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On non-linear characterizations of classical orthogonal polynomials. (English) Zbl 1524.33059

Summary: Classical orthogonal polynomials are known to satisfy seven equivalent properties, namely the Pearson equation for the linear functional, the second-order differential/difference/\(q\)-differential/ divided-difference equation, the orthogonality of the derivatives, the Rodrigues formula, two types of structure relations, and the Riccati equation for the formal Stieltjes function. In this work, following previous work by K. H. Kwon et al. [J. Difference Equ. Appl. 4, No. 2, 145–162 (1998; Zbl 0933.33011); Kyungpook Math. J. 38, No. 2, 259–281 (1998; Zbl 0922.33005)], we state and prove a non-linear characterization result for classical orthogonal polynomials on non-uniform lattices. Next, we give explicit relations for some families of these classes.

MSC:

33C45 Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.)
33D45 Basic orthogonal polynomials and functions (Askey-Wilson polynomials, etc.)

Software:

OPQ

References:

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