Terwilliger, P.
(Symmetry, Integrability and Geometry: Methods and Applications, 2011)
In 1992 A. Zhedanov introduced the Askey-Wilson algebra AW=AW(3) and used it to describe the Askey-Wilson polynomials. In this paper we introduce a central extension Δ of AW, obtained from AW by reinterpreting certain ...