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KIAM Preprint № 85, Moscow, 2017
Authors: Lysov V. G.
Strong asymptotics of Hermite-Pade approximants for the Nikishin system of Jacobi weights
Abstract:
The Hermite-Pade approximants for the Cauchy transforms of the Jacobi weights on one interval are considered. This system of functions forms a Nikishin system. The denominators of the approximants are known as Jacobi-Pineiro polynomials. For the case of two weights the integral representations are obtained, the weak asymptotics is investigated. For the diagonal indexes the strong asymptotics of the polynomials and the functions of the second kind is found. The classical saddle point method is used.
Keywords:
Jacobi-Pineiro multiple orthogonal polynomials, Nikishin system, strong asymptotics, integral representations, saddle point method
Publication language: russian,  pages: 35
Research direction:
Mathematical problems and theory of numerical methods
Russian source text:
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About authors:
  • Lysov Vladimir Genrikhovich,  KIAM RAS