deletions | additions       diff --git a/kinematics more.tex b/kinematics more.tex  index deb0e1e..b8b0472 100644  --- a/kinematics more.tex  +++ b/kinematics more.tex 
...
To understand what happens during the decay in the frame of reference of the lab, we need to boost in the beam direction, taken to be in the z-direction. The Lorentz Boost in the z-direction is given by:  \begin{equation}\label{mat:lorenz}  \begin{bmatrix}  ct' \\  x' \\  y' \\  z' \\  \end{bmatrix}  = \begin{bmatrix} \gamma & 0 & 0 & - \beta \gamma \\  0 & 1 & 0 & 0 \\  0 & 0 & 1 & 0 \\