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On Self-Approaching and Increasing-Chord Drawings of 3-Connected Planar Graphs

机译:关于三连通平面图的自逼近和和弦图

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An st-path in a drawing of a graph is self-approaching if during a traversal of the corresponding curve from s to any point t′ on the curve the distance to t′ is non-increasing. A path has increasing chords if it is self-approaching in both directions. A drawing is self-approaching (increasing-chord) if any pair of vertices is connected by a self-approaching (increasing-chord) path. We study self-approaching and increasing-chord drawings of triangulations and 3-connected planar graphs. We show that in the Euclidean plane, triangulations admit increasing-chord drawings, and for planar 3-trees we can ensure planarity. Moreover, we give a binary cactus that does not admit a self-approaching drawing. Finally, we show that 3-connected planar graphs admit increasing-chord drawings in the hyperbolic plane and characterize the trees that admit such drawings.
机译:如果在从s到曲线上的任意点t'遍历相应曲线的过程中,到t'的距离不增加,则在图形图中的st路径是自逼近的。如果路径在两个方向上都是自逼近的,则其和弦会增加。如果通过自逼近(渐增弦)路径连接了任意一对顶点,则图形为自逼近(渐增弦)。我们研究三角剖分和三连接平面图的自逼近和和弦绘制。我们证明,在欧几里得平面中,三角剖分允许增加和弦图,对于平面三叉树,我们可以确保平面度。此外,我们给出了一个不接受自逼图形的二进制仙人掌。最后,我们显示了3个连通的平面图在双曲平面中允许渐增弦图,并刻画了允许此类图的树。

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