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Noise Effects on Pade Approximants and Conformal Maps

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arxiv 2208.02410 v1 pith:S5XWUKWU submitted 2022-08-04 math-ph cond-mat.stat-mechhep-phhep-thmath.MP

classification math-phcond-mat.stat-mechhep-phhep-thmath.MP
keywords conformalnoisepadeapproximantsexpansionfunctionsrelevantanalyze
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We analyze the properties of Pade and conformal map approximants for functions with branch points, in the situation where the expansion coefficients are only known with finite precision or are subject to noise. We prove that there is a universal scaling relation between the strength of the noise and the expansion order at which Pade or the conformal map breaks down. We illustrate this behavior with some physically relevant model test functions and with two non-trivial physical examples where the relevant Riemann surface has complicated structure

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Analytically Consistent Reconstruction of Finite Data Using Pad\'e Sequences

    physics.data-an 2026-08 conditional novelty 6.0 of 10

    Tracking how spurious pole-zero pairs move across Padé approximation orders lets an iterative algorithm flag inconsistent data points and reconstruct the underlying function while preserving genuine analytic structures.

  2. A remark on Chebyshev rational functions, multipoint Pad\'e approximants and Noise

    math.CA 2026-06 conditional novelty 6.0 of 10

    Chebyshev rational functions with prescribed poles are shown to be explicit multipoint Padé approximants to 1/sqrt(x^2-1), with recurrences, convergence proofs, and noise-breakdown numerics.

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