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Applications of the monotonicity of extremal zeros of orthogonal polynomials in interlacing and optimization problems. (English) Zbl 1210.33015
Summary: We investigate monotonicity properties of extremal zeros of orthogonal polynomials depending on a parameter. Using a functional analysis method we prove the monotonicity of extreme zeros of associated Jacobi, associated Gegenbauer and $$q$$-Meixner-Pollaczek polynomials. We show how these results can be applied to prove interlacing of zeros of orthogonal polynomials with shifted parameters and to determine optimally localized polynomials on the unit ball.

##### MSC:
 33C45 Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.) 33C50 Orthogonal polynomials and functions in several variables expressible in terms of special functions in one variable
OPQ
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