The Math extension (or, more broadly, the rendering of the [itex] tag) has a long history. It has been modified by a number of different people with different goals, different ideas, and different programming styles, using different underlying technologies. As a result, this extension's design and documentation are somewhat chaotic.

An overview of what can currently be done with this extension is found at the English Wikipedia's documentation.

The aim of this page is to coordinate the development activities concerning this extension.

## Wanted features

• MathML support - phab:T131177  Done
• Specification of the subset of commands that are allowed "MediaWiki uses a subset of AMS-LaTeX markup, a superset of LaTeX markup which is in turn a superset of TeX markup, for mathematical formulae"
• Automatic testing - [1]  Done
• Security strategy
• Links to formula (in the current development version \$parser->nextLinkID() is used to generate an anchor id, which is not human readable. The problem is that the same TeX string can occur more than once in page.) see Extension:MathSearch  Done [2]
• Automatic numbering of equations (bug 5600)
• To be able to install without having to apt-get/make texvc etc.

## Current activities

Currently the following changesets are open: https://gerrit.wikimedia.org/r/#/q/status:open+project:mediawiki/extensions/Math,n,z

## Next steps

The next step is to collect problems with MathML rendering with Firefox on this page. Note that you use custom CSS to change the default font or even switch back to SVG: https://www.mediawiki.org/wiki/Extension:Math#CSS_for_the_MathML_with_SVG_fallback_mode

• In displaystyle the symbol ${\displaystyle \displaystyle \iiiint _{A}}$ does not look like the other integral symbols (${\displaystyle \displaystyle \oint _{A}\int _{A}\iint _{A}\iiint _{A}}$). --Christian1985 (talk) 17:06, 29 October 2014 (UTC)
• Task 1: Figure out how this realtes to Mathjax bug 116--Physikerwelt (talk) 17:58, 29 October 2014 (UTC)
• Which font-family are you using? That works well for me with Latin Modern Math.
• Yes it works well with the font Latin Modern Math. I tested it with Cambria.--Christian1985 (talk) 20:44, 29 October 2014 (UTC)
• The MathVariants table is missing an entry for the QUADRUPLE INTEGRAL OPERATOR U+2A0C. I reported this to Microsoft Frédéric Wang (talk) 09:05, 31 October 2014 (UTC)

• I think it would be nice when big symbols like integrals ${\displaystyle \int _{A}}$ in body text will be displayed in textstyle ${\displaystyle \textstyle \int _{A}}$. --Christian1985 (talk) 17:06, 29 October 2014 (UTC)
• I'm not sure if that's a question specific to MathML in Firefox. By default, all formulas are in "inline displaystyle". However, we introduced the two new more classical modes. See http://math-preview.wmflabs.org/wiki/Displaystyle. Frédéric Wang (talk) 08:03, 31 October 2014 (UTC)
• Perhaps this question should be discussed in another place. I got accustomed by MathJax to small formulas in running text.--Christian1985 (talk) 14:36, 31 October 2014 (UTC)

• The symbol ${\displaystyle \lim _{x\to {x_{0}} \atop x\in I}}$ does not look very nice. The distance between ${\displaystyle \lim }$ and ${\displaystyle x\to x_{0}}$ is too small.--Christian1985 (talk) 18:05, 29 October 2014 (UTC)
• This is a major problem, and should be resolved before I'd propose to make MathML standard for Firefox users. It might be a MathJax bug so I reported it as bug 948 --Physikerwelt (talk) 18:27, 29 October 2014 (UTC)
• I'm not sure why an <mfrac> is generated by MathJax here.
• With the font Latin Modern Math the ${\displaystyle 0}$ below the ${\displaystyle \lim }$ is too big.--Christian1985 (talk) 20:44, 29 October 2014 (UTC)

• The symbol ${\displaystyle \bigoplus }$ (\bigoplus) is compared to ${\displaystyle \sum }$ very small.--Christian1985 (talk) 18:16, 29 October 2014 (UTC)
• Question: How large should the symbol be? Should they be the same size. LaTeXML adds the attribute mathsize="1.5em" to the mo element that contains the ⊕ but does not add the same attribute to ∑ ... however that seems to be a hack. If LaTeXML rendering is considered as correct, I could contact the LaTeXML developers how and why this was done. --Physikerwelt (talk) 18:38, 29 October 2014 (UTC)
• I think it should be a little bit smaller then the symbol ${\displaystyle \sum }$. In the skript the symbol has the correct height.--Christian1985 (talk) 18:47, 29 October 2014 (UTC)
• Which font-family are you using? That works well for me with Latin Modern Math.

• Follows after formula a comma, then the distance between formula and comma is too big. Example: ${\displaystyle \omega }$, --Christian1985 (talk) 19:19, 29 October 2014 (UTC)
• This is because there is a space in the code generated by MediaWiki: </span> ,
• The Integral ${\displaystyle \int _{\mathbb {R} ^{n}}}$ looks not very well. I think the Space between the Integral and ${\displaystyle \mathbb {R} }$ is too small.--Christian1985 (talk) 20:21, 31 October 2014 (UTC)

• Sometimes I get an Error like the following:
Fehler beim Parsen (MathML mit SVG- oder PNG-Rückgriff (empfohlen für moderne Browser und Barrierefreiheitswerkzeuge): Ungültige Antwort („<p>Fehler beim Abruf der URL: Empty reply from server </p>“) von Server „http://mathoid.svc.eqiad.wmnet:10042“:): H^i(E.,D_.)
(Can I generate the Error Message in English by certain settings?) But if I click on edit and then on preview, I don't get an error. After that I go back to read mode, the error is back. If a reload the page after some hours, then the error is gone. For example I got the Error on the page de:Hodge-Zerlegung#Satz_von_Hodge and same days ago on the page de:Hauptachsentransformation.--Christian1985 (talk) 20:49, 31 October 2014 (UTC)

• In the Symbol ${\displaystyle {\frac {\partial g}{\partial {\overline {f(z)}}}}(f(z_{0}))}$ from de:Wirtinger-Kalkül the bar over f(z) is slipped in the "fraction line".--Christian1985 (talk) 22:22, 31 October 2014 (UTC)

• Double sub- oder superscripts: in ${\displaystyle {a^{c}}^{b}}$ or ${\displaystyle {a_{c}}_{b}}$ the b should be in a smaller font than the c. Applies to mixed cases as well. --Quartl (talk) 12:02, 1 November 2014 (UTC)

• Primes: in ${\displaystyle v'}$ or ${\displaystyle v''}$ the primes are too high. --Quartl (talk) 12:02, 1 November 2014 (UTC)

• Vector arrows: in ${\displaystyle {\vec {v}}}$ the vector arrow is (slightly) too large. --Quartl (talk) 12:02, 1 November 2014 (UTC)

• Centering: in ${\displaystyle \|f\|_{w}={\sqrt {\langle f,f\rangle _{w}}}}$ the first f is not centered within the brackets.

• Square root: in ${\displaystyle {\sqrt {\frac {1}{2}}}}$ the square root sign extends too far below and the vinculum is not aligned (similar to the one above). Also in ${\displaystyle {\sqrt {\tfrac {1}{2}}}}$. --Quartl (talk) 12:02, 1 November 2014 (UTC)
• I think this is a problem with the Cambria font. With the Latin Modern Math font the square root has the right height.--Christian1985 (talk) 15:36, 1 November 2014 (UTC)

• Unary minus: in ${\displaystyle (3,-5)}$ the minus should be closer to the number. --Quartl (talk) 12:28, 1 November 2014 (UTC)

• Operators: in ${\displaystyle \dim V=\dim \mathrm {ker} (f)+\dim \mathrm {im} (f)}$ there should be spaces between dim and ker or dim and im. Similarly ${\displaystyle \sin \cos x}$. --Quartl (talk) 12:28, 1 November 2014 (UTC)
• Decimal comma (used in languages like German or French): The feature/hack used to get the correct spacing for a decimal mark rather than a list seperator {,} is not working in MathML--Debenben (talk) 16:19, 26 November 2015 (UTC)
• Multiletter quantities (for example Reynolds Number): The feature/hack used to get the correct spacing as one Quantity rather than a multiplication \mathit{Re}. These quantities are quite rare, so maybe there is a better way of writing this.--Debenben (talk) 16:19, 26 November 2015 (UTC)

## Bugs and Roadmap and random thoughts (From the discussion page)

### Feature Requests

• 5856, 10186 and 6722 are related to mhchem package. Users seem to be very interested in this. Perhaps this should looked into.
• 20902 request to install chemarr
• 28258 It would be nice to have some commutative diagram packages. xy-pic may be a good option.
• 31546 Make error messages for Math use wikitext

### Visual Appearance Issues

• 15777 I have to agree this looks fairly bad. Curious if switching to dvisvg would straighten this out.
• 38722

For a list of all bugs see [3]

#### Localization

• 2458 In TeX/LaTeX terms, this is about the babel package.

#### Abandoned changes

A list of abandoned changes. If anybody want to work on them the can be restored: