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- W2890413134 abstract "An explicit form for coefficients of shifted Grünwald type approximations of fractional derivatives is presented. This form directly gives approximations for any order of accuracy with any desired shift leading to efficient and automatic computations of the coefficients. To achieve this, we consider generating functions in the form of power of a polynomial. Then, an equivalent characterization for consistency and order of accuracy established on a general generating function is used to form a linear system of equations with Vandermonde matrix. This linear system is solved for the coefficients of the polynomial in the generating function. These generating functions completely characterize Grünwald type approximations with shifts and order of accuracy. Incidentally, the constructed generating functions happen to be a generalization of the previously known Lubich forms of generating functions without shift. We also present a formula to compute leading and some successive error terms from the coefficients. We further show that finite difference formulas for integer-order derivatives with desired shift and order of accuracy are some special cases of our explicit form." @default.
- W2890413134 created "2018-09-27" @default.
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- W2890413134 date "2019-09-01" @default.
- W2890413134 modified "2023-10-01" @default.
- W2890413134 title "An explicit form for higher order approximations of fractional derivatives" @default.
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- W2890413134 doi "https://doi.org/10.1016/j.apnum.2019.03.017" @default.
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