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Deformed Kazhdan-Lusztig elements and Macdonald polynomials (1007.0861v2)

Published 6 Jul 2010 in math.CO, math-ph, math.MP, and math.RT

Abstract: We introduce deformations of Kazhdan-Lusztig elements and specialised nonsymmetric Macdonald polynomials, both of which form a distinguished basis of the polynomial representation of a maximal parabolic subalgebra of the Hecke algebra. We give explicit integral formula for these polynomials, and explicitly describe the transition matrices between classes of polynomials. We further develop a combinatorial interpretation of homogeneous evaluations using an expansion in terms of Schubert polynomials in the deformation parameters.

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