摘要
由Ｖｉｎｃｅ引进的星色数的概念是图的色数的一个自然推广，它们之间有着许多类似的性质．本文给出了一类星色数为３．５的平面图，回答了Ｖｉｎｃｅ提出的部分问题．
Star-chromatic number of a graph introduced by A.Vince is a natural generalization of the chromatic number. In this paper, We give an infinite family of planargraphs whose star-chromatic number is 3.5, partially answering a question of A. Vincein[1].
关键词
星色数
扇形图
同态
tar-chromatic number Fan graph Homomorphism
