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• W2950552635 abstract "We give an explicit combinatorial Chevalley-type formula for the equivariant K-theory of generalized flag varieties G/P which is a direct generalization of the classical Chevalley formula. Our formula implies a simple combinatorial model for the characters of the irreducible representations of G and, more generally, for the Demazure characters. This model can be viewed as a discrete counterpart of the Littelmann path model, and has several advantages. Our construction is given in terms of a certain R-matrix, that is, a collection of operators satisfying the Yang-Baxter equation. It reduces to combinatorics of decompositions in the affine Weyl group and enumeration of saturated chains in the Bruhat order on the (nonaffine) Weyl group. Our model easily implies several symmetries of the coefficients in the Chevalley-type formula. We also derive a simple formula for multiplying an arbitrary Schubert class by a divisor class, as well as a dual Chevalley-type formula. The paper contains other applications and examples." @default.
• W2950552635 created "2019-06-27" @default.
• W2950552635 creator A5029129697 @default.
• W2950552635 creator A5052175642 @default.
• W2950552635 date "2003-09-12" @default.
• W2950552635 modified "2023-09-27" @default.
• W2950552635 title "Affine Weyl groups in K-theory and representation theory" @default.
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