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\section{What is LaTeX?}  LaTeX is a programming language that can be used for writing documents. It is especially useful to write mathematical notations: equations equations, f  and sciences fields due to its ease of writing special symbols and equations while also making them look good. For those not using special characters LaTex requires minimal learning, making it a very approachable language. However, you don't have to learn LaTeX to use Authorea! \href{http://help.authorea.com/write/structure-of-a-document/how-to-write-mathematical-equations-and-formulae}{Check out how you can write math formula using our visual equation editor}. \section{Writing mathematical notation in LaTeX}  Authorea supports \LaTeX, a powerful typesetting program that renders beautiful mathematics. In order to insert a LaTeX block in your document, \textbf{select Insert from the editor toolbar, and select LaTeX}. \href{http://help.authorea.com/write/structure-of-a-document/how-to-write-mathematical-equations-and-formulae}{More instructions here}. 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}).