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On Contact Representations of Directed Planar Graphs

机译:关于有向平面图的接触表示

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Prior work on contact representations of planar graphs deals with undirected graphs only. We introduce a notion of point-side contact representations for directed planar graphs. We show every outerplanar digraph of out-degree at most three to enjoy a point-side triangle contact representation. The result is generalized to outerplanar digraphs of out-degree at most n, which are shown to have convex n-gon (i.e., 71-sided polygon) point-side contact representations. Our result is tight is the sense that there exists a 2-outerplanar digraph that does not have a point-side triangle contact representation. For maximal outerplanar digraphs of out-degree at most three, an efficient constructive procedure is designed to yield their point-side triangle contact representations. For general planar digraphs of degree d, they are shown to admit 2d-gon point-side contact representations.
机译:平面图的接触表示的先前工作仅处理无向图。我们引入了有向平面图的点侧接触表示的概念。我们显示出每个度数最多为3的外平面图,以享受点侧三角形接触表示。结果被推广到最大为n的外平面图,该图被显示为具有凸n边(即71边的多边形)的点侧接触表示。我们的结果是紧紧的,因为感觉到存在2个平面外的有向图,但没有点侧三角形接触表示。对于最大三度以上的最大外平面图,设计了一种有效的构造方法来生成其点侧三角形接触表示。对于度数为d的一般平面有向图,它们显示为允许2d角点侧接触表示。

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