A Lie-theoretic interpretation of multivariate hypergeometric polynomials
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Publication:2894213
DOI10.1112/S0010437X11007421zbMATH Open1248.33028arXiv1101.1683MaRDI QIDQ2894213
Author name not available (Why is that?)
Publication date: 29 June 2012
Published in: (Search for Journal in Brave)
Abstract: In 1971 Griffiths used a generating function to define polynomials in d variables orthogonal with respect to the multinomial distribution. The polynomials possess a duality between the discrete variables and the degree indices. In 2004 Mizukawa and Tanaka related these polynomials to character algebras and the Gelfand hypergeometric series. Using this approach they clarified the duality and obtained a new proof of the orthogonality. In the present paper, we interpret these polynomials within the context of the Lie algebra sl_{d+1}. Our approach yields yet another proof of the orthogonality. It also shows that the polynomials satisfy d independent recurrence relations each involving d^2+d+1 terms. This combined with the duality establishes their bispectrality. We illustrate our results with several explicit examples.
Full work available at URL: https://arxiv.org/abs/1101.1683
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