Planar Crossing Numbers of Graphs of Bounded Genus

Planar Crossing Numbers of Graphs of Bounded Genus
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有界亏格图的平面交叉数

DOI:
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发表时间:
2012
影响因子:
0.8
通讯作者:
I. Vrto
I. Vrto
中科院分区:
数学3区
文献类型:
--
作者:
H. Djidjev;I. Vrto

文献摘要

被引文献

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Pach和Tóth证明了任何亏格为g且最大度为d的n-顶点图的平面交叉数至多为cgdn,其中c>1。我们改进了这一结果,通过减少到O(dgn)的界限,也证明了我们的结果是紧在一个常数因子。我们的证明是建设性的,并产生一个算法的时间复杂度为O(dgn)。作为我们的主要结果的一个结果,我们显示了平面交叉数和表面交叉数之间的关系。
Pach and Tóth proved that any n-vertex graph of genus g and maximum degree d has a planar crossing number at most cgdn, for a constant c>1. We improve on this result by decreasing the bound to O(dgn), and also prove that our result is tight within a constant factor. Our proof is constructive and yields an algorithm with time complexity O(dgn). As a consequence of our main result, we show a relation between the planar crossing number and the surface crossing number.