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LaTeX is not working just now. I posted this question, and the LaTeX code is plainly rendered as ASCII.

R: There is a more elegant/efficient way of writing this?

(possibly a duplicate of this one

LaTeX support in Mobile Application

but I also see it on PC, and I didn't check on a phone)

Edit: I edited the linked post to remove Latex code, and used unicode instead.

4

Go to Which Stack Exchange sites use MathJax?:

Stack Overflow isn't in the list, so no mathJax there.

Mathjax is quite dependency-heavy and can slow down the load time of every page (more on the performance issues here), so there hasn't been enough need demonstrated on Stack Overflow to burden everyone with that overhead.

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