Under the worst disturbance and the optimal control, the finite eigenvalues of the closed-loop system are located on the open left-half complex plane and the state of the closed-loop system has the least free entries. 在最坏干扰和最优控制作用下,所得闭环系统的任意有限特征值均在开左半复平面,且闭环系统的状态有最少自由元。