Multipoint Padé approximants to complex Cauchy transforms with polar singularities |
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Authors: | Laurent Baratchart Maxim Yattselev |
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Affiliation: | aINRIA, Project APICS, 2004 route des Lucioles, BP 93, 06902 Sophia-Antipolis, France |
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Abstract: | We study diagonal multipoint Padé approximants to functions of the form where R is a rational function and λ is a complex measure with compact regular support included in , whose argument has bounded variation on the support. Assuming that interpolation sets are such that their normalized counting measures converge sufficiently fast in the weak-star sense to some conjugate-symmetric distribution σ, we show that the counting measures of poles of the approximants converge to , the balayage of σ onto the support of λ, in the weak* sense, that the approximants themselves converge in capacity to F outside the support of λ, and that the poles of R attract at least as many poles of the approximants as their multiplicity and not much more. |
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Keywords: | Padé approximation Rational approximation Orthogonal polynomials Non-Hermitian orthogonality |
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