Amusingly, the question Is there a subfield F of the complex field with [C:F]=3?, which was closed as a duplicate, has two "Possible Duplicate" boxes, each indicating the same question as the possible duplicate (namely, What is the condition for a field to make the degree of its algebraic closure over it infinite?). Is this a bug of some sort? Obviously it's not a pressing matter, but I thought it should be brought to someone's attention.

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    $\begingroup$ Oh the irony... :-D $\endgroup$
    – Asaf Karagila Mod
    Apr 10, 2011 at 17:23
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    $\begingroup$ If you look at the edit history, there are two edits by the community user with the description "insert possible duplicate link", one at 16:11 and one at 16:53. Since Qiaochu left a comment at 16:10, I presume he closed the question right after leaving that comment, reopened it afterwards and closed the question again at 16:53. $\endgroup$
    – t.b.
    Apr 10, 2011 at 17:31
  • $\begingroup$ I guess I don't have enough rep to see the edit history you're referring to (the bottom of the question where that would usually be looks blank to me) - but that sounds like a plausible explanation. $\endgroup$ Apr 10, 2011 at 17:48
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    $\begingroup$ @Zev: Have a gander. $\endgroup$ Apr 10, 2011 at 18:33
  • $\begingroup$ @J.M., thanks! I guess that doesn't appear as a "standard" edit history because the edits were made by the community user. Is there a link to that page from somewhere on the question, or did you have to know to add "/revisions" to the end of the URL? $\endgroup$ Apr 10, 2011 at 19:20
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    $\begingroup$ I think, if I remember correctly, that when something is closed as duplicate, and then re-opened, the automatically inserted link is not automatically removed? $\endgroup$ Apr 10, 2011 at 19:51
  • $\begingroup$ @Zev: I have to say Theo's comment gave me the idea that adding the /revisions part works even on "unedited" stuff... $\endgroup$ Apr 11, 2011 at 1:47
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    $\begingroup$ @Zev: My answer to another question is related: meta.math.stackexchange.com/questions/1773/… You can always view the revision history as J.M. says, but the direct link only appears after non-Community edits. (A similar trick works on MathOverflow, e.g., mathoverflow.net/revisions/7233/list, as mentioned in tip 5 at mathoverflow.net/tips .) $\endgroup$ Apr 11, 2011 at 19:13

1 Answer 1


Might have been a duplicate action taken during a deployment which caused a race condition on close.

Anyway, all that is needed is to edit the post, which I did.

  • $\begingroup$ Quote: "all that is needed is to edit the post". Good to know. I wasn't sure whether doing so would be effective. So I can just manually go in and remove the extra duplicate box? $\endgroup$ Apr 12, 2011 at 9:48
  • $\begingroup$ I did not want to edit and bump a closed question, however it happened again: math.stackexchange.com/questions/36129 in case you want to chase down this bug or something. $\endgroup$
    – Asaf Karagila Mod
    May 1, 2011 at 6:42
  • $\begingroup$ @asaf not a bug, it was reopened and re-closed. Check the revision history. math.stackexchange.com/posts/36129/revisions $\endgroup$ May 1, 2011 at 6:48
  • $\begingroup$ Oh. Sorry :-) $\endgroup$
    – Asaf Karagila Mod
    May 1, 2011 at 7:06

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