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I recently commented on a question and I used the proper MathJax formatting for the numbers and letters:

picture1

Some minutes later my net became a little laggy and I refreshed the page. Then I lost my connection for a few seconds. The font of numbers changed a little for me as you can see in this screenshot:

picture2

Of course I refreshed the page again after my connection came back and the font got fixed.

What is the name of that incorrect font? Is it being used in math.SE or any other websites or applications?

Also, why did the format change when the connection was unstable?

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  • $\begingroup$ Links, to see if it's just you? (very likely)....Looks like math sans serif to me, like so: $\mathsf{k}$ (\mathsf{k}). $\endgroup$
    – Arturo Magidin
    Oct 1 at 1:46
  • $\begingroup$ Why did the MathJax format convert to the math sans serif format when I didn't had a stable connection? $\endgroup$
    – user815214
    Oct 1 at 6:12
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    $\begingroup$ Without details of your interface and set-up, it is impossible to know. $\endgroup$
    – Arturo Magidin
    Oct 1 at 6:17
  • $\begingroup$ A few minutes ago I tried this: \mathsf{k}{2} and the 2 became MathJax! $\endgroup$
    – user815214
    Oct 1 at 6:29
  • $\begingroup$ What are the interface and set-up? $\endgroup$
    – user815214
    Oct 1 at 6:33
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    $\begingroup$ How are you viewing the site? What operating system? What version? The site doesn't do the same thing for everyone. It attempts to respond to your interface and your setup, $\endgroup$
    – Arturo Magidin
    Oct 1 at 6:55
  • $\begingroup$ I'm currently on phone (Google Chrome). I will try on Windows too. $\endgroup$
    – user815214
    Oct 1 at 6:57
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    $\begingroup$ Telling me in comments is useless. $\endgroup$
    – Arturo Magidin
    Oct 1 at 17:24
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    $\begingroup$ You can read a bit about how MathJax deals with fonts here. In particular, it will sometimes "ask the browser to provide the glyph from a system font". Possibly this is what happened here - the unstable connection meant that MathJax was unable to load the correct glyph, so used the fallback option of asking the browser. $\endgroup$
    – user1729
    Oct 2 at 13:28

1 Answer 1

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It’s probably a sans-serif font like \mathsf{k}.$$\mathsf{k}$$

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  • $\begingroup$ Is there a reason that MathJax format converted to the sans-serif when the connection was unstable? $\endgroup$
    – user815214
    Oct 1 at 6:14
  • $\begingroup$ A few minutes ago I tried this: \mathsf{2}{k} and surprisingly the k became MathJax. I don't know if it helps to find the reason... $\endgroup$
    – user815214
    Oct 1 at 6:39
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    $\begingroup$ @EtackSxchange In your expression only the 2 is inside the mathsf braces. So the k will resort to the usual font. $\endgroup$
    – Peter Phipps
    Oct 1 at 14:20

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