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Reference.org
Askey scheme
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<p> In mathematics, the Askey scheme is a way of organizing <a href="/facts/Orthogonal_polynomials/9cyRbDYU">orthogonal polynomials</a> of hypergeometric or basic hypergeometric type into a hierarchy. For the classical orthogonal polynomials discussed in Andrews & Askey (1985), the Askey scheme was first drawn by Labelle (1985) and by <a href="/facts/Richard_Askey/r6ScCdJa">Askey</a> and Wilson (1985), and has since been extended by Koekoek & Swarttouw (1998) and Koekoek, Lesky & Swarttouw (2010) to cover basic orthogonal polynomials. </p>