相关期刊:《Journal of Mathematical Research with Applications》《Science China Mathematics》《Acta Mathematicae Applicatae Sinica》《Chinese Quarterly Journal of Mathematics》更多>>
Supported by the National Natural Science Foundation of China(Grant No.11771080).
A coloring of edges of a graph G is injective if for any two distinct edges e1 and e2,the coloring of e1 and e2 are distinct if they are at distance 2 in G or in a common 3-cycle.The injective chromatic index of G is ...
Supported by National Natural Science Foundation of China(Grant Nos.12171440 and 11971445)。
Let G be a graph and C be an arbitrary even cycle of G.The graph G is called a cycle-forced graph if G-V(C)has a unique perfect matching.When C is an arbitrary induced even cycle of G,G is called an induced-cycle-forc...
supported by the National Natural Science Foundation of China(No.11871398);the Natural Science Basic Research Plan in Shaanxi Province of China(Program No.2018JM1032);the Fundamental Research Funds for the Central Universities(No.3102019ghjd003);the Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University(No.ZZ2019031)
The degree d(H)of a subgraph H of a graph G is|u∈∪V(H)N(u)-V(H)|,where N(u)denotes the neighbor set of the vertex u of G.In this paper,we prove the following result on the condition of the degrees of subgraphs.Let G...
Supported by the National Natural Science Foundation of China(10771179)
The induced matching cover number of a graph G without isolated vertices, denoted by imc(G),is the minimum integer k such that G has k induced matchings {M1,M2,···,Mk}such that,V(M1)∪V(M2)∪···∪V(Mk)covers V(G...
the National Nature Science Foundation of China (Grant Nos.10571117,60773078);the Hong Kong Polytechnic University (Grant No.G-YX69) ;Shuguang Plan of Shanghai Education Development Foundation (Grant No.06SG42)
A clique-transversal set D of a graph G is a set of vertices of G such that D meets all cliques of G. The clique-transversal number, denoted τ c (G), is the minimum cardinality of a clique-transversal set in G. In th...
A graph is called claw-free if it does not contain a claw as its induced subgraph.In this paper, we prove the following results:1)If G is a 2-connected claw-free graph on n vertices,then for any vertex v and any two d...
In this paper it is shown that every connected claw-free graph G contains connected [a, max{a + 2, b}]-factors if it has [a, b]-factors, where a, b are integers and b ≥ a ≥ 1.
We prove the following result: Let G be a 2 connected claw free graph of order n(n≥3) and connectivity k . If for any independent set S k+1 with cardinality k+1 , there exist u,v∈S k+1 ...