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