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Planar Graphs as VPG-Graphs

机译:平面图作为VPG图

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A graph is B_k-VPG when it has an intersection representation by paths in a rectangular grid with at most k bends (turns). It is known that all planar graphs are B_3-VPG and this was conjectured to be tight. We disprove this conjecture by showing that all planar graphs are B_2-VPG. We also show that the 4-connected planar graphs are a subclass of the intersection graphs of Z-shapes (i.e., a special case of B_2-VPG). Additionally, we demonstrate that a B_2-VPG representation of a planar graph can be constructed in O(n~(3/2)) time. We further show that the triangle-free planar graphs are contact graphs of: L-shapes, Γ-shapes, vertical segments, and horizontal segments (i.e., a special case of contact B_1-VPG). From this proof we gain a new proof that bipartite planar graphs are a subclass of 2-DIR.
机译:当一个图形具有B_k-VPG的交集时,该图形通过矩形网格中的路径具有最多k个折弯(转)的交点表示。众所周知,所有平面图都是B_3-VPG,并且推测这是紧密的。我们通过证明所有平面图都是B_2-VPG来反驳这个猜想。我们还表明,4个连接的平面图是Z形相交图的子类(即B_2-VPG的特例)。此外,我们证明可以在O(n〜(3/2))时间内构造平面图的B_2-VPG表示。我们进一步表明,无三角形平面图是以下形状的接触图:L形,Γ形,垂直段和水平段(即接触B_1-VPG的特殊情况)。从该证明中,我们获得了一个新的证明,即二分平面图是2-DIR的子类。

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