用构造的方法给出图1-3n-K3,P(n,2,n-1)和I(K(1,1,n))的优美标号,从而证明了1-3n-K3,P(n,2,n-1)和I(K(1,1,n))都是优美图.
In the constructor method,graceful labeling of 1-3n-K3,P(n,2,n-1)and I(K(1,1,n))has been given,which proved that 1-3n-K3,P(n,2,n-1)and I(K(1,1,n))are graceful graphs.