Partial Differential Equations (Graduate Studies in Mathematics)

"This is the second edition of the now definitive text on partial differential equations (PDE). It offers a comprehensive survey of modern techniques in the theoretical study of PDE with particular emphasis on nonlinear equations. Its wide scope and clear exposition make it a great text for a graduate course in PDE. For this edition the author has made numerous changes including: a new chapter on nonlinear wave equations more than 80 new exercises several new sections and a significantly expanded bibliography."--Publishers description.