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A Lie-theoretic interpretation of multivariate hypergeometric polynomials
- Part of
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- Journal:
- Compositio Mathematica / Volume 148 / Issue 3 / May 2012
- Published online by Cambridge University Press:
- 20 March 2012, pp. 991-1002
- Print publication:
- May 2012
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- Article
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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
. Our approach yields yet another proof of the orthogonality. It also shows that the polynomials satisfy d independent recurrence relations each involving d2+d+1 terms. This, combined with the duality, establishes their bispectrality. We illustrate our results with several explicit examples.
. Our approach yields yet another proof of the orthogonality. It also shows that the polynomials satisfy 