# Sometimes MathJax does not render some valid symbols: an example.

In this answer, a line of $$\LaTeX$$ doesn't render. (See the picture.)

It appears that this is happening with other people too.

It happens on the mobile site:

Refreshing the page doesn't make a difference.

Please help :)

EDIT: The post has been edited in the meantime. If you still want to see formula where the problems was manifested, you can check this older version. It is copied also here:

The group $$G\cong H\times K$$ with $$H\cong \langle S_H\mid R_H\rangle$$ and $$K\cong \langle S_K\mid R_K\rangle$$ has as a presentation $$G\cong \langle S_H\cup S_K\mid R_H\cup R_K\cup X\rangle,$$ where $$X=\{hk=kh\mid h\in S_H\text{ and } k\in S_K\}$$, from which it is easy to see that $$H\cong L$$ such that $$L\unlhd G$$. (Why?)

• I will just add that I see the same when I use HTML-CSS as Math Renderer. When I use SVG, I can see it. (I am on Chrome. I have observed similar behavior in this recent bug report - HTML-CSS was problematic, other renderers worked fine. Perhaps it's worth mentioning that formula in the linked post contains \text{...} - similarly as in the problematic formulas in the other bug report.) – Martin Sleziak Oct 25 at 16:04
• HTML-CSS renderer works fine for me on android chrome(I can see the missing line). – kingW3 Oct 25 at 23:27
• @Shaun With that linked answer, the HTML-CSS renderer works fine for me with FireFox $70.0$ on Windows $7$. – John Omielan Oct 26 at 0:15
• @MartinSleziak Using $\land$ instead seems to work. – Shaun Oct 26 at 0:20
• @Shaun Since the answer has been edited, I have included both a link and the original text into your post here on meta - so that other users who want to check whether that version works for them or not can do that more easily. – Martin Sleziak Oct 26 at 5:48
• @MartinSleziak hi. im having this problem. how do i fix it? – mathworker21 Oct 30 at 13:46