Two linear transformations each tridiagonal with respect to an eigenbasis of the other; the TD–D canonical form and the LB–UB canonical form - Terwilliger, Paul (Journal of algebra, 2005)
Keywords: Askey scheme; Askey–Wilson polynomials; Leonard pair; q-Racah polynomials; Tridiagonal pair; Askey scheme; q-Racah polynomials; Leonard pair; Tridiagonal pair; Askey–Wilson polynomials