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Macaulay2 web site
dual(Arrangement) -- the Gale dual of A
Synopsis
Usage:
dual A
Function:
dual
Inputs:
A
,
a
hyperplane arrangement
Outputs:
a
hyperplane arrangement
Description
The Gale transform of a rank
l
arrangement 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
.