Abstract
We study the general (composite) Newton–Cotes rules for the computation of Hadamard finite-part integral on a circle with the hypersingular kernel \({\sin^{-2}\frac{x-s}2 }\) and focus on their pointwise superconvergence phenomenon, i.e., when the singular point coincides with some a priori known point, the convergence rate is higher than what is globally possible. We show that the superconvergence rate of the (composite) Newton–Cotes rules occurs at the zeros of a special function \({\Phi_k(\tau)}\) and prove the existence of the superconvergence points. The relation between \({\Phi_k(\tau)}\) and \({\mathcal{S}_k(\tau)}\) defined in Wu and Sun (Numer Math 109:143–165, 2008) is established, and the efficient calculation of Cotes coefficients is also discussed. Several numerical examples are provided to validate the theoretical analysis.
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Communicated by W. Hackbusch.
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Zhang, X., Wu, J. & Yu, D. The superconvergence of composite Newton–Cotes rules for Hadamard finite-part integral on a circle. Computing 85, 219–244 (2009). https://doi.org/10.1007/s00607-009-0048-5
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DOI: https://doi.org/10.1007/s00607-009-0048-5