This book started its life as a series of lectures given by the second
author from the 1970's onwards to students in their third and fourth
years in the Department of Mechanics and Mathematics at Rostov State
University. For these lectures there was also an audience of engineers
and applied mechanicists who wished to understand the functional
analysis used in contemporary research in their fields. These people
were not so much interested in functional analysis itself as in its
applications; they did not want to be told about functional analysis in
its most abstract form, but wanted a guided tour through those parts of
the analysis needed for their applications. The lecture notes evolved
over the years as the first author started to make more formal
typewritten versions incorporating new material. About 1990 the first
author prepared an English version and submitted it to Kluwer Academic
Publishers for inclusion in the series Solid Mechanics and its
Applications. At that state the notes were divided into three long
chapters covering linear and nonlinear analysis. As Series Editor, the
third author started to edit them. The requirements of lecture notes and
books are vastly different. A book has to be complete (in some sense),
self contained, and able to be read without the help of an instructor.