By Lars Hörmander
From the experiences:
"Volumes III and IV whole L. Hörmander's treatise on linear partial differential equations. They represent the main whole and updated account of this topic, by means of the writer who has ruled it and made the main major contributions within the final decades.....It is an excellent booklet, which needs to be found in each mathematical library, and an critical software for all - old and young - drawn to the idea of partial differential operators." L. Boutet de Monvel in Bulletin of the yank Mathematical Society, 1987.
"This treatise is phenomenal in each recognize and needs to be counted one of the nice books in arithmetic. it truly is definitely no effortless examining (...) yet a cautious learn is intensely profitable for its wealth of principles and methods and the wonderful thing about presentation." J. Brüning in Zentralblatt MATH, 1987.