Szukana fraza: [Abstract = "In the paper, the approximate controllability of semilinear abstract second\-order infinite\-dimensional dynamical systems is considered. It is proved by using the frequency\-domain and functional\-analysis methods that the approximate controllability of second\-order semilinear dynamical system can be verified by the approximate controllability conditions for a simplified suitably\-defined first\-order linear dynamical system."]

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