Asymptotic Analysis From Theory to Application

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Asymptotic Analysis From Theory to Application

Edited by F. Verhulst

Springer-Verlag Berlin Heidelberg New York 1979

Editor Ferdinand Verhulst Mathematisch Instituut Rijksuniversiteit Utrecht NL-3508 TA Utrecht

AMS Subject Classifications (1970): 34015, 34E20, 34C30, 35B25, 70H99,76W05 ISBN 3-540-09245-5 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-09245-5 Springer-Verlag New York Heidelberg Berlin This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to the publisher, the amount of the fee to be determined by agreement with the publisher

© by Springer-Verlag Berlin Heidelberg 1979 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210

PREFACE The composition and writing of these Lecture Notes arose from the realization of two facts. The first one is, that the approach of the fiftieth birthday of W. Eckhaus makes this an appropriate occasion to provide a collection of papers written by a number of mathematicians who were at some stage 'his students'. The papers in this book are dedicated to W. Eckhaus who has been a versatile and influential applied mathematician, working ln the United States of America, ln France and in the Netherlands. He has contributed fundamentally ln the field of non-linear stability theory of partial differential equations, asymptotic analysis and several other branches of applied analysis. The field of asymptotic analysis especially attracted many young mathematicians in the Netherlands with as a result a rapid and varied development of the theory. This leads us to the second fact. Asymptotic analysis arose from now classical theories in celestial mechanics and fluid mechanics. The flourishing of asymptotics during the last ten years, however, took place within the discipline of applied mathematics and there is an understandable lag in the application of these new theories. One expects the subtleties of matching conditions or the estimation theory by Hilbert-space methods to take some time before being applied in the physjcal sciences. The realization of this second fact has provided the main idea behind the writing of most of the papers in this book: to show that asymptotic analysis as a branch of mathematics can be applied to develop new theories in"such varied fields as biology, plasmaphysics, celestial mechanics, Hamiltonian mechanics, the theory of ocean currents etc. It is in this dynamic sense that the contents of the book should reflect the title.

F.

Verhulst

CONTENTS J. Mauss

On matching principles P.P.N. de Groen Singular perturbations of spectra Aart van Harten Feed-back control of singularly perturbed heating problems H.J.K. Moet Singular perturbation methods in a one-dimensional fre