Hankel operators are of wide application in mathematics (functional
analysis, operator theory, approximation theory) and engineering
(control theory, systems analysis) and this account of them is both
elementary and rigorous. The book is based on graduate lectures given to
an audience of mathematicians and control engineers, but to make it
reasonably self-contained, the author has included several appendices on
mathematical topics unlikely to be met by undergraduate engineers. The
main prerequisites are basic complex analysis and some functional
analysis, but the presentation is kept straightforward, avoiding
unnecessary technicalities so that the fundamental results and their
applications are evident. Some 45 exercises are included.