# Fan * Fan -- computes the direct product

## Synopsis

• Operator: *
• Usage:
F = F1 * F2
• Inputs:
• F1, an instance of the type Fan
• F2, an instance of the type Fan
• Outputs:
• F, an instance of the type Fan

## Description

Computes the direct product of two fans. This is the fan given by C=C1 x C2 for all cones C1 in F1 and C2 in F2, in the direct product of the ambient spaces.

 i1 : F1 = normalFan hypercube 1 o1 = {ambient dimension => 1 } number of generating cones => 2 number of rays => 2 top dimension of the cones => 1 o1 : Fan i2 : F2 = normalFan hypercube 2 o2 = {ambient dimension => 2 } number of generating cones => 4 number of rays => 4 top dimension of the cones => 2 o2 : Fan i3 : F = F1 * F2 o3 = {ambient dimension => 3 } number of generating cones => 8 number of rays => 6 top dimension of the cones => 3 o3 : Fan i4 : F == normalFan hypercube 3 o4 = true