deletions | additions       diff --git a/Electromagnetism.tex b/Electromagnetism.tex  index 8ffa24a..2521bff 100644  --- a/Electromagnetism.tex  +++ b/Electromagnetism.tex 
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Then \begin{equation}  A_{\mu}=eta_{\mu A_{\mu}=\eta_{\mu  \nu}A^{\nu} \end{equation}  Which gives \begin{equation} 
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\frac{\varphi j}{c} -A_xk -A_y +A_zi \\  \frac{\varphi k}{c} +A_xj +A_yi-A_z  \end{bmatrix}  \\  =  \begin{bmatrix}  \frac{\varphi}{c} \\