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arXiv 0910.2469math.CO
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临界嵌入图的最大顶点数

On the Maximum Number of Vertices of Critically Embedded Graphs

Yashar Memarian

摘要:

定义一个图的边界点,该点嵌入在欧几里德平面中,且该点仅与一条边关联。本文研究嵌入在欧氏平面上的具有有限个边界点的图。我们对它们施加的简单几何条件是,从每个非边界顶点延伸的边的单位向量之和将等于零。我们称这样的图为临界图,并要求在给定的边界大小下,最大化临界图的顶点数。本文的主要结果给出了平面临界图的最大顶点数的一个尖锐的上界,其中每个非边界顶点的度为3或4。

英文摘要:

Define a boundary point of a graph which is embedded in the Euclidean plane a vertex which is incident to only one edge. In this paper we consider graphs which are embedded in the Euclidean plane with a finite number of boundary points. The simple geometric condition we impose on them is that the sum of unit vectors of edges extending from each non-boundary vertex will be equal to zero. We call such a graph a critical graph and ask to maximise the number of vertices of critical graphs with a given size of boundary. The main results of this paper give a sharp upper bound for the maximum number of vertices of planar critical graphs, where the degree of each non-boundary vertex is 3 or 4.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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