For the past 25 years the theory of pseudodifferential operators has
played an important role in many exciting and deep investigations into
linear PDE. Over the past decade, this tool has also begun to yield
interesting results in nonlinear PDE. This book is devoted to a summary
and reconsideration of some used of pseudodifferential operator
techniques in nonlinear PDE. The book should be of interest to graduate
students, instructors, and researchers interested in partial
differential equations, nonlinear analysis in classical mathematical
physics and differential geometry, and in harmonic analysis.