MathJax rendering bug with escaped dollar sign (\$), apparently only on crypto.SE Screenshot: Offending Markdown: (see also live in this post revision on crypto.SE) > $$\left|\Pr_{k\leftarrow_\\ \{0,1\}^n}[\mathcal{A}(1^n, F(k,-))=1] - \Pr_{f\leftarrow_\\ \{0,1\}^n\to\{0,1\}^n}[\mathcal{A}(1^n, f(-))=1]\right|\leq \mathrm{negl}(n).$$  Apparently, it only happens on crypto.SE. I could neither reproduce it on meta.crypto.SE (link [deleted post]) nor in math.SE's formatting sandbox (trial 1, trial 2 [deleted post]). I didn't want to spam crypto.SE and hence couldn't narrow down the offending Markdown. • One may want to note that it has not been confirmed to only happen on Cryptography. We just couldn't reproduce it on either Cryptography Meta nor Mathematics Meta. Nov 22, 2020 at 15:35 • Why do you think it’s a bug? The snippet actually shows \\\$ rather than \$. That’s indeed invalid MathJax code. Nov 22, 2020 at 18:05 • Oh, I see: the Markdown source seems to only include a single backslash. So the Markdown translator apparently incorrectly trippled the backslash in the resulting HTML (and MathJax is not to blame). That’s weird. Nov 22, 2020 at 18:14 • Some sites use \$ to delimit MathJax blocks instead of \$: meta.stackexchange.com/q/348676/282094 - and they're not sure if that's a complete list.
– Rob
Nov 22, 2020 at 21:49