefore admits a characterization in terms of minimal forbidden induced subgraphs. In spite of quite active study of unit disk graphs very little is known about minimal forbidden induced subgraphs for this class. We found only finitely many minimal non unit disk graphs in the literature. In this paper we study in a systematic way forbidden induced subgraphs for the class of unit disk graphs. We develop several structural and geometrical tools, and use them to reveal infinitely many new minimal non unit disk graphs. Further we use these results to investigate structure of co-bipartite unit disk graphs. In particular, we give structural characterization of those co-bipartite unit disk graphs whose edges between parts form a C4-free bipartite graph, and show that bipartite complements of these graphs are also unit disk graphs. Our results lead us to propose a conjecture that the class of co-bipartite unit disk graphs is closed under bipartite complementation.

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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