Displaying mathematics for STACK in Moodle
STACK generates LaTeX code on the fly and expects to use a Moodle filter to convert this into something the user's browser will display. For Moodle 2.7 or later, MathJax is distributed as a filter. We strongly recommend using the Moodle MathJax filter. One reason for adopting MathJax is that it aids accessibility.
Using the MathJax filter
These are notes on configuring the MathJax filter options for use with STACK.
 Do not use "TeX filter compatibility" unless you want all equations to appear inline!
 To add support for actuarial notation you need to add the option 'enclose.js' to the extensions. I.e. within the "MathJax configuration" text we need the following.
TeX: { extensions: ['enclose.js'] }
Accessibility
Among other things, MathJax allows screenreaders to read mathematics in a meaningful way which is critical for students who rely on this technology, or simply find it easier to learn with an aural option. For this to work, information must be typed up, not contained in a screenshot.
The accessibility features supported by MathJax are given detailed in the MathJax documentation and YouTube.
Adding MathJax to additional HTML
If the MathJax filter is not available then you can include it in the head of every page by adding additional HTML to every page. We don't recommend you do this, but have retained this information in the documentation for completeness.
Option 1: install MathJax locally
A local installation may be preferable, e.g., if you want your STACKequipped Moodle to work offline, or if you want to try to speed up LaTeX rendering.
 Download MathJax
 Unpack the archive and rename folder to "mathjax".
 Place the mathjax folder in .../moodle/lib and set appropriate ownership, e.g.,
chown R root.root mathjax
. 
Carry out the procedure in Option 1, editing the script above to reflect your path to MathJax. The last line can resemble the following:
Option 2: link to external MathJax setup
As of August 2017, you can use an external CDN at cdnjs.cloudflare.com
.
 Admin > Appearance > Additional HTML > Within HEAD

Put the following script in it and save
Please note the following.
 These settings enable only the strict LaTeX maths environments, and does not support the use of dollars;
 The
processEscapes
flag enables you to include a dollar symbol in mathematics environments with\$
.  The line
extensions: ['enclose.js'],
enables support for actuarial notation.  The line
Macros: { pounds: '{\\it\\unicode{xA3}}', euro: '\\unicode{x20AC}' }
enables support for the UK pounds sign and the Euro symbol in LaTeX using\pounds
and\euro
macros respectively. E.g. and .
What about dollar mathematics delimiters?
Please note that we strongly discourage the use of dollar symbols for denoting LaTeX mathematics environments such as $...$
and $$...$$
for inline and displayed mathematics respectively. As of STACK 4.0 use of dollars are officially unsupported.
The reasons are (1) they do not match, which makes parsing more difficult, and (2) many courses use currency which needs this symbol and protecting it is always problematic.
If you have extensive existing materials using these delimiters then we have scripts which will automatically convert them for you. All fields within existing questions can be converted with the automatic scripts available from
Home > Site administration > Plugins > Question types > STACK
If you have adhoc text to convert then the CAS chat script always converts dollars into the forms \( .... \)
and \[ .... \]
. You can test and edit the display of text in this window to see the conversion.
If you really want to use dollars, MathJax can display them with the code
displayMath: [['$$', '$$'], ['\\[', '\\]']],
inlineMath: [['$', '$' ], ['\\(', '\\)']],
Before deciding to support the use of dollars for mathematics on your site, please see the notes on the use of dollars for currency.