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根轨迹绘制基本法则·法则三
根轨迹的渐近线：当开环有限极点数

$n$ 大于有限零点数

$m$ 时，有

$n-m$ 条根轨迹分支沿着与实轴交角为

$\varphi_a$ 、交点为

$\sigma_a$ 的一组渐近线趋向无穷远处，且有

$\displaystyle\varphi_u=\frac{(2 k+1) \pi}{n-m} ; \quad k=0,1,2, \cdots, n-m-1$ 和

$\sigma_a=\frac{\displaystyle\sum_{i=1}^n p_i-\sum_{j=1}^m z_j}{n-m}$

status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

No repetitions

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