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Counterexamples concerning observation operators for \(C_0\)-semigroups. (English) Zbl 1101.93042

MSC:
93C25 Control/observation systems in abstract spaces
93A05 Axiomatic systems theory
93B07 Observability
47D60 \(C\)-semigroups, regularized semigroups
34G10 Linear differential equations in abstract spaces
47N70 Applications of operator theory in systems, signals, circuits, and control theory
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