Automatically closed - issue fixed for 2 weeks with no activity.
On the face of it, it looked at first glance that we can't use the MathJax module with Drupal 10 because the you cannot use the MathJax CKEditor plugin within a CKEditor v5 Text format.
HOWEVER, it seems that switching Configuration Type from Text Format to Custom on the /admin/config/content/mathjax saves the day.
I saw that it spurts out a JSON array but I had no idea quite what to do with that and the link the MathJax documentation doesn't help - certainly not for me anyway but enabling this setting has sorted thing out and I am able again to use $this$ and $that$ to get what I want to show!
So, for anyone faced with the same WFT, there's the solution for you, simply:
1) Visit /admin/config/content/mathjax.
2) Tick the Custom radio button under Configuration Type.
3) Save the configuration.
4) Carry on wrapping up your wares in $...$ and $$...$$
I hope someone else finds this useful and I apologies is this advice already appears somewhere else and I've missed it
Fixed
4.0
Miscellaneous
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Automatically closed - issue fixed for 2 weeks with no activity.