匹配计数理论是图论的核心内容之一.但是,一般图的完美匹配计数问题却是NP-难问题.文章用划分、求和、再递推的方法给出了5类图完美匹配数目的显式表达式,所给出的方法,可以计算出许多特殊图的所有完美匹配的数目.
Matching counting theory is at the core of graph theory. However the problem of counting the number of perfect matchings for general graphs is NP-hard. By applying differentiation,summation and re- recursion calculation, the several counting formulas of the perfect matchings for five specific types of graphs are given. By the method, the number of all perfect matchings of many bipartite graphs can be calculated.