In this paper the optimal distribution of closed loop poles relating to the quadratic performance index is designed by means of the root locus technique.

本文采用了根轨迹技术按二次型性能指标来设计最优的闭环极点分布。

youdao

He was trying to describe electrons, but the theory said there are two roots in the quadratic equation and the second root is mathematically as interesting as the first one.

他当时只是想去描述电子,但是数学理论告诉我们,二次方程有两个根,而第二个根在数学上和第一个根一样有趣

耶鲁公开课 - 基础物理课程节选