Topological Graphs with No Large Grids

Topological Graphs with No Large Grids
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没有大网格的拓扑图

DOI:
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发表时间:
2005
期刊:
Graphs Comb.
影响因子:
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通讯作者:
G. Tóth
G. Tóth
中科院分区:
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文献类型:
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作者:
J. Pach;R. Pinchasi;M. Sharir;G. Tóth

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设G是一个有n个顶点的拓扑图,即,在平面上画的一种图,其边画成简单的乔丹曲线。证明了对任意常数k,l,存在另一个常数C(k,l),使得若G至少有C(k,l)n条边,则它包含k× l-格状构形,即它包含k+l条边,使得前k条边中的每一条与后l条边中的每一条相交.此外,可以要求前k条边入射到同一顶点。
Let G be a topological graph with n vertices, i.e., a graph drawn in the plane with edges drawn as simple Jordan curves. It is shown that, for any constants k,l, there exists another constant C(k,l), such that if G has at least C(k,l)n edges, then it contains a k×l-gridlike configuration, that is, it contains k+l edges such that each of the first k edges crosses each of the last l edges. Moreover, one can require the first k edges to be incident to the same vertex.