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From the reviews of the earlier editions:An excellent secondreading text. Should be accessible to any mathematician. Highly recommended. The Mathematical GazetteAn excellent text upon which to build and introduction to partial differential equations at the graduate level. In additionrecommended for the nonspecialist. American Mathematical MonthlyPartial Differential Equations is a very well accepted introduction to the subject. In it, the author identifies the significant aspects of the theory and explores them with a limited amount of machinery from mathematical analysis. Now, in this fourth edition, the book has again been updated with an additional chapter on Lewys example of a linear equation with solutions.
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