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

## Synopsis

• Function: fan
• Usage:
F = fan E
• Inputs:
• Outputs:
• F, an instance of the type Fan

## Description

Returns the fan of the underlying toric variety. This is an object of the package Polyhedra. 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 = F o2 : Fan i3 : rays F o3 = | 1 0 0 -1 | | 0 -1 1 3 | 2 4 o3 : Matrix ZZ <--- ZZ