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- W2162279400 abstract "A new class of fitted operator finite difference methods are constructed via non-standard finite difference methods ((NSFDM)s) for the numerical solution of singularly perturbed differential difference equations having both delay and advance arguments. The main idea behind the construction of our method(s) is to replace the denominator function of the classical second-order derivative with a positive function derived systematically in such a way that it captures significant properties of the governing differential equation and thus provides the reliable numerical results. Unlike other FOFDMs constructed in standard ways, the methods that we present in this paper are fairly simple to construct (and thus enrich the class of fitted operator methods by adding these new methods). These methods are shown to be ε-uniformly convergent with order two which is the highest possible order of convergence obtained via any fitted operator method for the problems under consideration. This paper further clarifies several doubts, e.g. why a particular scheme is not suitable for the whole range of values of the associated parameters and what could be the possible remedies. Finally, we provide some numerical examples which illustrate the theoretical findings. Copyright © 2005 John Wiley & Sons, Ltd." @default.
- W2162279400 created "2016-06-24" @default.
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- W2162279400 date "2006-01-01" @default.
- W2162279400 modified "2023-10-01" @default.
- W2162279400 title "Uniformly convergent non-standard finite difference methods for singularly perturbed differential-difference equations with delay and advance" @default.
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- W2162279400 doi "https://doi.org/10.1002/nme.1555" @default.
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