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- W2950968167 abstract "A unified fast time-stepping method for both fractional integral and derivative operators is proposed. The fractional operator is decomposed into a local part with memory length $Delta T$ and a history part, where the local part is approximated by the direct convolution method and the history part is approximated by a fast memory-saving method. The fast method has $O(n_0+sum_{ell}^L{q}_{alpha}(N_{ell}))$ active memory and $O(n_0n_T+ (n_T-n_0)sum_{ell}^L{q}_{alpha}(N_{ell}))$ operations, where $L=log(n_T-n_0)$, $n_0={Delta T}/tau,n_T=T/tau$, $tau$ is the stepsize, $T$ is the final time, and ${q}_{alpha}{(N_{ell})}$ is the number of quadrature points used in the truncated Laguerre--Gauss (LG) quadrature. The error bound of the present fast method is analyzed. It is shown that the error from the truncated LG quadrature is independent of the stepsize, and can be made arbitrarily small by choosing suitable parameters that are given explicitly. Numerical examples are presented to verify the effectiveness of the current fast method." @default.
- W2950968167 created "2019-06-27" @default.
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- W2950968167 date "2017-03-16" @default.
- W2950968167 modified "2023-09-25" @default.
- W2950968167 title "A stable fast time-stepping method for fractional integral and derivative operators" @default.
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- W2950968167 doi "https://doi.org/10.48550/arxiv.1703.05480" @default.
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