根轨迹的分离点与分离角：两条或两条以上根轨迹分支在\(s\)平面上相遇又立即分开的点，称为根轨迹的分离点，分离点的坐标\(d\)是下列方程的解：
\(\displaystyle\sum_{j=1}^m \frac{1}{d-z_j}=\sum_{i=1}^n \frac{1}{d-p_i}\)
式中，\(z_j\)为各开环零点的数值；\(p_i\)为各开环极点的数值；分离角为\(\displaystyle\frac{(2k+1)\pi}{n-m}\).
| status | not read | reprioritisations | ||
|---|---|---|---|---|
| last reprioritisation on | suggested re-reading day | |||
| started reading on | finished reading on |