在地图计数理论中,适当地选择计数的方法不仅能使计数过程得到简化,而且还能使计数结果尽可能地优化.利用参数化的计数方法使得近2-正则有根平面地图依根点次、非根点数和根面次的一组计数结果得到了充分的简化。
In the theory of enumerating maps, properly choosing a method for enumerating the maps is not only a simplification in processes but also a optimum in results. This paper just provides a parametric method for enumerating rooted 2-regular planar maps with the valency of root-vertex, the number of non-root vertecies and the valency of root-face as three parameters such that some enumerating results on the maps are simplified greatly.