Supported by NNSF of China(10271048,10671073);Supported by Science and Technology Commission of Shanghai Municipality(07XD14011);Supported by Shanghai Leading Academic Discipline Project(B407)
In this paper, we show that for a locally LEW-embedded 3-connected graph G in orientable surface, the following results hold: 1) Each of such embeddings is minimum genus embedding; 2) The facial cycles are precisel...
Supported by the National Natural Science Foundation of China(No.10271048,10671073);Supported by Shanghai Leading Academic Discipline Project(No.B407);Science and Technology Commission of Shanghai Municipality(No.07XD14011)
In this paper we investigate cycle base structures of a (weighted) graph and show that much information of short cycles is contained in a MCB (minimum cycle base). After setting up a Hall type theorem for base-tra...
结合边连通度,探讨了独立集中具有最小特定度和的点的上可嵌入图.得到了下列结果.(1)设G是一个2-边连通简单图且满足条件:对任意一个G的3-独立集I,x_i,x_j∈I(i,j=1,2,3),d(x_i,x_j)≥3(1≤i≠j≤3)sum from i=1 to 3 d(x_i)≥v+1 (v=V...
Supported by the National Natural Science Foundation of China(10271048)and Shanghai Priority Academic Discipline and Sci-ence and Technology Commission of Shanghai Municipality(04JC14031).