摘要
文献[1,2]讨论了路圈及其并的补图的色性,本文用新方法证明了图PkU(UC(ui))的补图在k=3.5或k≠4为偶数的条件下色唯一,改进了[1,2]的结果。
In[1,2] obtained the chromaticity of the complement of the union of paths and cycles. In this paper, using the new method, We prove that the complement of Pk U (U Cui) is chromatically unique if k=3 or k=5 or k is an even integer which is not equal to four.
出处
《青海师范大学学报(自然科学版)》
1999年第4期1-8,共8页
Journal of Qinghai Normal University(Natural Science Edition)
关键词
色唯一
色多项式
伴随多项式
路
圈
并
补图
chromatic uniqueness
chromatic polynomial
adjoint polynomial