Unix: replace every odd | with \left| and every even | with \right|
- by HH
An enormous equation. You need to add \left| on the left side of corresponding |. The corresponding | you need to replace with \right|.
Equation
\begin{equation}
| \Delta w_{0} | = \frac{|w_{0}|}{2} \left( |\frac{\Delta g}{g}|+|\frac{\Delta (\Delta r)}{\Delta r}| + |\frac{\Delta r}{r}| +|\frac{\Delta L}{L}| \right)
\end{equation}