The main change in this edition is the inclusion of exercises with
answers and hints. This is meant to emphasize that this volume has been
written as a general course in modern analysis on a graduate student
level and not only as the beginning of a specialized course in partial
differen- tial equations. In particular, it could also serve as an
introduction to harmonic analysis. Exercises are given primarily to the
sections of gen- eral interest; there are none to the last two chapters.
Most of the exercises are just routine problems meant to give some
familiarity with standard use of the tools introduced in the text.
Others are extensions of the theory presented there. As a rule rather
complete though brief solutions are then given in the answers and hints.
To a large extent the exercises have been taken over from courses or
examinations given by Anders Melin or myself at the University of Lund.
I am grateful to Anders Melin for letting me use the problems
originating from him and for numerous valuable comments on this
collection. As in the revised printing of Volume II, a number of minor
flaws have also been corrected in this edition. Many of these have been
called to my attention by the Russian translators of the first edition,
and I wish to thank them for our excellent collaboration.