View source for Help:Category

{{shortcut|[[A:CAT]]}}
A '''category''' groups together various related articles. The category page itself is a page where all articles with that similar theme are listed. An example is  [[:Category:Stubs]]. All articles that contain <tt><nowiki>[[Category:Stub]]</nowiki></tt> formatting will be in this category (notice that <tt><nowiki>{{stub}}</nowiki></tt> automatically includes that category).

To directly add a page to a category, use the <nowiki>[[Category:Insert Category]]</nowiki> code. This page, for example, displays the <nowiki>[[Category:AoPSWiki]]</nowiki> code at the bottom.

To fix the alphabetization scheme on the category page, you can pipe a category. For example, <nowiki>[[Category:Mathematicians|Descartes, Rene]]</nowiki> will place [[Rene Descartes]] under D, not R.

Before creating a new category, be sure to check that such a category has not been created before (see the list below). It is possible to have a tree of categories; for example, we could have Category:Non-Euclidean geometry be a subcategory of Category:Geometry. In these cases, the specific category should be used. 

== Problem Categories ==
* [[:Category:Introductory Geometry Problems]] / [[:Category:Intermediate Geometry Problems]] / [[:Category:Olympiad Geometry Problems]]
** [[:Category:3D Geometry Problems]]
** [[:Category:Angle Chasing Problems]]
** [[:Category:Area Problems]]
** [[:Category:Area Ratio Problems]]
** [[:Category:Locus Problems]]
** [[:Category:Similar Triangles Problems]]
* [[:Category:Introductory Algebra Problems]] / [[:Category:Intermediate Algebra Problems]] / [[:Category:Olympiad Algebra Problems]]
** [[:Category:Algebraic Manipulations Problems]]
** [[:Category:Functional Equation Problems]]
** [[:Category:Graphing Problems]]
** [[:Category:Polynomial Problems]]
** [[:Category:Series Problems]]
* [[:Category:Introductory Combinatorics Problems]] / [[:Category:Intermediate Combinatorics Problems]] / [[:Category:Olympiad Combinatorics Problems]]
** [[:Category:Geometric Probability Problems]]
** [[:Category:Principle Inclusion-Exclusion Problems]]
* [[:Category:Introductory Number Theory Problems]] / [[:Category:Intermediate Number Theory Problems]] / [[:Category:Olympiad Number Theory Problems]]
** [[:Category:Diophantine Equation Problems]]
** [[:Category:Modular Arithmetic Problems]]
* [[:Category:Olympiad Inequality Problems]]
* [[:Category:Olympiad Trigonometry Problems]]

== List of Categories ==
[http://www.artofproblemsolving.com/Wiki/index.php/Special:Categories Here] is the official list of categories.

== See also ==
* [[AoPSWiki:Tutorial]]
* [[Template]]

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