deletions | additions       diff --git a/kinematics.tex b/kinematics.tex  index 2ea1e40..43f5cc8 100644  --- a/kinematics.tex  +++ b/kinematics.tex 
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Energy-momentum conservation can be expressed by the 4-vector equation:  \begin{equation} \label{eq:energy-momentum}  \mathbf{\pi^{+}} = \mathbf{\mu^{+}} + \mathbf{\nu_{\mu}}  \end{equation}