I = gfanLatticeIdeal L
This method computes the generators for the lattice ideal. The input should be a list of points that generate the lattice.
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The lattice ideal of a free abelian subgroup $L$ of $\mathbb Z^n$ is the ideal generated by $ \mathbf{x}^{\alpha^+} - \mathbf{x}^{\alpha^-}$ for $\alpha =\alpha^+ - \alpha^- \in L$.
gfan Documentation
This program computes the lattice ideal of a lattice. The input is a list of generators for the lattice.
Options:
-t:
Compute the toric ideal of the matrix whose rows are given on the input instead.
--convert:
Does not do any computation, but just converts the vectors to binomials.
The object gfanLatticeIdeal is a method function with options.