When I open this answer in the iOS app, I know what I supposed to see: a dollar sign, the number 20, a space, the word "to", another space, a dollar sign, and the number 50. Instead I see the number 20, the word "to" in italics, and the number 50, with no spaces or dollar signs.
It seems like the app is forcing the MathJax to render, even when there's slashes before the dollar signs. I'm pretty sure this is a bug.
\$ this is math \$
so we added it to the list and broke all other sites.