Automatic equation numbering (Latex Math)

[gafsiqueira]

Is it possible already to show the equation numbers? For instance when I write

$$F=ma$$

I would like to get something like:

F=ma (1)

By the way Obsidian is awesome. Keep up the good work.

Thanks in advance.
Best regards.

Gafsiqueira

[death.au]

I’ve moved this to the Feature requests category

[gafsiqueira]

Thanks.

[singhrac]

I think it could be as simple as adding this: http://docs.mathjax.org/en/latest/input/tex/eqnumbers.html

[gafsiqueira]

Nice! Are we able to do this or only devs?

[aroberge]

How about something like

$$F=ma \tag{1}$$

[gafsiqueira]

Althought you have to put the numbers manually, its a good alternative. Thank you, @aroberge!

[singhrac]

Only the devs can do this, I think, since this requires modifying JavaScript. You could mess with the internals of Obsidian, of course, but the external interface allows us to modify the CSS, but not JS.

Devs, could you take a look at this? It should only take a second to enable and is somewhat backwards compatible, in that if users don’t want number, they can just use the equation* environment instead of equation (or you can hide this option behind a flag if you’d like):

window.MathJax = {
  tex: {
    tags: 'ams'
  }
};

[gafsiqueira]

Nice, thanks @singhrac

[danbburg]

There are now several feature requests that are all essentially the same - additional control over MathJax initialization and extensions. In addition to this one I found the following:

MathJax extensions

As Silver and StrachuDotNet recommended it on Discord, I’m opening a feature request for MathJax extensions: here is my original post from Discord. I’m a total newbie to Obsidian, loving it so far! But would it be possible to use MathJax extensions (like color.js , etc: some of them are crucial for me (especially xypic for commutative diagrams))? Usually, the way it’s done in javascript, if I’m not mistaken, is to go something like this: <script type="text/x-mathjax-config"> MathJax.Hub.Conf…

Support for Additional LaTeX Packages

I wanted to request support for loading and using additional LaTeX packages. For example, I often need to embed chemical equations within my notes using the mhchem package. I’m not sure if this would be implemented behind-the-scenes or through the custom CSS, but would love to see a toggle or option for this. Thanks so much!

MathJax plugins

It’d be nice if we could somehow specify which plugins the MathJax engine should use. I’m talking about things like mhchem, physics and other extensions listed on this page in MathJax docs. I think there could be a global setting in preferences that would turn these on; I don’t believe it’s needed to have this on a per-file basis.

In my opinion these should all be merged since they all deal with the fine-grain control of MathJax. If these are implemented 1-by-1 I worry that the solution will be a bit inflexible. Since MathJax is a core feature I think these should be also, but if not this topic should motivate the plugin API to be able to handle these use cases.

[WhiteNoise]

Unfortunately, due to the way mathjax is implemented this is not just as easy as flipping a switch for us. This is not likely to be implemented in the short term.

[gafsiqueira]

That’s okay, I still love you guys. Keep up the good work.

[gafsiqueira]

As I just saw the notes on 8.2, perhaps this will be solved? @WhiteNoise

[WhiteNoise]

no, but we looked into it. We enabled what we could, but we can’t enable that.

[gafsiqueira]

Cool. Thanks anyways.

[WhiteNoise]

Manual equation numbering works:

$$x=y+1 \tag{1} \label{eq1}$$

As shown in $\eqref{eq1}$, $x$ is grether than $y$.

[BorisBlagov]

Hey,

did something change with newer Obsidian versions? Copying

$$x=y+1 \tag{1} \label{eq1}$$

does not render for me, because of the “\label{eq1}” part.

Thanks!

[midas0441]

Yeah, this has been finicky for me too. It’s been a while, but my recollection is that quitting and reopening obsidian numbering works again.

Anyway, the whole equation numbering issue is unworkable in Obsidian. If one has to put in the numbers with tag{1}, the elegance and power of Latex equation numbering is lost. The whole point is to avoid manual numbering.

This is a fundamental and deep flaw (IMO) that precludes long form writing involving mathematics and equations in Obsidian — without tedious manual intervention, such as tag{1}, and hackery (regex search-replace after moving text into a Latex-friendly environment).

If frustration is evident in this post, it is genuine and not meant to disparage or insult the developers for whom I have great respect and admiration for a stellar app.

[chchen]

Obsidian is very well done in general. It is a rare markdown editor for which I do not have the urge to change its default settings. However, the lack of auto-numbering is a significant drawback. I hope the developers are still working on a full MathJax support.

As a workaround, I found a solution for auto-numbering equations across Apple devices. The “One Markdown” app has both iOS and macOS versions. One Markdown automatically numbers equations as long as they are in the following format:
$$
\begin{equation}
…
\end{equation}
$$

[mayurankv]

I believe there is full mathjax support now but no equations numbering? Is there any chance this will be added in future?