讨论了顺次联图邻域完整度的一些性质.设S是图G的一个点子集,如果从G中删去S的闭邻域中所有点,则称S为G的一个点颠覆策略.记幸存子图为G/S,图G的邻域完整度定义为VN I(G)=m inS V(G){S+m(G/S)},其中S为G的任意一个点颠覆策略,m(G/S)表示...讨论了顺次联图邻域完整度的一些性质.设S是图G的一个点子集,如果从G中删去S的闭邻域中所有点,则称S为G的一个点颠覆策略.记幸存子图为G/S,图G的邻域完整度定义为VN I(G)=m inS V(G){S+m(G/S)},其中S为G的任意一个点颠覆策略,m(G/S)表示G/S的最大连通分支所含点数.展开更多
A labeling f of a graph G is a bijection from its edge set E（G） to the set {1, 2, ..., ｜E（G）｜}, which is antimagic if for any distinct vertices x and y, the sum of the labels on edges incident to x is different ...A labeling f of a graph G is a bijection from its edge set E（G） to the set {1, 2, ..., ｜E（G）｜}, which is antimagic if for any distinct vertices x and y, the sum of the labels on edges incident to x is different from the sum of the labels on edges incident to y. A graph G is antimagic if G has an f which is antimagic. Hartsfield and Ringel conjectured in 1990 that every connected graph other than K2 is antimagic. In this paper, we show that if G1 is an n-vertex graph with minimum degree at least r, and G2 is an m-vertex graph with maximum degree at most 2r - 1 （m ≥ n）, then G1 V G2 is antimagic.展开更多
The minimum number of total independent partition sets of V ∪ E of graph G（V,E） is called the total chromatic number of G denoted by χt（G）. If the difference of the numbers of any two total independent partition...The minimum number of total independent partition sets of V ∪ E of graph G（V,E） is called the total chromatic number of G denoted by χt（G）. If the difference of the numbers of any two total independent partition sets of V ∪ E is no more than one＇, then the minimum number of total independent partition sets of V ∪ E is called the equitable total chromatic number of G, denoted by χet（G）. In this paper, we obtain the equitable total chromatic number of the join graph of fan and wheel with the same order.展开更多
L(2,1)-labeling number of the product and the join graph on two fans are discussed in this paper, we proved that L(2,1)-labeling number of the product graph on two fans is?λ(G) ≤ Δ+3 , L(2,1)-labeling number of the...L(2,1)-labeling number of the product and the join graph on two fans are discussed in this paper, we proved that L(2,1)-labeling number of the product graph on two fans is?λ(G) ≤ Δ+3 , L(2,1)-labeling number of the join graph on two fans is?λ(G) ≤ 2Δ+3.展开更多
文摘讨论了顺次联图邻域完整度的一些性质.设S是图G的一个点子集,如果从G中删去S的闭邻域中所有点,则称S为G的一个点颠覆策略.记幸存子图为G/S,图G的邻域完整度定义为VN I(G)=m inS V(G){S+m(G/S)},其中S为G的任意一个点颠覆策略,m(G/S)表示G/S的最大连通分支所含点数.
基金Supported by Fundamental Research Funds for the Central Universities(Grant No.2011B019)National Natural Science Foundation of China(Grant Nos.11101020,11171026,10201022and10971144) Natural Science Foundation of Beijing(Grant No.1102015)
文摘A labeling f of a graph G is a bijection from its edge set E（G） to the set {1, 2, ..., ｜E（G）｜}, which is antimagic if for any distinct vertices x and y, the sum of the labels on edges incident to x is different from the sum of the labels on edges incident to y. A graph G is antimagic if G has an f which is antimagic. Hartsfield and Ringel conjectured in 1990 that every connected graph other than K2 is antimagic. In this paper, we show that if G1 is an n-vertex graph with minimum degree at least r, and G2 is an m-vertex graph with maximum degree at most 2r - 1 （m ≥ n）, then G1 V G2 is antimagic.
基金Supported by the National Natural Science Foundation of China(No.10771091)
文摘The minimum number of total independent partition sets of V ∪ E of graph G（V,E） is called the total chromatic number of G denoted by χt（G）. If the difference of the numbers of any two total independent partition sets of V ∪ E is no more than one＇, then the minimum number of total independent partition sets of V ∪ E is called the equitable total chromatic number of G, denoted by χet（G）. In this paper, we obtain the equitable total chromatic number of the join graph of fan and wheel with the same order.
文摘L(2,1)-labeling number of the product and the join graph on two fans are discussed in this paper, we proved that L(2,1)-labeling number of the product graph on two fans is?λ(G) ≤ Δ+3 , L(2,1)-labeling number of the join graph on two fans is?λ(G) ≤ 2Δ+3.
