We characterize the spectrum (and its parts) of operators which can be represented as "G=A+BC" for a "simpler" operator A and a structured perturbation BC. The interest in this kind of perturbations is motivated, e.g., by perturbations of the domain of an operator A but also arises in the theory of closed-loop systems in control theory. In many cases our results yield the spectral values of G as zeros of a "characteristic equation".
|Titolo:||SPECTRAL THEORY FOR STRUCTURED PERTURBATIONS OF LINEAR OPERATORS|
|Data di pubblicazione:||2018|
|Appare nelle tipologie:||1.1 Articolo in rivista|