deletions | additions       diff --git a/Massive coupling.tex b/Massive coupling.tex  index bf7cb9e..8df44b5 100644  --- a/Massive coupling.tex  +++ b/Massive coupling.tex 
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E_0 & \propto & m c^2  \end{matrix}\right.  \Rightarrow E_0 \propto \omega_0  \end{equation}   Following quantum mechanics:   \begin{equation}   \left\{\begin{matrix}   E_0 & = & \hbar \omega_0\\   E_0 & = & m c^2   \end{matrix}\right.   \Rightarrow m = \frac{\hbar \omega_0}{c^2}  \end{equation}