Abstract
In this paper, we use the asymptotic expansions of the binomial coefficients and the weights of the L1 approximation to obtain approximations of order \(2-\alpha \) and second-order approximations of the Caputo derivative by modifying the weights of the shifted Grünwald–Letnikov difference approximation and the L1 approximation of the Caputo derivative. A modification of the shifted Grünwald–Letnikov approximation is obtained which allows second-order numerical solutions of fractional differential equations with arbitrary values of the solutions and their first derivatives at the initial point.
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Acknowledgements
The third author is supported by the Bulgarian Academy of Sciences through the Program for Career Development of Young Scientists, Grant DFNP-17-88/28.07.2017, Project Efficient Numerical Methods with an Improved Rate of Convergence for Applied Computational Problems, by the Bulgarian National Fund of Science under Project DN 12/5-2017, Project Efficient Stochastic Methods and Algorithms for Large-Scale Problems, and Project DN 12/4-2017, Project Advanced Analytical and Numerical Methods for Nonlinear Differential Equations with Applications in Finance and Environmental Pollution.
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Communicated by José Tenreiro Machado.
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Dimitrov, Y., Miryanov, R. & Todorov, V. Asymptotic expansions and approximations for the Caputo derivative. Comp. Appl. Math. 37, 5476–5499 (2018). https://doi.org/10.1007/s40314-018-0641-3
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DOI: https://doi.org/10.1007/s40314-018-0641-3