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Contiguous relations, continued fractions and orthogonality

Dharma P. Gupta·David R. Masson
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Abstract

We examine a special linear combination of balanced very-well-poised $\tphia$ basic hypergeometric series that is known to satisfy a transformation. We call this $Φ$ and show that it satisfies certain three-term contiguous relations. From two sets of contiguous relations for $Φ$ we obtain fifty-six pairwise linearly independent solutions to a three-term recurrence that generalizes the recurrence for Askey-Wilson polynomials. The associated continued fraction is evaluated using Pincherle's theorem. From this continued fraction we are able to derive a discrete system of biorthogonal rational functions. This ties together Wilson's results for rational biorthogonality, Watson's $q$-analogue of Ramanujan's Entry 40 continued fraction and a conjecture of Askey concerning the latter. Some new $q$-series identities are also obtained. One is an important three-term transformation for $Φ$'s which generalizes all the known two and three-term $\ephis$ transformations. Others are new and unexpected quadratic identities for these very-well-poised $\ephis$'s.

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Dharma P. Gupta, David R. Masson. 1995-11-02. Contiguous relations, continued fractions and orthogonality. https://arxiv.org/abs/math/9511218

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