HackMD doesn't allow inline math syntax that has space character right after/before the opening/closing dollar sign

[brlin-tw]

For example, $ \frac{3}{4} $ should also be interpreted as $\frac{3}{4}$. Is there any reason not so support this behavior?

[jackycute]

Hi @Lin-Buo-Ren
But that's part of the design of the inline math syntax.
You shouldn't put space around the opening/closing dollar sign.

refer to our package: https://github.com/classeur/markdown-it-mathjax

[brlin-tw]

Thanks for the pointers! I never notice the syntax until now 🤦‍

[cben]

I see that CodiMD (and HackMD) also support \\(inline\\) and \\[display\\] syntaxes. But these are not documented in https://demo.codimd.org/features?both#MathJax — do you consider them "official"?

Only single-dollar syntax has this limitation about spaces (to reduce false-positives for people using dollar sign without intention or even awareness of math syntax). \\( a^2 \\)4, \\[ a^2 \\]4, and $$ a^2 $$ all parse as math alright; newlines instead of spaces work too.

[SISheogorath]

@cben I would really welcome a Pull Request including an example to our docs page :)

This would make it official 👍 (at least for CodiMD)

[brlin-tw]

I would really like to make it configurable via YAML though...

and \escape all the regular usage of the dollar sign.