Extension:Math

The Math extension provides support for rendering mathematical formulas on-wiki via texvc and other backends. An overview of what can currently be done with this extension is found at the English Wikipedia's documentation.

Math output modes
The choice of the rendering mode heavily depends on the amount of math the wiki uses as well as the possibility to install required prerequisites and dependencies.

Client-side rendering, e.g. via JavaScript in the users web browser, is slow.

Server-side rendering can be done at on the wiki's host server or using a public rendering host, e.g. latexml.mathweb.org.

There are the following possible configuration options:
 * without command-line access to the server
 * no rendering (MW_MATH_SOURCE)
 * client-side rendering with MathJax (MW_MATH_MATHJAX)
 * with command-line access to the server
 * server-side rendering with LaTeX (MW_MATH_PNG)
 * server-side rendering with Mathoid (MW_MATH_MATHML), which is the rendering mode that is going to be used on Wikipedia in future.
 * server-side rendering with LaTeXML (MW_MATH_LATEXML)

If multiple modes are enabled, logged in users can set a personal preference in the appearance pane of their user preferences page.

For a shared host with command-line access
Compiling texvc will need to be done offline. Identify the OS of the shared host, and install the same e.g. in a virtual machine on a desktop PC. Then for example in Ubuntu, all dependencies can be installed using: Get the Math extension and make texvc etc.: Upload the texvc-files.tar.gz archive to the host and extract the required files into the $IP/extensions/Math folder.

On a (virtual) private server with command-line access
In some Linux distributions texvc and texvccheck come already built in the MediaWiki Math packages.

See compare>Special:MyLanguage/Comparison of extensions in distributions|Comparison of extensions in distributions.

For example in Debian/Ubuntu to install mediawiki-math-texvc and any other packages on which it depends:

Client-side rendering with MathJax
From 1.19/1.20, the Math extension supports rendering via MathJax, a client-side JavaScript library for parsing latex or mathml code and producing in-browser representation using the browser's native support for HTML+CSS, or MathML, or SVG.

This can render math expressions more sharply (using subpixel antialiasing) and larger (scaling up for zoomed view, printing, or high-resolution screens).

Set $wgUseMathJax to enable MathJax rendering mode; it is still somewhat experimental. Users will have a check box on their preferences that will enable MathJax, or set MathJax to the default mode as shown below.


 * Settings (Math 1.1 // MW 1.19 - 1.22)


 * Settings (Math 1.2 // MW 1.23+)

See also ext-MathJaxMenu>Special:MyLanguage/Extension:Math/MathJaxMenu|How to modify the MathJax contextual menu.

Server-side rendering with Mathoid
Beginning from Math 1.2 // MW 1.23+ you can use a Mathoid server that uses MathJax to convert texvc input on the server side to MathML+SVG rendering. Mathoid is the rendering mode that is going to be used on future Wikipedia. For that the following settings are recommended:

Check out mathoid>Special:MyLanguage/Mathoid|Mathoid to find instructions how to run your own Mathoid server. After enabling the MathML rendering mode you have to run the database update script again to create the required table.

Server-side rendering with LaTeXML
A convenient option to render LaTeX is to use the LaTeXML web service. This service converts LaTeX to high quality MathML.


 * Settings (MW 1.22) most or all of the 1.23+ settings also work


 * Settings (Math 1.2 // MW 1.23+)

A short guide to install LaTeXML on your own server can be found here: [http://www.formulasearchengine.com/node/3 Install LaTeXML]

After enabling the LaTeXML rendering mode you have to run the database update script again to create the required table.

Local LaTeX image rendering
To use your local webserver (default in Math 1.0, 1.1, is now deprecated) to convert the texvc input to PNG images via a local LaTeX installation and OCAML based translation from texvc to LaTeX you have to install texvc>Special:MyLanguage/texvc|texvc.

Installation of texvc

 * 1) If MediaWiki does not have write permissions to , see config items below  ,   and   you will have to grant them with e.g. *)
 * 2) Compile texvc
 * Install the required prerequisites and dependencies
 * Switch the directory
 * Compile texvc
 * Compile texvc
 * Compile texvc

To make the rendering of mathematical formulas possible with the Collection extension texvc must be installed in PATH (see the alternative installation methods just below)


 * Alternatively install the mediawiki math packages
 * 1) (includes MediaWiki and Math) or
 * 2) (just texvc)

List of all configuration settings
The following variables can be defined in LocalSettings.php after calling :

Purging pages that contain equations
Specifying the URL-parameter action=purge does not force the math equation to re-render the math tags. If a complete re-rendering of the math tags is desired the URL-parameter action=purge&mathpurge=true has to be passed. Be aware that this might cause side effects with other pages since the math extension uses the hash of the input TeX-input-string as the caching key. e.g. if you would force the re-rending with mathpurge option for a page containing the equation $E=mc^2$, the new rendering result would be used on all other pages containing $E=mc^2$ after the individual page caches are invalidated.

Error reporting
If something is wrong with the math extension you can report that at [https://bugzilla.wikimedia.org/enter_bug.cgi?format=guided&product=MediaWiki%20extensions&component=Math bugzilla]. In addition you should check how your problem relates to the automated unit tests that are generated from the page math-test>Special:MyLanguage/Extension:Math/CoverageTest|CoverageTest.

MathJax errors
MathJax has more bugs than latex. So please check if it's an MediaWiki Bug or a [https://github.com/mathjax/mathjax/issues MathJax problem]. If it's a MathJax problem that has been fixed you might consider to port the change to MediaWiki version of MathJax. Therefore a [http://formulasearchengine.com/review development environment] is required. Just cherrypick the change from MathJax and apply it to the modules/MathJax folder in the Math extension. Afterwards you can submit your change for review.

History
The Math extension was a part of the core MediaWiki software until MediaWiki 1.18. See the related bug #14202 on Bugzilla.

MW_MATH_MATHML/MW_MATH_LATEXML was implemented to perform MathML generation instead of texvc because texvc is very poor at creating MathML. See the historic option "MathML if possible (experimental)".