Lardyʹs regularization of a singularly perturbed elliptic PDE

In this paper, we consider an elliptic partial differential equation where a small parameter is multiplied with one or both of the second derivatives. Viewing it as an ill-posed problem, Lardyʹs regularization method is applied to approximate the solution. Convergence of the regularized solution to the original is proved. Numerical examples have been included for illustrating the method.