Abstract
We obtain exact, simple and very compact expressions for the linearization coefficients of the products of orthogonal polynomials; both the conventional Clebsch–Gordan-type and the modified version. The expressions are general depending only on the coefficients of the three-term recursion relation of the linearizing polynomial. These are more appropriate and useful for doing numerical calculations when compared to other exact formulas found in the mathematics literature, some of which are either very complicated, apply only to special class of polynomials, or may involve the evaluation of intractable integrals. As an application in physics, we present a remarkable phenomenon where nonlinear coupling in a physical system with pure continuous spectrum generates discrete bound states.
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