5,236 research outputs found

    Nuttall's theorem with analytic weights on algebraic S-contours

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    Given a function ff holomorphic at infinity, the nn-th diagonal Pad\'e approximant to ff, denoted by [n/n]f[n/n]_f, is a rational function of type (n,n)(n,n) that has the highest order of contact with ff at infinity. Nuttall's theorem provides an asymptotic formula for the error of approximation f[n/n]ff-[n/n]_f in the case where ff is the Cauchy integral of a smooth density with respect to the arcsine distribution on [-1,1]. In this note, Nuttall's theorem is extended to Cauchy integrals of analytic densities on the so-called algebraic S-contours (in the sense of Nuttall and Stahl)

    Symmetric Contours and Convergent Interpolation

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    The essence of Stahl-Gonchar-Rakhmanov theory of symmetric contours as applied to the multipoint Pad\'e approximants is the fact that given a germ of an algebraic function and a sequence of rational interpolants with free poles of the germ, if there exists a contour that is "symmetric" with respect to the interpolation scheme, does not separate the plane, and in the complement of which the germ has a single-valued continuation with non-identically zero jump across the contour, then the interpolants converge to that continuation in logarithmic capacity in the complement of the contour. The existence of such a contour is not guaranteed. In this work we do construct a class of pairs interpolation scheme/symmetric contour with the help of hyperelliptic Riemann surfaces (following the ideas of Nuttall \& Singh and Baratchart \& the author. We consider rational interpolants with free poles of Cauchy transforms of non-vanishing complex densities on such contours under mild smoothness assumptions on the density. We utilize ˉ \bar\partial -extension of the Riemann-Hilbert technique to obtain formulae of strong asymptotics for the error of interpolation

    Strong Asymptotics of Hermite-Pad\'e Approximants for Angelesco Systems

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    In this work type II Hermite-Pad\'e approximants for a vector of Cauchy transforms of smooth Jacobi-type densities are considered. It is assumed that densities are supported on mutually disjoint intervals (an Angelesco system with complex weights). The formulae of strong asymptotics are derived for any ray sequence of multi-indices.Comment: 40 page

    Characteristic classes of mixed Hodge modules and applications

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    Twisted Alexander invariants of complex hypersurface complements

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    Twisted genera of symmetric products

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    Characteristic classes of singular toric varieties

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    Spectral pairs, Alexander modules, and boundary manifolds

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