We study about the approximate controllability of an abstract semilinearcontrolsystem. By introducing a new sufficient condition, we proved the approximate controllability of the system.
讨论一类抽象半线性控制系统，引入新的充分条件，并证明该系统的近似可控制性。
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This paper discusses the problem of the optimal harvesting control problem for a semilinear age-dependent population diffusion system.