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JunningHuang · Nov 15, 2024 · 4674947 · 4674947
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diff --git a/content/Math/Difference Equations and Z transform.md b/content/Math/Difference Equations and Z transform.md
@@ -8,10 +8,11 @@ tags:
 ## Difference Equation and Z Transform
 Let's recall a bit some basic foundations of differential equations and Laplace transform, the simplest linear ODE:
 $$
-\begin{align}
+\begin{aligned}
 \dot{x}=ax+bu
-\end{align}
+\end{aligned}
 $$
+
 Laplace transform is invented to solve such a DE, take the Laplace transform, we have
 $$
 \begin{aligned}