Canonical systems occupy a central position in the spectral theory of second order differential operators. They may be used to realize arbitrary spectral data,

Theorems of factorising matrix functions and the operator identity method play an essential role in this book in constructing the spectral theory (direct and in

Canonical systems occupy a central position in the spectral theory of second order differential operators. They may be used to realize arbitrary spectral data,

This book treats some basic topics in the spectral theory of dynamical systems, where by a dynamical system we mean a measure space on which a group of automorp

The central topic of this book is the spectral theory of bounded and unbounded self-adjoint operators on Hilbert spaces. After introducing the necessary prerequ