Equations with no number; saving the \label for later \ref; equations left-aligned

[Bas Braams]

Thank you to the creators and developers of MathJax, which I use
through Wikidot.
I have a few questions about equations in MathJax. (1) Is it possible
to create an isolated displayed equation without equation number? I
don't see the LaTeX \nonumber command and I don't see an \equation*
environment. (2) I am missing commands \label and \ref. I believe that
it is intended to introduce them in MathJax 1.2, or maybe it was 2.0.
Is there some way for a ordinary user to access a development version
of MathJax that already offers \label and \ref? (3) What would be the
recommended customization to have displayed equations numbered on the
left and left-aligned rather than centred?

[Davide P. Cervone]

> Thank you to the creators and developers of MathJax, which I use
> through Wikidot.
> I have a few questions about equations in MathJax. (1) Is it possible
> to create an isolated displayed equation without equation number?

MathJax v1.1 does not produce equation numbers on its own, so unless
you have used \tag, the equation numbers are not being produced by
MathJax. Perhaps they are generated by the Wikidot plugin? MathJax
v2.0 will provide for automatic equations numbers, but is not yet
released.

> I don't see the LaTeX \nonumber command and I don't see an \equation*
> environment.

These are both in MathJax v2.0.

> (2) I am missing commands \label and \ref. I believe that
> it is intended to introduce them in MathJax 1.2, or maybe it was 2.0.

Yes, they will be in v2.0.

> Is there some way for a ordinary user to access a development version
> of MathJax that already offers \label and \ref?

There is not a version on the CDN that includes these features (and
there won't be until MathJax v2.0 is released).

If you have MathJax installed on your own server, you can check out
the v2.0-candidate branch of my fork of MathJax, which includes these
features.

> (3) What would be the
> recommended customization to have displayed equations numbered on the
> left and left-aligned rather than centred?

MathJax.Hub.Config({
TeX: {
TagSide: "left"
},
displayAlign: "right"
});

You may also want to set

displayIndent: "2em"

if you want to have the equations not be all the way to the right.

Note that the TagSide will only affect equation tags that are actually
produced by MathJax. I suspect that yours may be generated by the
plugin for your wiki, and that is outside of MathJax's control.

Hope that helps.

Davide