I'm using the Stack Exchange app for Android. The app displays TeX formulas inside questions and answers as expected, but not in comments. Here it shows only the raw TeX code. I first noticed this issue in a comment on the Electrical Engineering site.

migrated from stackapps.com Dec 8 '14 at 20:59

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    According to this answer you need to tap the comment first and choose "Render Mathjax" – Shadow Wizard Dec 8 '14 at 21:04
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    Thanks for moving the question to this site. Is there a reason why MathJax is not enabled by default? – Paebbels Dec 8 '14 at 21:23
  • It was @Tim Stone, not me, as for why not enabled by default most likely because it would slow things down too much. – Shadow Wizard Dec 8 '14 at 22:02
  • I tried Render Mathjax, but it does not render \$\frac{1}{16}\$. It's still tex code. – Paebbels Dec 11 '14 at 20:40
  • Weird, I thought this should be the same. Leave a comment to Kasra on his reply to the dupe, and see what he has to say. (e.g. bug or by design) – Shadow Wizard Dec 11 '14 at 20:52
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    @Paebbels repro'd on my end, looking into this now. – Kasra Rahjerdi Dec 11 '14 at 21:45
  • This still has not been fixed. – Jerard Puckett Dec 19 '14 at 15:45
  • @KasraRahjerdi Are there any updates on this issue? – Paebbels Jan 20 '15 at 1:29
  • Unlike most MathJax-enabled sites, where the delimiters for online math are single dollar signs $..$, Electrical Engineering uses the dollar sign preceded by backslash: \$ .. \$. It appears that the MathJax configuration shipped with the app does not take this difference into account. I don't think that one configuration file could handle both sorts of delimiters at the same time; it seems the app should load different MathJax configurations for different sites. – user259867 Mar 15 '15 at 14:07
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    @KasraRahjerdi It would be a good idea to notify math.stackexchange users of the possibility to render MathJax in the comments if they are on their mobile. How? I am not sure about the best way, but maybe in a tutorial like pop up. – Matheus Rotta Nov 16 '16 at 1:15
  • @MatheusRotta this is a great idea. We can detect when it's the first time they are seeing a comment with MathJax markup in it and tell them about this functionality. – Kasra Rahjerdi Nov 16 '16 at 1:44

Since v1.0.83or somewhere before that, it has been fixed: the app renders the MathJax comment correctly while following per-site's MathJax delimiters.

Note: you still need to tap the comment and select "Render MathJax" to see the rendered text.

LaTeX comment on EE.SE

  • Note: "Render MathJax" is available on comments that have MathJax markdown even though the site doesn't support it (e.g. Meta SE). It just won't work though. $\frac{1}{16}$ – No Distraction Wizard Feb 23 '16 at 3:44
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    1.0.84 will use the correct escapes for a given site when deciding whether or not to show "Render MathJax". – Brian Nickel Mar 15 '16 at 21:16
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    Is the answer to 'why isn't MathJax auto-rendered in comments viewed in app' officially 'because it would slow the app down too much?' – MonaLisaOverdrive Mar 20 '16 at 18:05
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    @MonaLisaOverdrive I think I found answer to the "why" aspect in this post by Kasra Rahjerdi. Quoted in part (and very mildly paraphrased): "Adding MathJax / LaTeX to question and answer bodies is really easy, but adding it to comments, question titles, and the question listings is troublesome. Since everything in the app other than the question/answer bodies are native code rather than webviews, this is going to take us a while to try and figure out. At the moment we're putting it on the backburner." – Dan Henderson Jun 7 '17 at 14:49

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