8 citations · 22 across the 8 of their papers we have counts for
4 papers · 2 filters
Spectral estimates and basis properties for self-adjoint block operator matrices
Michael Strauss
In the first part of this manuscript a relationship between the spectrum of self-adjoint operator matrices and the spectra of their diagonal entries is found. This leads to enclosu…
The Second Order Spectrum and Optimal Convergence
Michael Strauss
The method of second order relative spectra has been shown to reliably approximate the discrete spectrum for a self-adjoint operator. We extend the method to normal operators and f…
Triple Variational Principles for Self-Adjoint Operator Functions
Matthias Langer, Michael Strauss
For a very general class of unbounded self-adjoint operator function we prove upper bounds for eigenvalues which lie within arbitrary gaps of the essential spectrum. These upper bo…
The Galerkin Method for Perturbed Self-Adjoint Operators and Applications
Michael Strauss
We consider the Galerkin method for approximating the spectrum of an operator where is semi-bounded self-adjoint and satisfies a relative compactness condition. We sh…