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机构地区:[1]西北民族大学数学与计算机科学学院,兰州730030
出 处:《武汉理工大学学报(交通科学与工程版)》2012年第5期1098-1100,共3页Journal of Wuhan University of Technology(Transportation Science & Engineering)
基 金:国家民委科研项目资助(批准号:10XB01)
摘 要:简单图G和H的合成图是指具有顶点集V(G)×V(H)的简单图G[H],它的顶点(u,v)和另一个顶点(u′,v′)相邻当且仅当或者uu′∈E(G),或者u=u′且vv′∈E(H).文中研究了n+1阶简单图G与m阶简单图H的合成图的星全染色,其中G为轮Wn,扇Fn,或星Sn.得到以下结果:(1)若Δ(H)=2且n≥4,m≥5,则G[H]的星全色数为(2n+1)m;(2)若χ′(H)=Δ(H)=m-1且n,m≥4,则G[H]的星全色数为2(n+1)m-1.The composition of simple graphs G and H is the simple graph G[H] with vertex set V(G) X V(H), in which (u,~) is adjacent to (u' ,v') if and only if either uu' 6: E(G) or u=u' and vv' 6: E(H). The paper focused on the star total coloring of the composition of a simple graph G with n+1 vertices and a simple graph H with m vertices, where O is a wheel, fan, or star. And the following results are obtained: (1) if △(H)=2 and n≤4,m≥5, then the star total chromatic number of graph G[H] is (2n+1)m; (2) if X (H)=A(H)=m-1, and n,m≥4, then the star total chromatic number of graph G[H] is 2(n+1)m-1. Key words:composition graph; star total coloring; star total chromatic number
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