图G的粘合运算Guv指的是重合G的两个顶点(u,v)并且去掉重边和环所得到的简单图.考虑了粘合运算对图的两个参数韧度t(G)与孤立韧度I(G)的影响.刻画了图Guv与图G的参数t(G),I(G)之间的关系.
It is supposed that G is a simple graph with vertex set V(G) and edge set E(G), For u ,v∈V(G), the vertices u and v are identified, and all resulting loops and duplicate edges are removed, The influences of vertex-contraction on parameters, toughness t (G) and isolated toughness I(G), are considened, The relationship of toughness and isolated toughness with Guv and G are given.