$\LaTeX$ demo (works inside this topic only)

Update, May 2018:

If you have created a Talkyard community, you can make LaTeX work, over there, by adding this script:

<script type="text/javascript" async
  src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.4/MathJax.js?config=TeX-MML-AM_CHTML">
</script>
<script>
talkyard.postElemPostProcessor = function(elem) {
  console.log('Telling MathJax to post process elem: ' + elem);
  MathJax.Hub.Queue(["Typeset", MathJax.Hub, elem]);
};
</script>

To add the script: Log in as admin, go to the admin area, click Look and Feel and then CSS and JS.

You'll need double backslases: \\( ... \\) instead of just: \( .. \) because the Commonmark parser "eats" one backslash.

/End update 2018.

Update, Mars 2019:
Now soon Chrome apparently will support MathML. And Firefox does already? Maybe this'll mean a standard? translate-text-to-MathML javascript library will appear, which ... maybe there could be an option to enable it in Talkyard. See: https://news.ycombinator.com/item?id=19344843
/End update 2019.

---

To enable writing mathematical forumlas in $\LaTeX$,
one can include a certain Javascript from http://www.mathjax.org/, plus some configuration.
I've done that on this page, using the same configuration as at http://maths.stackexchange.com.
One can enable LaTeX site wide too, alternatively.

Here's a demo: Depending on the particular configuration, some lines below work, some don't. I wonder if the Markdown processor eats some \ somehow, and if that's why \(...\) apparently doesn't work.

$\sin\Pi^2$

$$\sin\Pi^2$$

(\sin\Pi^2)

\(\sin\Pi^2\)

[\sin\Pi^2]

\[\sin\Pi^2\]

The actual source code:

$\sin\Pi^2$

$$\sin\Pi^2$$

\(\sin\Pi^2\)

\\(\sin\Pi^2\\)

\[\sin\Pi^2\]

\\[\sin\Pi^2\\]