Nikishin Systems Are Perfect |
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Authors: | U Fidalgo?Prieto G L��pez?Lagomasino |
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Institution: | 1. Departamento de Matem??ticas, Universidad Carlos III de Madrid, c/ Universidad 30, 28911, Legan??s, Spain
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Abstract: | K. Mahler introduced the concept of perfect systems in the general theory he developed for the simultaneous Hermite–Padé approximation
of analytic functions. We prove that Nikishin systems are perfect, providing by far the largest class of systems of functions
for which this important property holds. As consequences, in the context of Nikishin systems, we obtain: an extension of Markov’s
theorem to simultaneous Hermite–Padé approximation, a general result on the convergence of simultaneous quadrature rules of
Gauss–Jacobi type, the logarithmic asymptotics of general sequences of multiple orthogonal polynomials, and an extension of
the Denisov–Rakhmanov theorem for the ratio asymptotics of mixed type multiple orthogonal polynomials. |
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