Al-Salam–Carlitz polynomials

In mathematics, Al-Salam–Carlitz polynomials U(a)
n(x;q) and V(a)
n(x;q) are two families of basic hypergeometric orthogonal polynomials in the basic Askey scheme, introduced by Al-Salam and Carlitz (1965). Roelof Koekoek, Peter A. Lesky, and René F. Swarttouw (2010, 14.24, 14.25) give a detailed list of their properties.

Definition

The Al-Salam–Carlitz polynomials are given in terms of basic hypergeometric functions by

${\displaystyle U_{n}^{(a)}(x;q)=(-a)^{n}q^{n(n-1)/2}{}_{2}\phi _{1}(q^{-n},x^{-1};0;q,qx/a)}$

${\displaystyle V_{n}^{(a)}(x;q)=(-a)^{n}q^{-n(n-1)/2}{}_{2}\phi _{0}(q^{-n},x;;q,q^{n}/a)}$

References

• Al-Salam, W. A.; Carlitz, L. (1965), "Some orthogonal q-polynomials", Mathematische Nachrichten, 30: 47–61, doi:10.1002/mana.19650300105, ISSN 0025-584X, MR 0197804
• 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