In mathematics, the dual q-Hahn polynomials are a family of basic hypergeometric orthogonal polynomials in the basic Askey scheme. Roelof Koekoek, Peter A. Lesky, and René F. Swarttouw (2010, 14) give a detailed list of their properties.
Definition The polynomials are given in terms of basic hypergeometric functions.
R n ( q − x + γ δ q x + 1 , γ , δ , N | q ) =
3 ϕ 2 [ q − n , q − x , γ δ q x + 1 γ q , q − N ; q , q ] , n = 0 , 1 , 2 , . . . , N {\displaystyle R_{n}(q^{-x}+\gamma \delta q^{x+1},\gamma ,\delta ,N|q)={}_{3}\phi _{2}\left[{\begin{matrix}q^{-n},q^{-x},\gamma \delta q^{x+1}\\\gamma q,q^{-N}\end{matrix}};q,q\right],\quad n=0,1,2,...,N}
References Gasper, George; Rahman, Mizan (2004), Basic hypergeometric series, Encyclopedia of Mathematics and its Applications, vol. 96 (2nd ed.), Cambridge University Press, ISBN 978-0-521-83357-8, MR 2128719 Koekoek, Roelof; Lesky, Peter A.; Swarttouw, René F. (2010), Hypergeometric orthogonal polynomials and their q-analogues, Springer Monographs in Mathematics, Berlin, New York: Springer-Verlag, doi:10.1007/978-3-642-05014-5, ISBN 978-3-642-05013-8, MR 2656096 Koornwinder, Tom H.; Wong, Roderick S. C.; Koekoek, Roelof; Swarttouw, René F. (2010), "Chapter 18 Orthogonal Polynomials", in Olver, Frank W. J.; Lozier, Daniel M.; Boisvert, Ronald F.; Clark, Charles W. (eds.), NIST Handbook of Mathematical Functions, Cambridge University Press, ISBN 978-0-521-19225-5, MR 2723248. Costas-Santos, R.S.; Sánchez-Lara, J.F. (September 2011). "Orthogonality of q-polynomials for non-standard parameters". Journal of Approximation Theory. 163 (9): 1246–1268. arXiv:1002.4657. doi:10.1016/j.jat.2011.04.005. S2CID 115178147. Sadjang, Patrick Njionou. Moments of Classical Orthogonal Polynomials (Ph.D.). Universität Kassel. CiteSeerX 10.1.1.643.3896. {{cite thesis}}: Cite uses deprecated parameter |citeseerx= (help)