A new approach to the theory of classical hypergeometric polynomials

Details A new approach to the theory of classical hypergeometric polynomials A new approach to the theory of classical hypergeometric polynomials

2003-12-11

arxiv.org/abs/math/0312247v3

Mathematics

Combinatorics

32 pages. To appear in Trans. Amer. Math. Soc

Scientific paper

In this paper we present a unified approach to the spectral analysis of an hypergeometric type operator whose eigenfunctions include the classical orthogonal polynomials. We write the eigenfunctions of this operator by means of a new Taylor formula for operators of Askey-Wilson type. This gives rise to some expressions for the eigenfunctions, which are unknown in such a general setting. Our methods also give a general Rodrigues formula from which several well known formulas of Rodrigues type can be obtained directly. Moreover, other new Rodrigues type formulas come out when seeking for regular solutions of the associated functional equations. The main difference here is that, in contrast with the formulas appearing in the literature, we get non-ramified solutions which are useful for applications in combinatorics. Another fact, that becomes clear in this paper, is the role played by the theory of elliptic functions in the connection between ramified and non-ramified solutions.

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