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arXiv 1401.4372math.CO
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正则火柴棒图

Regular matchstick graphs

Sascha Kurz, Rom Pinchasi

摘要:

一个图G=(V,E)称为平面单位距离图,如果V在平面中有一个内射嵌入,使得每对邻顶点相距单位距离.另外,如果对应的边是不相交的,并且所有的顶点都有相同的度r,我们称之为正则火柴棒图。由于欧拉多面体公式,我们有$r\le 5$。已知最小的4-正则火柴棒图是由52个顶点组成的Harborth图。本文证明了不存在有限的5-正则火柴棒图,并给出了4-正则火柴棒图顶点数的一个下界。

英文摘要:

A graph G=(V,E) is called a unit-distance graph in the plane if there is an injective embedding of V in the plane such that every pair of adjacent vertices are at unit distance apart. If additionally the corresponding edges are non-crossing and all vertices have the same degree r we talk of a regular matchstick graph. Due to Euler's polyhedron formula we have $r\le 5$. The smallest known 4-regular matchstick graph is the so called Harborth graph consisting of 52 vertices. In this article we prove that no finite 5-regular matchstick graph exists and provide a lower bound for the number of vertices of 4-regular matchstick graphs.

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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