MathJax is a JavaScript library that displays mathematical notation in web browsers, using MathML, LaTeX, to display "pretty" math notation, useful when describing complex constraints, drivers, shaders, among others, like the example below.
Typing $$\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}$$
produces
$$\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}$$
It was recently pointed out by a community manager over chat that on sites where MathJax is enabled, the Markdown editing help page includes a link to a MathJax formatting help guide.
By default, this link points to the URL https://legacy-www.math.harvard.edu/texman/, which is an external site.
This link can apparently be customized, and on a few sites it points to a dedicated meta post about it; on others, to the Mathematics Meta post "MathJax basic tutorial and quick reference".
Since our site has MathJax enabled, where should our help page link point to?
Ideally this would point to our own meta post about it, but other suggestions are welcome.
Anyone is free to post their own suggestions, one per answer. Please vote on the answers below that you think serve our community best, downvote the ones that do a disservice. The answer with most votes will be implemented.