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$f(t)$ 做拉普拉斯变换，可以将其从实数域（

$t$ ）转换到复数域（

$s$ ），它的定义为

$\displaystyle {\mathcal {L}}[f(t)]=F(s)=\int _{0}^{\infty }f(t)e^{-st}\,\mathrm {d} t$ 其中，

$s=\sigma +i\omega$ ，

$\sigma$ 和

$\omega$ 为实数 - 积分下限从0开始，从控制工程的角度来讲，不需要去研究时间0点之前的事情，而是把这部分留给哲学家

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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