Only very recently, I noticed that MathJax does not work correctly in questions. For instance, set brackets are not displayed any more:

$\{1 \}$

If I post the same as an answer, it works correctly. There are several other examples. Before I never had this problem.

What happened?

  • $\begingroup$ Oh, in the published question it is displayed correctly. So, the bug might appear in the preview, only. Then, of course, it's just annoying, but not really a problem. $\endgroup$
    – Ulli
    Nov 19 at 8:36
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    $\begingroup$ If you experience the bug only in the preview, the tag (markdown-preview) might be suitable here. And probably it would be good to include a screenshot - so that other can see what you saw (if they cannot reproduce the same bug). $\endgroup$ Nov 19 at 12:38
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    $\begingroup$ I am not sure, but perhaps these past questions are about a similar problem: \{, \}, \| and \\ need an extra backslash to be rendered correctly in math when composing a new question in MSE. and MathJax preview works incorrectly in Google Chrome. $\endgroup$ Nov 19 at 12:39
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    $\begingroup$ @Martin Slezak: yes, I think at least the first one is the same. I'm using Firefox, so the second one might be different. BTW: was this (sorry to call so) bug always there? Never experienced it before. Will math.stack.exchange repair it? $\endgroup$
    – Ulli
    Nov 19 at 17:04
  • $\begingroup$ Curly brackets have always been used in $\LaTeX$ to delimit arguments to various typeset constructions. So literal display of curly brackets has always required escaping them with backslashes in the MathJax display environment, e.g. for set builder notation. $\endgroup$
    – hardmath
    Nov 20 at 23:28
  • $\begingroup$ @hardmath: yes, of course, I escaped the curly brackets with "\". And only in the preview, they were not displayed. Hence, my syntax was correct! The problem is the preview of math.stack.exchange. $\endgroup$
    – Ulli
    Nov 22 at 14:31


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