deletions | additions       diff --git a/special rel.tex b/special rel.tex  index 21cac0d..9c36011 100644  --- a/special rel.tex  +++ b/special rel.tex 
...
\begin{equation}  \begin{split}  l' = \frac{l}{\gamma} \\  \Delta x' = \gamma (\Delta x - v \Delta t) \\  \Delta t' = \gamma (\Delta t - x \Delta x)  \end{split}  \end{equation}