The Combinatorics of Al-Salam-Chihara qq-Laguerre polynomials

preprint2010arXivOpen access

Abstract

We describe various aspects of the Al-Salam-Chihara qq-Laguerre polynomials. These include combinatorial descriptions of the polynomials, the moments, the orthogonality relation and a combinatorial interpretation of the linearization coefficients. It is remarkable that the corresponding moment sequence appears also in the recent work of Postnikov and Williams on enumeration of totally positive Grassmann cells.

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