# PlanetMath

## Primary tabs

\documentclass{article}
% this is the default PlanetMath preamble.  as your knowledge
% of TeX increases, you will probably want to edit this, but
% it should be fine as is for beginners.

% almost certainly you want these
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}

% used for TeXing text within eps files
%\usepackage{psfrag}
% need this for including graphics (\includegraphics)
%\usepackage{graphicx}
% for neatly defining theorems and propositions
%\usepackage{amsthm}
% making logically defined graphics
%%%\usepackage{xypic}

% there are many more packages, add them here as you need them

% define commands here

\begin{document}

{\em PlanetMath} is a free, collaborative, online mathematics encyclopedia. The emphasis is on peer review, rigor, openness, pedagogy, real-time content, interlinked content, and community. Intended to be comprehensive, the project is located at the Digital Library Research Lab at Virginia Tech.

PlanetMath was started when the popular free online mathematics encyclopedia MathWorld was taken offline by a court injunction as a result of the CRC Press lawsuit against the Wolfram Research company and its employee (and MathWorld's author) Eric Weisstein.

The most common method of public communication within PlanetMath is posts. Users can add posts in the \PMlinkexternal{forums}{http://planetmath.org/?op=forums} as well as attach posts to articles, \PMlinkexternal{corrections}{http://planetmath.org/?op=globalcors}, \PMlinkexternal{collaborations}{http://planetmath.org/?op=collab}, \PMlinkexternal{requests for new articles}{http://planetmath.org/?op=reqlist}, and other posts. A system for private messaging among users is also in place.

Users who are new to PlanetMath are highly encouraged to read the following collaborations:

\begin{itemize}
\item \PMlinkexternal{PlanetMath Content Committee Guidelines'-Draft v.}{http://planetmath.org/?op=getobj&from=collab&id=113}
\item \PMlinkexternal{PlanetMath content and style guide}{http://planetmath.org/?op=getobj&from=collab&id=28}
\end{itemize}

The software running PlanetMath is written in Perl and runs on Linux and the Apache Web server. It is known as
$No\"{o}sphere$ and has been released under the \PMlinkexternal{free BSD License}{http://www.opensource.org/licenses/bsd-license.html}.

Most of the very most basic topics are covered, though PlanetMath is striving to improve coverage of elementary and intermediate topics. Due to the increasing popularity of the package PSTricks, more members of PlanetMath are able to incorporate graphics into their articles. This has enabled PlanetMath to cover many elementary and intermediate topics in geometry that were once lacking. There are several methods of creating graphics on PlanetMath. For more details on creating graphics on PlanetMath, see the collaboration on \PMlinkexternal{graphics and PlanetMath}{http://planetmath.org/?op=getobj&from=collab&id=53}.

PlanetMath also has entries on highly advanced and specialized topics. PlanetMath has entries on the integers \PMlinkname{42}{FortyTwo} and \PMlinkname{666}{NumberOfTheBeast}. The following top-level Mathematics Subject Classification categories have only one or two topic entries at PlanetMath:

\begin{itemize}
\item 74-XX, mechanics of deformable solids;
\item 76-XX, fluid mechanics;
\item 85-XX, astronomy and astrophysics.
\end{itemize}

The Wikipedia:WikiProject Mathematics/PlanetMath Exchange project assists in content exchange between PlanetMath and Wikipedia.

{\it This entry was adapted from the Wikipedia article \PMlinkexternal{PlanetMath}{http://en.wikipedia.org/wiki/PlanetMath} as of February 24, 2007.}

%%%%%
%%%%%
nd{document}
`