Structure relations of classical orthogonal polynomials in the quadratic and q-quadratic variable
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Date
Authors
Nangho, Maurice Kenfack
Jordaan, Kerstin Heidrun
Journal Title
Journal ISSN
Volume Title
Publisher
National Academy of Science of Ukraine
Abstract
We prove an equivalence between the existence of the rst structure relation
satis ed by a sequence of monic orthogonal polynomials fPng1n
=0, the orthogonality of the
second derivatives fD2
xPng1n
=2 and a generalized Sturm{Liouville type equation. Our treat-
ment of the generalized Bochner theorem leads to explicit solutions of the di erence equation
[Vinet L., Zhedanov A., J. Comput. Appl. Math. 211 (2008), 45{56], which proves that the
only monic orthogonal polynomials that satisfy the rst structure relation are Wilson poly-
nomials, continuous dual Hahn polynomials, Askey{Wilson polynomials and their special or
limiting cases as one or more parameters tend to 1. This work extends our previous result
[arXiv:1711.03349] concerning a conjecture due to Ismail. We also derive a second structure
relation for polynomials satisfying the rst structure relation.
Description
This paper is a contribution to the Special Issue on Orthogonal Polynomials, Special Functions and Applications
(OPSFA14).
Keywords
Classical orthogonal polynomials, Classical q-orthogonal polynomials, Askey{ Wilson polynomials, Wilson polynomials, Structure relations, Characterization theorems
Sustainable Development Goals
Citation
Kenfack, M. & Jordaan, K. 2018, 'Structure relations of classical
orthogonal polynomials in the quadratic
and q-quadratic variable', Symmetry, Integrability and Geometry: Methods and Applications, vol. 14, art. 126, pp. 1-26.