In this paper, the notation of the optimal k-vertex colouring is introduced , and some boundaries for the chromatic number of a graph are given.
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韦一平 方坤夫.顶点着色的若干结果[J].重庆工商大学学报(自然科学版),2003,(4): WEI Yi-ping~,FANG Kun-fu~. Some results on the vertex colourings[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2003,(4):