لاتخ

\documentclass[12pt]{article}
\title{\LaTeX}
\date{}
\begin{document}
  \maketitle \LaTeX{} is a document preparation system for the \TeX{} 
  typesetting program. It offers programmable desktop publishing 
  features and extensive facilities for automating most aspects of 
  typesetting and desktop publishing, including numbering and 
  cross-referencing, tables and figures, page layout, bibliographies, 
  and much more. \LaTeX{} was originally written in 1984 by Leslie 
  Lamport and has become the dominant method for using \TeX; few 
  people write in plain \TeX{} anymore. The current version is 
  \LaTeXe.
  \newline
  % This is a comment, it is not shown in the final output.
  % The following shows a little of the typesetting power of LaTeX
  \begin{eqnarray}
E &=& mc^2  \\
m &=& \frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}}
  \end{eqnarray}
\end{document}