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Orthogonal polynomials, duality and association schemes. (English) Zbl 0495.33006

MSC:
33C45 Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.)
42C05 Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis
05E30 Association schemes, strongly regular graphs
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