In this paper,we set the conception of quadratic form of a graph and quartic form of a graph, the necessary sufficient condition on 1-factor of graphs and 2-factor of paar graphs and obtain a counting formula for 1-factor of graphs.
本文应用图的二次型与四次型的概念,得到图有1-因子、偶图有2-因子的充要条件,并且得到了图的1-因子的计数公式。
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