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Lecture hall graphs and the Askey scheme
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abstract
We establish, for every family of orthogonal polynomials in the $ q $-Askey scheme and the Askey scheme, a combinatorial model for mixed moments and coefficients in terms of paths on the lecture hall graph. This generalizes the previous results of Corteel and Kim for the little $ q $-Jacobi polynomials. We build these combinatorial models by bootstrapping, beginning with polynomials at the bottom and working towards Askey--Wilson polynomials which sit at the top of the $ q $-Askey scheme. As an application of the theory, we provide the first combinatorial proof of the symmetries in the parameters of the Askey--Wilson polynomials.
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Combinatorics of generalized orthogonal polynomials of type $R_{II}$
Generalized type R_II orthogonal polynomials have moments and dual coefficients that are weighted sums over RII lattice paths, unifying previous path models.
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