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I answered a question earlier today. It asked something like for an element $g$ of a free group, does there exist a finite-index subgroup of the free group such that g is a basis element of the subgroup. The author seems to have deleted the question. I can't seem to find it in my history (but I switch computers frequently and don't remember which one I was using).

Can a moderator locate the deleted question? One concern of mine is that it would have been a pretty good homework question for an course in geometric group theory. That's the only real reason I can imagine it being deleted (since it had multiple upvotes when I answered it).

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  • $\begingroup$ Do you mean this one?: mathoverflow.net/questions/252184/… $\endgroup$ – Stefan Kohl Oct 14 '16 at 21:42
  • $\begingroup$ Yes, that's the one. It's a fine question, and I can't think of any reason it would be deleted. $\endgroup$ – Andy Putman Oct 14 '16 at 21:48
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    $\begingroup$ I flagged it, and also voted to undelete. $\endgroup$ – Stefan Kohl Oct 14 '16 at 21:54
  • $\begingroup$ @stefan kohl: Thanks! $\endgroup$ – Andy Putman Oct 14 '16 at 22:04
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    $\begingroup$ It's now undeleted. $\endgroup$ – Todd Trimble Oct 14 '16 at 22:57
  • $\begingroup$ Great, thanks to everyone! $\endgroup$ – Andy Putman Oct 15 '16 at 1:29
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    $\begingroup$ You can search for your own deleted posted with the modifier deleted:1, so if it was your answer that is a good way to find it (this is a 10k rep thing, though). Also, in your profile there is a link on the Answers tab of recently deleted answers. $\endgroup$ – Asaf Karagila Oct 15 '16 at 5:56
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    $\begingroup$ Why was it deleted in the first place, though? $\endgroup$ – darij grinberg Oct 16 '16 at 21:30
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    $\begingroup$ The same thing has happened to me, both here and on MSE. One suspects the OP deliberately wanted to get rid of the evidence. $\endgroup$ – Christian Remling Oct 17 '16 at 0:39
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    $\begingroup$ @ChristianRemling I didn't think the asker could unilaterally delete a question that has answers? $\endgroup$ – David Richerby Oct 21 '16 at 21:21
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    $\begingroup$ @DavidRicherby : They can't delete questions that have answers with a positive number of upvotes (maybe above a certain threshold, I don't quite remember). In this case, it was deleted almost immediately after I answered, so before people had a chance to up vote. $\endgroup$ – Andy Putman Oct 21 '16 at 21:38
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    $\begingroup$ @AndyPutman Oh, OK. That seems a rather undesirable "feature". $\endgroup$ – David Richerby Oct 21 '16 at 21:41
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    $\begingroup$ @AndyPutman I think that it should be "with a positive score", not "with a positive number of upvotes" (example: a question with 3 downvotes and 1 upvote has negative score but a positive number of upvotes). $\endgroup$ – Federico Poloni Oct 25 '16 at 12:16

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