In the modern study of Hilbert space operators there has been an
increasingly subtle involvement with analytic function theory. This is
evident in the analysis of subnormal operators, Toeplitz operators and
Hankel operators, for example. On the other hand the operator theoretic
viewpoint of interpolation by analytic functions is a powerful one.
There has been significant activity in recent years, within these
enriching interactions, and the time seemed right for an overview ot the
main lines of development. The Advanced Study Institute 'Operators and
Function Theory' in Lancaster, 1984, was devoted to this, and this book
contains ex- panded versions (and one contraction) of the main lecture
prog- ramme. These varied articles, by prominent researchers, include,
for example, a survey of recent results on subnormal operators, recent
work of Soviet mathematicians on Hankel and Toeplitz operators,
expositions of the decomposition theory and inter- polation theory for
Bergman, Besov and Bloch spaces, with applic- ations for special
operators, the Krein space approach to inter- polation problems, -- and
much more. It is hoped that these proceedings will bring all this lively
mathematics to a wider audience. Sincere thanks are due to the
Scientific Committee of the North Atlantic Treaty Organisation for the
generous support that made the institute possible, and to the London
Mathematical Society and the British Council for important additional
support. Warm thanks also go to Barry Johnson and the L.M.S. for early
guidance, and to my colleague Graham Jameson for much organisational
support.