摘要
刘儒英介绍了图的特征标R(G),并分别给出当R(G)=0和R(G)=1时图类所具有的性质并对图类进行描述,本文推广此结果,讨论了R(G)=-1和R(G)=-2时的情形,并证明了两类具备一定性质的图并的补图的色唯一性.
R(G) was introduced by Liu, and he gave the properties of the classes of graphs and described them respectively when R(G)=0 and R(G)=1. Here, we extend this result to the cases of R(G)=-1 and R(G)=-2, then we prove that the union of two classes of graphs are chromatically unique under the certain conditions.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2005年第3期39-42,共4页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
国家自然科学基金资助项目(10271017
60373030)
北京交通大学基金资助项目(2004SM054)
关键词
图论
不可约图
色唯一性
补图
graph theory
irreducible graph
chromatic uniqueness
complementary graph