Lagerstrom P. Fluid Mechanics and Singular Perturbations...1967

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The only publications of Saul Kaplun are the three papers reprinted in this book. Although it has long been recognized that many deep and highly origi­nal ideas are contained in the few pages of these papers, his published work gives a very incomplete picture of his scientific discoveries. The articles in this book are presented essentially the way Saul Kaplun wrote them, although not in the way he himself would have published them. Saul Kaplun developed his ideas about singular perturbations in the course of studying asymptotic solutions of the Navier-Stokes equations, in particular solutions for viscous flow at low Reynolds numbers. As a result, almost all his discussion of asymptotic theory and technique is given in connection with problems of viscous flow