摘要
设G是一个n阶2-连通图,m>0是一个整数.本文证明了:如果对于图G中任意三点独立集S={u,v,w}},都存在x≠y∈S使得d(x)+d(y)≥m,则c(G)≥min{n,m}.其中c(G)表示图G的周长.这个结果推广了三个有关的已知结果。
Let G be a 2-connected graph on n vertices and m>0 be an integer.In this paper,we show that if for any independent set S={u,v,w}of G, there exist x≠y∈S such that d(x)+d(y),then min{n,m} where c(G)is the circumference of G. This generalizes three related results known before.
关键词
独立集
周长
哈密顿图
连通图
independent set
circumference
hamiltonian graph