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arXiv · 2409.19192

An Extension of the Euler-Maclaurin Summation Formula to Nearly Singular Functions

Bowei Wu
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Abstract

A extension of the Euler-Maclaurin (E-M) formula to near-singular functions is presented. This extension is derived based on earlier generalized E-M formulas for singular functions. The new E-M formulas consists of two components: a ``singular'' component that is a continuous extension of the earlier singular E-M formulas, and a ``jump'' component associated with the discontinuity of the integral with respect to a parameter that controls near singularity. The singular component of the new E-M formulas is an asymptotic series whose coefficients depend on the Hurwitz zeta function or the digamma function. Numerical examples of near-singular quadrature based on the extended E-M formula are presented, where accuracies of machine precision are achieved insensitive to the strength of the near singularity and with a very small number of quadrature nodes.

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Bowei Wu. 2024-09-28. An Extension of the Euler-Maclaurin Summation Formula to Nearly Singular Functions. https://arxiv.org/abs/2409.19192

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