Connection between Schubert polynomials and top Lascoux polynomials
Tianyi Yu
Source abstract
Schubert polynomials form a basis of the polynomial ring ℚ [ x 1 , x 2 , ⋯ ] . This basis and its structure constants have received extensive study. Recently, Pan and Yu initiated the study of top Lascoux polynomials. These polynomials form a basis of the vector space V ^ , a sub-algebra of ℚ [ x 1 , x 2 , ⋯ ] where each graded piece has finite dimension. This paper connects Schubert polynomials and top Lascoux polynomials via a simple operator. We use this connection to show these two bases share the same structure constants. We also translate several results on Schubert polynomials to top Lascoux polynomials, including combinatorial formulas for their monomial expansions and supports.
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