dual(CentralArrangement) -- the Gale dual of A

Synopsis

• Function: dual

• Usage:

  dual A

• Inputs:
  • A, a central hyperplane arrangement
• Outputs:
  • a central hyperplane arrangement

Description

The Gale transform of a rank larrangement of n hyperplanes is an arrangement of n hyperplanes of rank n-l. Here it is computed as the arrangement given by the rows of the matrix presenting the kernel of the cofficients of A.