Bispectral commuting difference operators for multivariable Askey-Wilson polynomials

Details Bispectral commuting difference operators for multivariable Askey-Wilson polynomials Bispectral commuting difference operators for multivariable Askey-Wilson polynomials

2008-01-31

arxiv.org/abs/0801.4939v3

Trans. Amer. Math. Soc. 363 (2011), no. 3, 1577--1598

Mathematics

Classical Analysis and ODEs

Scientific paper

We construct a commutative algebra A_z, generated by d algebraically independent q-difference operators acting on variables z_1, z_2,..., z_d, which is diagonalized by the multivariable Askey-Wilson polynomials P_n(z) considered by Gasper and Rahman [6]. Iterating Sears' transformation formula, we show that the polynomials P_n(z) possess a certain duality between z and n. Analytic continuation allows us to obtain another commutative algebra A_n, generated by d algebraically independent difference operators acting on the discrete variables n_1, n_2,..., n_d, which is also diagonalized by P_n(z). This leads to a multivariable q-Askey-scheme of bispectral orthogonal polynomials which parallels the theory of symmetric functions.

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