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Approximate controllability of semilinear functional equations in Hilbert spaces. (English) Zbl 1017.93019
Approximate and complete controllability for semilinear functional differential systems in Hilbert spaces is studied. Sufficient conditions are established for each of these types of controllability. The results address the limitation that linear systems in infinite-dimensional spaces with compact semigroup cannot be completely controllable. The conditions are obtained by using the Schauder fixed point theorem when the semigroup is compact and the Banach fixed point theorem when the semigroup is not compact.

MSC:
93B05Controllability
93C25Control systems in abstract spaces
93C30Control systems governed by other functional relations
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References:
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