A Note on the Rate of Convergence of Poles of Generalized Hermite-Pade Approximants

Nattapong Bosuwan


We consider row sequences of three generalized Hermite-Pade approximations (orthogonal Hermite-Pade approximation, Hermite-Pade-Faber approximation, and multipoint Hermite-Pade approximation) of a vector of the approximated functions F and prove that if F has a system pole of order ν, then such system pole attracts at least ν zeros of denominators of these approximants at the rate of a geometric progression. Moreover, the rates of these attractions are estimated.

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|ISSN 1686-0209|