I answered this question here about 3 hours ago correctly. The user seems to have deleted the entire thread including my answer.

Is this really what happened and if so, is this behaviour accepted on MSE?


Now it seems the answer has been found. Is there anything that can be done about it? For example can the original question be undeleted?

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    $\begingroup$ Was it possibly this answer instead? That question was deleted. $\endgroup$ – robjohn May 8 '15 at 11:53
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    $\begingroup$ The deleted version. This is not ok. Reasking the same question with exact same wording is "never" ok IMO (for a suitable definition of never). The OP's answer stands at -2. $\endgroup$ – Jyrki Lahtonen May 8 '15 at 11:53
  • $\begingroup$ @JonasMeyer Ok, should I flag for moderator attention? Or not in this case because I already asked a meta post? $\endgroup$ – ナウシカ May 8 '15 at 11:54
  • $\begingroup$ @robjohn Possibly. But it says page not found. $\endgroup$ – ナウシカ May 8 '15 at 11:55
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    $\begingroup$ You can flag the repeat question. Unless you have a link, it may be difficult for you to even locate the older version. Remember: only users with 10000+ rep can "see" deleted threads. Robjohn and I gave the link for the benefit of such users. $\endgroup$ – Jyrki Lahtonen May 8 '15 at 11:56
  • $\begingroup$ @JyrkiLahtonen Yes, impossible for me to locate it. I will go and flag his new post... $\endgroup$ – ナウシカ May 8 '15 at 11:57
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    $\begingroup$ @user213845: since two moderators are commenting here, you probably don't need to flag. $\endgroup$ – robjohn May 8 '15 at 11:57
  • $\begingroup$ @robjohn Okay, I will not flag. $\endgroup$ – ナウシカ May 8 '15 at 11:57
  • $\begingroup$ @robjohn Is it possible for you to undelete the previous question? $\endgroup$ – ナウシカ May 8 '15 at 12:04
  • $\begingroup$ @JyrkiLahtonen I wanted to comment on your comment to the answer in the new question but don't have enough reputation... the result $\|A\|=2$ is correct. I believe he did notice that there are two norms. His answer is similar to mine although slightly more high level and less explicit. $\endgroup$ – ナウシカ May 8 '15 at 12:15
  • $\begingroup$ Would moving user213845's answer to the undeleted question be a reasonable solution here? (At least solution with whih user213845 would be satisfied?) If yes, are moderators able to do such thing? (I know that mods can merge questions. I am not sure, if it is the case for deleted questions, too.) $\endgroup$ – Martin Sleziak May 8 '15 at 12:19
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    $\begingroup$ @user213845: I have undeleted this answer temporarily. As soon as you copy it, I will delete it again. $\endgroup$ – robjohn May 8 '15 at 12:23
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    $\begingroup$ @robjohn Thank you, I copy pasted it. $\endgroup$ – ナウシカ May 8 '15 at 12:30
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    $\begingroup$ Sorry that I wasn't of much help in the end. I got distracted by the question. Mind you, I think $||A||=\sqrt2$ ;-) $\endgroup$ – Jyrki Lahtonen May 8 '15 at 13:51
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    $\begingroup$ @justhalf: As in here? ;-) user213845's answer was copied there all right. They later realized the error, and self-deleted the answer (meaning that 10k+ users can still see it). $\endgroup$ – Jyrki Lahtonen May 15 '15 at 4:59

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