outer planar graph 外部平面图
planar graph of network [电子] 平面网络图
a planar graph 平面图
cubic planar graph 三次平面图
simple planar graph 简单平面图
regular planar graph 正则平面图
maximum planar graph 极大平面图
connected planar graph 连通平面图
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Trapezoidal no volume! It is a planar graph!
梯形没有体积！它是一个平面图形！
The (4,6)-regular maximum planar graph is studied, and its existence condition and construction method are obtained respectively.
本文讨论了（4，6）-正则极大平面图，得到了（4，6）-正则极大平面图的存在条件及构造方法。
In this paper, Euler's formula and Handshaking lemma is used to obtain the face chromatic number of a planar graph by solving equations.
本文在前人研究的面着色问题基础上，运用欧拉公式和握手定理通过解方程组得到连通平面图的面色数。
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