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\section{Writing mathematical notation}  Authorea supports \LaTeX, a powerful typesetting program that renders beautiful math notation.  There are three ways to present a mathematical expression--- \emph{inline} or as \emph{inline}as  an \emph{equation}. \subsection{Inline mathematical expressions}  Inline expressions occur in the middle of a sentence. To produce an inline expression, place the math expression between dollar signs (\verb!$!). For example, typing \verb!$E=mc^2$! yields $E=mc^2$.