Preface The analysis of singular perturbed differential equations began early in the twentieth century, when approximate solutions were constructed from asymp-totic expansions. (Preliminary attempts appear in the nineteenth century – see [vD94].) This technique has flourished since the mid-1960s and its principal ideas and methods are described in several… (More)
A collection of typical examples shows the exotic behaviour of numerical methods when applied to singular perturbation problems. While standard meshes are used in the first six examples, even on layer-adapted meshes several surprising phenomena are shown to occur.