Adding article-specific LaTeX macros

[tOgg1]

For some articles it would be great to have the possibility of creating local LaTeX macros. E.g. in the article TFY4165 right now there is a need for the inexact-differential symbol, which "needs" a macro to be defined, something along the lines of

\newcommand{\dbar}{\ensuremath{\mathchar'26\mkern-12mu d}}

(the example just to convince you this actually has use cases)

Also, could it be possible to import, in any way, a non-default package?

[sigvef]

\newcommand is already supported, but it must be declared while in math mode. Unfortunately, \mathchar is not supported right now. Currently, the best option for creating the inexact-differential symbol would be to do something like $ đ $.

Also, could it be possible to import, in any way, a non-default package?

Any extension (aka package) from https://github.com/leathrum/mathjax-ext-contrib should be technically possible to import. Other than these, importing packages is non-trivial.

[tOgg1]

but it must be declared while in math mode.

So if I do $$ \newcommand{\dbar}{\ensuremath{\mathchar'26\mkern-12mu d}} $$ somewhere, \dbar would work?

[sigvef]

No, unfortunately, since \mathchar doesn't work on Wikipendium. Other \newcommands that don't use \mathchar work fine though. As an example, doing:

$ \newcommand{\bigO}[1]{\mathcal{O}\bigl(#1\bigr)} $
$ \bigO{n^2} $

yields:

[tOgg1]

Ah yes, you said that already. Right.