deletions | additions       diff --git a/untitled.tex b/untitled.tex  index eef860e..2572fd7 100644  --- a/untitled.tex  +++ b/untitled.tex 
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\subsection{The basics}  Math mode in LaTeX is defined by the dollar signs.   \begin{tabular}{lll}  \emph{description} & \emph{command} & \emph{output}\\  addition & \verb!+! & $+$\\