Heaviside Expansion Formula

Theorem
Let $P, Q$ be polynomials with coefficients in $\C$.

Let $\deg Q \ge \deg P + 1$.

Let $\map Q z$ have a simple zero for $z \in X$.

Let $\map {\laptrans f} z = \dfrac {\map P z} {\map Q z}$.

Then:


 * $\displaystyle \map f t = \sum_{z \mathop \in X} e^{z t} \frac {\map P z} {\map {Q'} z}$