Bilinear generating functions for orthogonal polynomials

Details Bilinear generating functions for orthogonal polynomials Bilinear generating functions for orthogonal polynomials

1997-04-24

arxiv.org/abs/q-alg/9704016v1

Mathematics

Quantum Algebra

18 pages, LaTeX

Scientific paper

Using realisations of the positive discrete series representations of the Lie algebra su(1,1) in terms of Meixner-Pollaczek polynomials, the action of su(1,1) on Poisson kernels of these polynomials is considered. In the tensor product of two such representations, two sets of eigenfunctions of a certain operator can be considered and they are shown to be related through continuous Hahn polynomials. As a result, a bilinear generating function for continuous Hahn polynomials is obtained involving the Poisson kernel of Meixner-Pollaczek polynomials. For the positive discrete series representations of the quantised universal enveloping algebra Uq(su(1,1)) a similar analysis is performed and leads to a bilinear generating function for Askey-Wilson polynomials involving the Poisson kernel of Al-Salam and Chihara polynomials.

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