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棒棒糖图的IC-着色和IC-指数
引用本文:张楚文,王力工. 棒棒糖图的IC-着色和IC-指数[J]. 华东交通大学学报, 2014, 0(6): 108-113
作者姓名:张楚文  王力工
作者单位:西北工业大学理学院应用数学系,陕西 西安,710072
基金项目:国家自然科学基金(11171273);国家大学生创新创业训练计划项目
摘    要:棒棒糖图Bm,n是由圈Cm上的任一个顶点和路Pn的一个1度顶点重合而得到n+m-1阶连通图。研究了棒棒糖图Bm,n的IC-着色和IC-指数,推出了它的IC-指数的一个上界,并借助计算机编程,证明了m分别为3,4,5时的几种棒棒糖图Bm,n的IC-着色和IC-指数。当m=3,n=1,2,…,6时,有M(B3,n)=5n+2;当m=4,n=1,2,…,5时,有M(B4,1)=13,M(B4,2)=21,M(B4,3)=26,M(B4,4)=34,M(B4,5)=40;当m=5,n=1,2,3,4时,有M(B5,1)=21,M(B5,2)=31,M(B5,3)=39,M(B5,4)=48。

关 键 词:IC-着色  IC-指数  棒棒糖图

IC-indices and IC-colorings of Lollipop Graphs
Zhang Chuwen,Wang Ligong. IC-indices and IC-colorings of Lollipop Graphs[J]. Journal of East China Jiaotong University, 2014, 0(6): 108-113
Authors:Zhang Chuwen  Wang Ligong
Affiliation:(Department of Applied Mathematics, Northwestern Polytechnical University, Xi'an 710072, China)
Abstract:The lollipop graph Bm,n is a connected graph obtained by identifying any vertex of a cycle Cm and a vertex of degree 1 of a path Pn . This paper studies the IC-indices and maximal IC-colorings of lollipop graphs. An upper bound of the IC-index of the lollipop graph Bm,n is obtained. By using a computer search, the IC-indices and maximal IC-colorings of several lollipop graphs Bm,n are obtained. The results are as follows:When m=3 and n=1,2,…,6 , M(B3,n)=5n+2; When m=4 , M(B4,1)=13, M(B4,2)=21, M(B4,3)=26,M(B4,4)=34. When m=5 , M(B5,1)=21, M(B5,2)=31, M(B5,3)=39,M(B5,4)=48.
Keywords:IC-coloring  IC-index  lollipop graphs
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