2016
DOI: 10.48550/arxiv.1605.05405
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The ABC's of affine Grassmannians and Hall-Littlewood polynomials

Abstract: We give a new description of the Pieri rule for k-Schur functions using the Bruhat order on the affine type-A Weyl group. In doing so, we prove a new combinatorial formula for representatives of the Schubert classes for the cohomology of affine Grassmannians. We show how new combinatorics involved in our formulas gives the Kostka-Foulkes polynomials and discuss how this can be applied to study the transition matrices between Hall-Littlewood and k-Schur functions.Nous présentons une nouvelle description, issue … Show more

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