射影平面上单面地图的计数(英文)

Number of One Faced Maps on the Projective Plane

任何一类非平面地图的精确计算都是十分困难的．通过射影平面上的有根单地图数目的探讨，提供了一个具有两个变量的精确公式．

It is well known that finding explicit expressions for any kind of nonplanar maps is very difficult. In this paper we count the number of rooted maps with only one face on the projective plane and find an exacet expression with up to two parameters for such maps.