19 citations · 43 across the 7 of their papers we have counts for
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math.FA2016★ 18 cited
Exact and Positive Controllability of Boundary Control Systems
Klaus-Jochen Engel, Marjeta Kramar Fijavž
Using the semigroup approach to abstract boundary control problems we characterize the space of all exactly reachable states. Moreover, we study the situation when the controls of…
math.SP2016
Spectral theory for structured perturbations of linear operators
Martin Adler, Klaus-Jochen Engel
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…