Returns the fan of the underlying toric variety. This is an object of the package OldPolyhedra. See also Fan.
i1 : E = tangentBundle hirzebruchFan 3
o1 = {dimension of the variety => 2 }
number of affine charts => 4
number of rays => 4
rank of the vector bundle => 2
o1 : ToricVectorBundleKlyachko
i2 : F = fan E
o2 = {ambient dimension => 2 }
number of generating cones => 4
number of rays => 4
top dimension of the cones => 2
o2 : Fan