用划分、求和、再递推的方法给出了4类图完美匹配数目的显式表达式,用此方法可以计算出许多图的所有完美匹配的数目.
In this paper, by applying differentiation, summation and re-recursion calculation, Several counting formulas of the perfect matchings for four specific types of graphs are given. By the method presented in this paper,the number of all perfect matchings of many graphs can be calculated.