2 papers
math.FA2015
Perturbation of Analytic Semigroups and Applications to Partial Differential Equations
Martin Adler, Miriam Bombieri, Klaus-Jochen Engel
In a recent paper we presented a general perturbation result for generators of -semigroups. The aim of the present paper is to replace, in case the unperturbed semigroup is an…
math.FA2013
A semigroup characterization of well-posed linear control systems
Miriam Bombieri, Klaus-Jochen Engel
We study the well-posedness of a linear control system with unbounded control and observation operators. To this end we associate to our system an operator matrix $\ma…