diagLexInitNW w
diagLexInitNW A
Given a partial alternating sign matrix or a permutation in 1-line notation, returns the diagonal initial ideal of the corresponding ASM ideal or Schubert determinantal ideal with respect to lexicographic order, where the variables are ordered reading from left-to-right and top-to-bottom (starting in the northwest corner).
This function computes over the coefficient field of rational numbers unless an alternative is specified.
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The object diagLexInitNW is a method function with options.