This largely self-contained treatment surveys, unites and extends
some 20 years of research on direct and inverse problems for
canonical systems of integral and differential equations and
related systems. Five basic inverse problems are studied in which
the main part of the given data is either a monodromy matrix; an
input scattering matrix; an input impedance matrix; a matrix valued
spectral function; or an asymptotic scattering matrix. The
corresponding direct problems are also treated. The book
incorporates introductions to the theory of matrix valued entire
functions, reproducing kernel Hilbert spaces of vector valued
entire functions (with special attention to two important spaces
introduced by L. de Branges), the theory of J-inner matrix valued
functions and their application to bitangential interpolation and
extension problems, which can be used independently for courses and
seminars in analysis or for self-study. A number of examples are
presented to illustrate the theory.
General
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