Math equations cannot be displayed

Bug graveyard
1

Steps to reproduce

Type inline and display math and hit the preview button.

Expected result

The math equations are displayed.

Actual result

No math equations showed up.

Environment

  • Operating system: Windows 10
  • Obsidian version: 0.6.7
  • Using custom CSS: Yes

Additional information

The console in the developer mode shows as followed.

sre/sre_browser.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
mathjax.js:1 Error: Can't load "app://obsidian.md/sre/sre_browser.js"
    at new l (mathjax.js:1)
    at d.failed (mathjax.js:1)
    at HTMLScriptElement.t.onerror (mathjax.js:1)
app.js:1 FileSystem is case insensitive
7
mathjax.js:1 Uncaught Error: MathJax retry
    at Object.e.retryAfter (mathjax.js:1)
    at e.checkLoading (mathjax.js:1)
    at Object.renderMath (mathjax.js:1)
    at v.renderConvert (mathjax.js:1)
    at e.n.convert (mathjax.js:1)
    at r.N.convert (mathjax.js:1)
    at Object.S.MathJax.<computed> [as tex2chtml] (mathjax.js:1)
    at Function.gi.renderMath (app.js:1)
    at n (app.js:1)
    at gi.render (app.js:1)
DevTools failed to parse SourceMap: app://obsidian.md/pixi.min.js.map

It seems that MathJax is not loaded.

2

That is very odd. Can you try to reload the app with ctrl-r ?

4

Yes. I tried it many times. It is indeed very wired because it worked very well for a while and suddenly cannot display any math equations.

I even reinstalled Obsidian. Still not working.
Perhaps, I need to completely wipe out any files related Obsidian and then reinstall it?

5

Does this happen on all pages with math?

Does this happen on a specific page with specific math?
If so, can you share the page with us?

Did you tamper with obsidian in any way? For example using external plugins?

6

Yes, it happened to all pages and all vaults.
I did not use any external plugins, just a customized CSS.

But I can remember it happened when I was modifying the following page. I added the last equation and then the math display function crashed when I previewed.
The last equation is very long and contains “[”, it probably leads to the problem. But the problem still exists after deleting it.

# Principal component analysis

## Purpose 

To reduce the dimension of a matrix $\mathbf{X}$.

##  Method

### Based on the covariance matrix
* Let  $\mathbf{X}=U\Delta V^{\top}$ denote the [[singular value decomposition]].
* $Delta=\mathrm{diag}[\delta_1,\ldots,\delta_2]$ the singular values.
* $V\Lambda V^{\top}$ give a spectral decomposition of $\mathbf{X}^{\top}\mathbf{X}$ where 
$$ \( \Lambda_{p \times p}=var{diag}\left[\lambda_{1}, \ldots, \lambda_{p}\right]=\mathrm{diag}\left[\delta_{1}^{2}, \ldots, \delta_{p}^{2}\right]=\Delta^{2} \) $$
7

I don;t know if that is the problem anyway. I suggest you

  1. close obsidian
  2. back up your vault.
  3. delete this folder C:\Users<yourusername>\AppData\Roaming\Obsidian
  4. start obsidian

see what happens

8

I think this folder C:\Users\<yourusername>\AppData\Roaming\Obsidian should be removed. After removing it and opening Obsidian again, the math display function works!

Thanks so much for your help!

9

Ops I am sorry, I meant C:\Users<yourusername>\AppData\Roaming\Obsidian.
You are correct!

Please do let me know if this happens again and how it happens!