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The term"graceful graph"was proposed by Professor S.W.Golomb in Southen Califor-nia University in 1972[1].A question arisen in reference [1] is answered in this article. Let G be a simple graph of γ vertices and εedges.G is graceful if there is a labelling l ofits vertices with distinct integers from the set{0,1,…,ε},so that the induced edge labellingl’defined by 相似文献
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