f = map(X,Y,L)
This method creates a EquivariantMap given a GKM variety $X$, a GKM variety $Y$, and a list L of pairs (x,y) where x and y are members of X.points and Y.points (respectively), indicating that the torusfixed point x of X is sent to the torusfixed point y of Y under the map.
The following describes the projection from the third Hizerbruch surface to the projective line.





This does not check that the morphism is well defined. In particular, it does not verify that the map on torusfixed points is induced by a morphism of GKM varieties.