Bøger af J.D. Cole

This book is a revised and updated version, including a substantial portion of new material, of our text Perturbation Methods in Applied Mathematics (Springer Verlag, 1981).

The basic ideas, however, are also applicable to integral equations, integrodifferential equations, and even to_difference equations.

The aim of this book is to provide a systematic and practical account of methods of integration of ordinary and partial differential equations based on invariance under continuous (Lie) groups of trans formations.