An Extension of the Euler-Maclaurin Summation Formula to Nearly Singular Functions
<|reference_start|>An Extension of the Euler-Maclaurin Summation Formula to Nearly Singular Functions: 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.<|reference_end|>
@article{wu2024an,
    title={An Extension of the Euler-Maclaurin Summation Formula to Nearly Singular
  Functions},
    author={Bowei Wu},
    journal={arXiv preprint arXiv:2409.19192},
    year={2024},
    archivePrefix={arXiv},
    eprint={2409.19192},
    primaryClass={math.NA cs.NA}
}