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- W4381569507 abstract "We study a basis of the polynomial ring that we call forest polynomials. This family of polynomials is indexed by a combinatorial structure called indexed forests and permits several definitions, one of which involves flagged P-partitions. As such, these polynomials have a positive expansion in the basis of slide polynomials. By a novel insertion procedure that may be viewed as a generalization of the Sylvester correspondence we establish that Schubert polynomials decompose positively in terms of forest polynomials. Our insertion procedure involves a correspondence on words which allows us to show that forest polynomials multiply positively. We proceed to show that forest polynomials are a particularly convenient basis in regards to studying the quotient of the polynomial ring modulo the ideal of positive degree quasisymmetric polynomials. This aspect allows us to give a manifestly nonnegative integral description for the Schubert class expansion of the cohomology class of the permutahedral variety in terms of a parking procedure. We study the associated combinatorics in depth and introduce a multivariate extension of mixed Eulerian numbers." @default.
- W4381569507 created "2023-06-22" @default.
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- W4381569507 date "2023-06-19" @default.
- W4381569507 modified "2023-10-18" @default.
- W4381569507 title "Forest polynomials and the class of the permutahedral variety" @default.
- W4381569507 doi "https://doi.org/10.48550/arxiv.2306.10939" @default.
- W4381569507 hasPublicationYear "2023" @default.
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