证明了当k≥2时,非连通图G+e∪Hk-1是优美图,其中G是特征为k的平衡二分图,Hk-1是任意一个k-1条边的优美图.
It is proved that if k≥2 then unconnected graph G+e∪Hk-1 is a graceful graph, where G is balanced bipartite graph and Hk-1 is a graceful graph with k-1 edges.