fan(ToricVectorBundle) -- the underlying fan of a toric vector bundle

Synopsis

Function: fan
Usage:

F = fan E
Inputs:
- E, an instance of the type ToricVectorBundle
Outputs:
- F, an instance of the type Fan

Description

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

i3 : rays F

o3 = {| 0  |, | 0 |, | -1 |, | 1 |}
      | -1 |  | 1 |  | 3  |  | 0 |

o3 : List