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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, formulae, etc. LaTeX makes special symbols and equations look good! \textbf{Note: you don't have to learn LaTeX to use Authorea. You can write mathematics in Authorea using  \href{http://help.authorea.com/write/structure-of-a-document/how-to-write-mathematical-equations-and-formulae}{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}).