纸质出版日期:2012,
网络出版日期:2012-9-25
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将k--优美图的概念进行了推广,引入A~B优美图的概念,并以此为基础,得到了非连通图(P3m3m是优美图的一个充分条件。证明了对任意正整数k,m,n,t,当k≤n≤t,n+k-1≤m时,图(P3mkj=1Kn,t) 和(C3mkj=1Kn,t)是优美图;当k=1,2,2≤n<2m+1时,图(P3∨Km)∪k∪j=1Pn,(C3∨Km)∪k∪j=1Pn 和(P3∨Km)∪ Pn∪St(t)是优美图;当2≤n≤2m+1时,(P3∨Km)∪ Pn∪St(t) 是优美图。本文的结果推广了现有的一些结论。
The definition of k-graceful graph is extended and the new concept of A~B graceful graph is presented.One sufficient condition about determining the gracefulness of unconnected graph(P3m3mis obtained.In the meanwhile, it is proved that for any natural numbersk,m,n,twhich are not less than one, when k≤n≤t and n+k-1≤m, the disconnected graphs(P3mkj=1Kn,t) and(C3mkj=1Kn,t) are graceful; when k=1,2, 2≤n<2m+1 the graphs (P3∨Km)∪k∪j=1Pn,(C3∨Km)∪k∪j=1Pnand (P3∨Km)∪ Pn∪St(t) are graceful; when 2≤n≤2m+1, the graphs (P3∨Km)∪ Pn∪St(t) are graceful. Results generalize some of the known results.
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