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Error bounds for the asymptotic expansions of the Hermite polynomials

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arxiv 2109.01054 v2 pith:TGSMDOYS submitted 2021-09-02 math.CA

Error bounds for the asymptotic expansions of the Hermite polynomials

classification math.CA
keywords errorasymptoticboundsexpansionsbranchhermitepolynomialstechnique
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper, we present explicit and computable error bounds for the asymptotic expansions of the Hermite polynomials with Plancherel--Rotach scale. Three cases, depending on whether the scaled variable lies in the outer or oscillatory interval, or it is the turning point, are considered separately. We introduce the "branch cut" technique to express the error terms as integrals on the contour taken as the one-sided limit of curves approaching the branch cut. This new technique enables us to derive simple error bounds in terms of elementary functions. We also provide recursive procedures for the computation of the coefficients appearing in the asymptotic expansions.

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