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Remarks on Extremal Overfull Graphs
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作者 Modjtaba Ghorbani 《Applied Mathematics》 2013年第8期1106-1108,共3页
An overfull graph is a graph whose number of its edges is greater than the product of its maximum degree and?[n/2] , where n is the number of vertices. In this paper, some extremals of overfull graphs are presented. W... An overfull graph is a graph whose number of its edges is greater than the product of its maximum degree and?[n/2] , where n is the number of vertices. In this paper, some extremals of overfull graphs are presented. We also classify all plannar overfull graphs. 展开更多
关键词 Overfull graph Edge CHROMATIC NUMBER plannar graph
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极大平面图中二色树子图的一个必要条件
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作者 许寿椿 《中央民族大学学报(自然科学版)》 2005年第3期206-208,共3页
极大平面图G=(V,E)中的一个二色树子图T=(Vt,Et),其Vt在G中导出子图为树,并且图G存在至少一个四着色C,使T是该四着色一个二色子图的一个连通支.本文证明了Vt的点次和为偶数是它成为二色树子图的必要条件.
关键词 极大平面图 四色问题 二色子图
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