"This is an excellent monograph on the applications of functional analytic methods in partial differential equations. Written by a recognized international expert, the book will be of great interest to mathematical analysts, physicists as well as graduate and postgraduate level students in the field. "---Zentrallblatt fur Mathematik"Due to the large area of tackled problems and to the clear and detailed proofs, this monograph is interesting and accessible both to specialists and to graduate students."---Rev. Roumaine Math. Pures Appl., 2000