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Ratio asymptotics of Hermite-Padé polynomials for Nikishin systems

Ratio asymptotics of Hermite-Padé polynomials for Nikishin systems

We prove the existence of ratio asymptotic for a sequence of multiple orthogonal polynomials which share orthogonality relations with a collection of m finite Borel measures supported on a bounded interval of the real line and constitute a so called Nikishin system of measures.When m = 1 our result reduces …