The understanding of results and notions for a student in mathematics
requires solving ex- ercises. The exercises are also meant to test the
reader's understanding of the text material, and to enhance the skill in
doing calculations. This book is written with these three things in
mind. It is a collection of more than 450 exercises in Functional
Analysis, meant to help a student understand much better the basic facts
which are usually presented in an introductory course in Functional
Analysis. Another goal of this book is to help the reader to understand
the richness of ideas and techniques which Functional Analysis offers,
by providing various exercises, from different topics, from simple ones
to, perhaps, more difficult ones. We also hope that some of the
exercises herein can be of some help to the teacher of Functional
Analysis as seminar tools, and to anyone who is interested in seeing
some applications of Functional Analysis. To what extent we have managed
to achieve these goals is for the reader to decide.