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• W2897844906 abstract "Computationally efficient numerical methods for high-order approximations of convolution integrals involving weakly singular kernels find many practical applications including those in the development of fast quadrature methods for numerical solution of integral equations. Most fast techniques in this direction utilize uniform grid discretizations of the integral that facilitate the use of FFT for $O(nlog n)$ computations on a grid of size $n$. In general, however, the resulting error converges slowly with increasing $n$ when the integrand does not have a smooth periodic extension. Such extensions, in fact, are often discontinuous and, therefore, their approximations by truncated Fourier series suffer from Gibb's oscillations. In this paper, we present and analyze an $O(nlog n)$ scheme, based on a Fourier extension approach for removing such unwanted oscillations, that not only converges with high-order but is also relatively simple to implement. We include a theoretical error analysis as well as a wide variety of numerical experiments to demonstrate its efficacy." @default.
• W2897844906 created "2018-10-26" @default.
• W2897844906 creator A5078700724 @default.
• W2897844906 creator A5086959555 @default.
• W2897844906 date "2018-10-09" @default.
• W2897844906 modified "2023-10-16" @default.
• W2897844906 title "A Fourier extension based numerical integration scheme for fast and high-order approximation of convolutions with weakly singular kernels" @default.
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• W2897844906 hasPublicationYear "2018" @default.
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