摘要
设f是图G的一个正常边染色.对任意x∈V(G),令S(x)表示与点x相关联的边的颜色所构成的集合.若对任意u,v∈V(G),u≠v,有S(u)≠S(v),则称f是图G的一个点可区别正常边染色.对一个图G进行点可区别正常边染色所需的最少的颜色的数目称为G的点可区别正常边色数,记为χ_s'(G).讨论了图K_(3,4)∨K_t的点可区别正常边染色及其色数,利用正多边形的对称性构造染色以及组合分析的方法,确定了图K_(3,4)∨K_t的点可区别正常边色数,得到了当t是大于等于2的偶数以及t是奇数且3≤t≤25时,χ_s'(K_(3,4)∨K_t)=t+7;当t是奇数且t≥27时,χ_s'(K_(3,4)∨K_t)=t+8.
Let f be a proper edge coloring of G. For each x ∈ V(G), let S(x) denote the set of all colors of the edges incident with x. If A↓ u, v ∈ V(G), u ≠ v, we have S(u) ≠S(v), then f is called a vertex distinguishing proper edge coloring of G. The minimum number k for which there exists a vertex distinguishing proper edge coloring of G using k colors is called the vertex distinguishing proper edge chromatic number of G and denoted by X′(G). In this paper, we discuss vertex-distinguishing proper edge colorings of K3,4 V Kt. By using symmetry of regular polygons to construct coloring and methods of combinatorial analysis, we showed that for t is even with t 〉 2 or t is odd with 3 〈 t 〈 25, we have X′s(g3,4 V Kt) = t+7; for t is odd with t 〉 27, we have X′s(K3,4 V Kt) = t + 8.
出处
《数学的实践与认识》
CSCD
北大核心
2012年第18期235-241,共7页
Mathematics in Practice and Theory
基金
国家自然科学基金(61163037
61163054)
宁夏自然基金(NZ1154)
宁夏大学科学研究基金((E):ndzr10-7)
西北师范大学"知识与科技创新工程"科研基金nwnu-kjcxgc-03-61)
关键词
正常边染色
点可区别正常边染色
点可区别正常边色数
proper edge coloring
vertex-distinguishing proper edge coloring
vertex-distinguishingproper edge chromatic number