From the reviews: "At last! A teachable book on Nonlinear Analysis. Written with the teacher and the student in mind, this book will certainly acquire an important position in everybody's Nonlinear Analysis library." (A.G. Kartsatos, University of South Florida) "This book provides a self-contained and systematic introduction to the mathematical foundations of nonlinear analysis. The authors have written a splendid text. ... Each chapter contains illustrative examples perfectly adjusted to the context. At the end of each chapter there are valuable comments, both historical and bibliographical ... . To sum up, the work is an important addition to a rather meager set of text/reference books on modern nonlinear analysis. ... it was a pleasure to study and review the book." (S. Burys, Zentralblatt MATH, Vol. 1040, 2004)