Perturbation of the spectrum οf an essentially selfadjoint operator
Volume 22 / 1993
Applicationes Mathematicae 22 (1993), 75-89
DOI: 10.4064/am-22-1-75-89
Abstract
The aim of this paper is to find estimates of the Hausdorff distance between the spectra of two nonselfadjoint operators. The operators considered are assumed to have their imaginary parts in some normed ideal of compact operators. In the case of the classical Schatten ideals the estimates are given explicitly.
