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This article is about LaTeX commands. Commands begin with a backslash, followed by the command name, then optional parameters enclosed in square brackets, and required parameters enclosed in curly braces. Commands control the way LaTeX operates, unlike symbols, which render text.

## Preamble commands

The structure of a LaTeX document is

\documentclass{class} … your preamble goes here … \begin{document} … the text of the document itself goes here … \end{document}

There is no preamble if you are using LaTeX in a wiki; the wiki $...$ tags put you in a math environment within the text of the document itself.

### documentclass command

documentclass is the first command of a LaTeX document, and identifies the type of document contained in the input file.

\documentclass{documentclass}

### usepackage command

usepackage tells LaTeX to load packages of environments, commands, and symbols for specific purposes. The amsmath package, for example, contains a comprehensive set of mathematical symbols.

\usepackage{amssymb,amsmath}

### numberwithin command

The preamble command, \numberwithin{equation}{section} can be used to number equations with the two-level name m.n (section number.equation number).

## Meta commands

"Meta" is my name for commands that affect other commands, or the way LaTeX operates.

\input{filename.tex} includes the contents of another file within the current file.

## Environment commands

An environment exists in the text between the \begin and \end commands.

\begin{environment} ... commands and symbols valid in this environment \end{environment} 

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