Newcommand support

[chtenb]

Would it be possible to support the newcommand command? So we can do things like

$\newcommand{\R}{\mathbb{R}}$

This would avoid a lot of tedious typing and greatly increases the plain text readability (which is what markdown was intended for).

[volca]

@zgce is it possible to extend the MathJax extension with the feature?

[zgce]

Do you want to add a option to setting MathJax and Katex? @volca

[no-mood]

Any update on this?