In section 3, we adopt the fixed method to prove the approximate controllability of system (1.1).
第二节我们用传统的变分方法证明了系统(1．1)线性化以后的逼近能控性。
参考来源 - 半线性抛物系统的逼近能控性The problem of exact controllability turns out to be equivalent to the observability of the adjoint system. While approximate controllability is equivalent to a weaker uniqueness or Unique continuation property.
其中，精确能控性等价于其对偶系统的能观性，而近似能控性等价于相应的唯一延拓性质。
参考来源 - 关于波动方程能控性问题的综述·2,447,543篇论文数据，部分数据来源于NoteExpress
We study about the approximate controllability of an abstract semilinear control system. 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。
By the intuitive idea of approximate an infinite dimensional manifold by finite dimensional manifolds, concepts of projected subsystems and project limit controllability are proposed.
根据用有限维流形逼近无穷维流形的思想，提出了投影子系统和投影极限能控性的概念。
In this paper, the approximate perturbation range of the state matrix of a linear time-invariant system is given, keeping the system controllability invariant.
本文给出了线性定常系统状态矩阵摄动时保持能控性不变的摄动区间的估计。
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