方法利用匹配多项式的定义和性质推导。
Methods The character and definition of matching polynomials are used to compute.
利用匹配多项式根的信息，根据其定义以及图的度序列和匹配多项式的性质推导。
Use the information of the matching roots, and the character of the degree sequence and matching polynomials to compute.
以无基集为基础，结合最大无基集的定义，提出一个多项式时间算法。
Based on the definitions of the unfounded set and the greatest unfounded set, it proposes a polynomial time algorithm.
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