

The present lectures intend to provide an introduction to the spectral analysis of self-adjoint operators within the framework of Hilbert space theory. The guiding notion in this approach is that of spectral representation. At the same time the notion of function of an operator...


The Spectral Theory of Operators in Hilbert Space by Kurt Otto Friedrichs is a comprehensive guide to the mathematical theory of linear operators in Hilbert spaces. The book covers a wide range of topics, including the spectral theorem for bounded self-adjoint operators, the...