Perturbation method for linear difference equations with small parameters
Advances in Difference Equations volume 2006, Article number: 019214 (2006)
We consider a boundary value problem for a linear difference equation with several widely different coefficients. We study the existence and uniqueness of its solution and we give successive asymptotic approximations for this solution, obtained by a simple iterative method. This method improves the singular perturbation method, it offers considerable reduction and simplicity in computation since it does not require to compute boundary layer correction solutions.
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Zerizer, T. Perturbation method for linear difference equations with small parameters. Adv Differ Equ 2006, 019214 (2006). https://doi.org/10.1155/ADE/2006/19214