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Polished some pattern avoidance
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patriciajklein committed Oct 31, 2023
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4 changes: 2 additions & 2 deletions MatrixSchubert/permutationMethodsDOC.m2
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Description
Text
Given a permutation in 1-line notation, checks if the permutation is Cartwright-Sturmfels. By [CDG22], the matrix
Schubert variety $X_w$ is Cartwright-Sturmfels if and only if $w$ avoid all of the patterns
Schubert variety $X_w$ is Cartwright-Sturmfels if and only if $w$ avoids all of the patterns
$\{12543, 13254, 13524, 13542, 21543, 125364, 125634, 215364, 215634, 315264, 315624, 315642\}$.

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Given a permutation in 1-line notation, checks if the permutation is CDG. We say that a permutation $w$ is CDG
if a certain modification (see [Kle23] for precise description) of the Fulton generators of the Schubert determinantal
ideal $I_w$ form a diagonal Gröbner basis. By [Kle23], $w$ satisfies the CDG property if and only if $w$ avoid all of the patterns
ideal $I_w$ form a diagonal Gröbner basis. By [Kle23], $w$ is CDG if and only if $w$ avoid all of the patterns
$\{13254, 21543, 214635, 215364, 215634, 241635, 315264, 4261735\}$.

@UL {
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