LaTeX:About
LaTeX 
About  Getting Started  Diagrams  Symbols  Downloads  Basics  Math  Examples  Pictures  Layout  Commands  Packages  Help 
Latex, or , (pronounced lahTEK or layTEK) is a typesetting markup language that is useful to produce properly formatted mathematical and scientific expressions.
Using LaTeX in the Community, the AoPSWiki, or the Classroom
If you are just learning for use on the AoPS site, then go to the LaTeX on AoPS page. If you would like to produce full documents of your own, please follow the directions below.
Getting Started with Writing Documents in LaTeX
 The first step is to install the software to use LaTeX on your computer.
 For Windows, follow these instructions (in order):
 For Mac, visit this site and follow the directions.
 For Linux, follow these instructions (in order):

For Google Docs, you can get AoPS syntax (math only) through these steps:
 Click +free at the top of the Google Docs addon store page for AutoLatex Equations.
 Follow the popup instructions. For a full tutorial, visit the official website.
 Work through the "Basics" pages:
 The First Document page walks you through creating your first LaTeX document.
 The Math page shows you how to typset mathematics in LaTeX.
 The Style section shows you how to control the basic appearance of your document.
 Learn how to add images to your LaTeX documents.
 Use our LaTeX quickreference guides to learn more about:
 The layout of your document.
 The different symbols available in LaTeX.
 Some of the commands in LaTeX, and how to define your own new commands.
 Various external packages that can increase LaTeX's abilities, and how to create your own new packages.
 Use the TeXer to experiment and practice writing mathematical formulas.
 Use the Help page and the LaTeX forum for more help.