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Credits to Electrical Engineering user @MarcusMüller who reported it here: Help page about embedding LaTeX is wrong, needs fixin', but it's an issue on more sites:
These sites, unlike other network sites which use MathJax (note that this list may not be completely accurate), use \$ to delimit MathJax blocks instead of $, but the Help Center says:
You can use single dollar signs to delimit inline equations
and
The equation $3x^2 + 5x +1 = 0$ has the solutions
That's my bad. I overlooked the custom delimiter handling when updating the example formula on that page.
The fix is in the queue and will be deployed shortly. Thanks for the report!
\$ delimiters for MathJax?
– Sonic the Anonymous Hedgehog
Jun 2 '20 at 0:19
$works? Do those sites use$$, or\$\$(or some other combination) for non-inline MathJax? – PM 2Ring May 30 '20 at 20:37$$works.\$is often chosen if MathJax is added late in the site lifecycle, and there are many posts which use $ for its original purpose (monetary amounts). – Glorfindel May 30 '20 at 20:51\$delimiters, but due to a bug in the snippet that generates the list, it doesn't show it. (I've asked its author to update it.) – Sonic the Anonymous Hedgehog May 30 '20 at 20:51\$to$. OTOH, we did have the massive conversion across the network ofhttptohttps... – PM 2Ring May 30 '20 at 20:58$at first, and when it didn't seem to work checked the formatting help. Since it also said$, I supposed maybe it was wonky just for me, or at the moment. Because of my initial assumption, I'm +1 on the better fix being to make it so that the help page is correct, and matched$do mean inline latex; escape them if you want monies - as Marcus said in the EE Meta post, 'we're dealing with far more math than finances' – OJFord May 30 '20 at 21:09