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\section{How to use LaTeX to write mathematical notation}  There are three ways to present a mathematical expression--- \emph{inline} (in the middle of a text line), as an \emph{equation}, on a separate dedicated line, and as a full-sized inline expression (\emph{displaystyle}). \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 $E=mc^2$.