本文研究了图有分数因子的度条件,得到了下面的结果:令κ≥1是一个整数,G是一个连通的n阶图,n≥4κ-3且最小度δ(G)≥κ.若对于每一对不相邻的顶点u,v ∈V(G)都有max{dG(u),dG(v)≥n/2,则G有分数κ-因子.并指出该结果在一定意义上是最好可能的.
In this paper, a degree condition for a graph to have fractional factors is studied. The following result is obtained. Let k be an integer such that κ≥ 1, and let G be a connected graph of order n with n ≥ 4κ - 3, and minimum degree 5(G)≥κ. If G satisfies max{(dG(u),dG(v)} ≥n/2 for each pair of nonadjacent vertices u,v ∈V(G), then G has a fractional κ-factor. Furthermore, we prove that the result is the best possible in some sense.