Séminaire Lotharingien de Combinatoire, 91B.91 (2024), 12 pp.
Sarah Gold, Elizabeth Milićević and Yuxuan Sun
Crystal Chute Moves on Pipe Dreams
Abstract.
Schubert polynomials represent a basis for the cohomology of the complete flag variety and thus play a central role in geometry and combinatorics. In this context, Schubert polynomials are generating functions over various combinatorial objects, such as rc-graphs or reduced pipe dreams. By restricting Bergeron and Billey's chute moves on rc-graphs, we define a Demazure crystal structure on the monomials of a Schubert polynomial. As a consequence, we provide a method for decomposing Schubert polynomials as sums of key polynomials, complementing related work of Assaf and Schilling via reduced factorizations with cutoff, as well as Lenart's coplactic operators on biwords.
Received: November 15, 2023.
Accepted: February 15, 2024.
Final version: April 1, 2024.
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