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The purpose of this thread is to help focus the attention of the community on posts that may require reopen and undeletion votes. A request should be posted as an answer below (one request per answer).

Some guidelines:

  • Please be polite, and respect the many different viewpoints in our diverse community. This goes for the person making the request as well as those commenting on it.

  • There is a reopen queue. Please wait until a post has gone through this queue, before posting here. Notice that the first edit after the question is closed pushes the question into the reopen review queue if the edit is done within 5 days of closure, and so does a reopen vote. (If the review has already been finished, it is shown on the timeline of the question.) When in doubt, wait 24 hours after the last substantive action.

  • To inform readers of the current (and past) states of the targeted post, please add the information Reopened or Undeleted at the start once the request has resulted in some action. (If the action is undone, add this too, like Reopened, Reclosed.)

  • Do not only post a request, like "request reopening of link". Instead, make a case for your concern. Yet keep in mind that it can be easier to get your request handled if you try to frame it in a way that takes the feedback the post received into account positively rather then seeking confrontation. Also, try to improve the post before posting here.

  • In case of "small" requests, like one missing vote, it can make sense to ask in chat instead of posting here. The room CURED is a reasonable place for such requests. The same guidelines apply there.

  • If you are involved in the thread which you post about (e.g., you asked the question or you answered it), please disclose this.


Earlier versions of this thread that served as a model:

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    $\begingroup$ I edited the post inspired by a concern expressed in a comment. $\endgroup$ – quid Jul 19 at 23:49

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I nominate to undelete Bijection from a Variety to Itself, Necessarily an Isomorphism?. This question has been deleted by a moderator, so I guess it can only be undeleted by a moderator, too?

The question is interesting and has no apparent issues, as far as I can tell. It is well-formatted and well-formulated. It is no mere problem statement and precisely answerable.

The question has been stated yesterday and when I came back today to see if it got any answers, it was gone.

I honestly can’t tell why it should have been deleted. Although it seems that the questioner has been deleted, so maybe that has something to do with it? (If Asaf Karagila is reading this, would you care to explain your deletion?)

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    $\begingroup$ "If Asaf Karagila is reading this...." Never fear, Asaf is always reading this. It is odd that he deleted the post at 5:25:59, then undeleted it three seconds later, then redeleted it four seconds after that. $\endgroup$ – Gerry Myerson Jul 23 '19 at 13:42
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    $\begingroup$ While we [the moderators] debate the whole thing, you can usually assume that if a moderator deleted a question then there is something deeper going on and some information that you might not be privy to. $\endgroup$ – Asaf Karagila Jul 23 '19 at 15:30
  • $\begingroup$ (Even more so if you notice that the OP has become an ex-account, by the way.) $\endgroup$ – Asaf Karagila Jul 23 '19 at 15:31
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    $\begingroup$ The user who posted the question has also been deleted, which I'm guessing is related to why the question was deleted. Nevertheless I'm disappointed by the deletion of the question--regardless of what was going on with the asker, it is an interesting and nontrivial question. $\endgroup$ – Eric Wofsey Jul 23 '19 at 15:33
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    $\begingroup$ @Eric: I will just comment that we have seen before that holding the quality of a question as a sacred candle which nothing else should extinguish is not a good standard for a functioning community. $\endgroup$ – Asaf Karagila Jul 23 '19 at 15:45
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    $\begingroup$ @AsafKaragila In case you decide to leave the question deleted, please let me know, so I can consider to pose it myself instead. It would also be interesting to hear the reasons if you can disclose that. (Man, this starts to sound like some serious FBI shit or something.) $\endgroup$ – k.stm Jul 23 '19 at 16:00
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Merged

Please Consider undeleting the following question:

https://math.stackexchange.com/questions/3203711/what-are-the-steps-to-finding-int-01-frac-ln1-x-lnxx-dx

Of course, this one is a strict duplicate of the one for it was closed. However, regarding the fact that the answers to this question at all are quite spread I would like to draw attention to my own answer given here collecting some of the possible ways to evaluate this integral within one post.

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    $\begingroup$ Would it make sense to merge the thread with the duplicate target? $\endgroup$ – quid May 4 '19 at 10:11
  • $\begingroup$ @quid That might a better way than undeleting the question, indeed. I'm ashamed to ask, but what exactly does it mean to merge a thread with another one? $\endgroup$ – mrtaurho May 4 '19 at 10:13
  • $\begingroup$ It means that the answers will be moved to the other thread (and deleted on the original one). The Q can be preserved (like a duplicate) or not. $\endgroup$ – quid May 4 '19 at 10:16
  • $\begingroup$ @quid That sounds pretty good. Shall I do this, at least with my own answer, by myself or do I have to request for this somewhere? $\endgroup$ – mrtaurho May 4 '19 at 10:18
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    $\begingroup$ That's something only moderators can do. (Of course you could simply repost your answer on the dupe too, but that would not be merge.) I'll just go ahead and do it now. $\endgroup$ – quid May 4 '19 at 10:23
  • $\begingroup$ @quid Thank you for your time! $\endgroup$ – mrtaurho May 4 '19 at 10:24
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Undeleted and reopened

Please consider reopening the following question:

Evaluation of definite integrals with exponential integrand in Fourier sine transform

OP reduces the problem of finding Fourier sine transform to something that he/she does not know how to proceed further, which can be clearly justified as an attempt. I don't think we should close such post.

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  • $\begingroup$ You ask to reopen, but you write that we shouldn't delete. As you know, closing/reopening and deleting/undeleting are two different things. Presumably, you would like both to undelete and to reopen. May I suggest you edit your post to clarify. $\endgroup$ – Gerry Myerson Apr 27 '19 at 0:22
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    $\begingroup$ @Gerry Myerson: Sure. Edited. Thanks for mentioning that. $\endgroup$ – Jack Apr 27 '19 at 1:46
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    $\begingroup$ @Jack I noticed that after the comment by Gerry you edited the question to only request reopening, but I find this slightly confusing. Shouldn't the post request undeletion instead, since the question is currently deleted? $\endgroup$ – user279515 Apr 30 '19 at 15:29
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Reopened

New user Christophe has made edits which considerably improve this question. Currently, it needs one more reopen vote to remove the hold. Please consider voting to reopen.

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Undeleted, reopened

Please consider undeleting the post:

Reference Request: Proof of H. Steinhaus' Lattice-Point Theorem, created on Mar 11 '17.

This question has two good answers.

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    $\begingroup$ Why don't you people leave these old questions alone? They're really not doing anyone any harm by being left on the site. $\endgroup$ – Gerry Myerson Jul 2 '19 at 3:23
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    $\begingroup$ @GerryMyerson "They're really not doing anyone any harm by being left on the site. " Got debunked numerous times. It's almost hard to believe that you just keep repeating it. To reiterate, not only does precedent get invoked in discussion, users also tend to go by the question they see when deciding how to ask. Of course one can consider this as not enough reason to delete them, but to simply claim "not doing anyone any harm" is just false. $\endgroup$ – quid Jul 9 '19 at 13:48
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    $\begingroup$ On the post generally, at least one might have restored the earlier more complete version. The current version is completely unclear as question, there is arguably more than one result that could be meant. $\endgroup$ – quid Jul 9 '19 at 13:55
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    $\begingroup$ And one more thing @GerryMyerson to refer to a question from 2017 under "these old questions" is rather odd. Discussions about quality of questions were well advanced by then. $\endgroup$ – quid Jul 9 '19 at 14:00
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    $\begingroup$ OK, @quid, I've rolled back to a more complete version. $\endgroup$ – Gerry Myerson Jul 10 '19 at 0:17
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Undeleted, closed, deleted, undeleted, deleted

I think there's a consensus that we undelete questions when they are deleted by the user who posted them after someone else has posted an answer (see, for example, the comment here. In accordance with that consensus, I propose undeletion of this post:

Solutions to $\sum_{j=0}^k r_j^2+3r_j+2\equiv 0 \mod p $

Now I'll own up that I'm the one who posted the answer to the question. My answer was exceedingly terse, and came out of a review with the note, "This does not provide an answer to the question (and so on, and so forth)." But it does provide an answer. The question was to prove or disprove that there are no solutions to a certain equation (congruence, actually, but never mind), and my answer gave a solution.

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    $\begingroup$ Is this actually a consensus? $\endgroup$ – Did Jul 23 '18 at 12:30
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    $\begingroup$ @Did, if you look at the previous edition of this thread, you'll find that in April-May, GNU Supporter posted 4 requests for undeletion, all on the grounds that OP had deleted a question after receiving an answer, and all four questions were undeleted. $\endgroup$ – Gerry Myerson Jul 23 '18 at 12:51
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    $\begingroup$ Yes, and? $ $ $ $ $\endgroup$ – Did Jul 23 '18 at 18:11
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    $\begingroup$ @Did For what it's worth, I have the same impression about the consensus. Preventing an asker from covering up their own question seems to be something the community values, even if it's closed later. $\endgroup$ – user296602 Jul 23 '18 at 18:35
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    $\begingroup$ @T.Bongers (and also Gerry Myerson): I think that there is a moderate consensus that it is bad form to ask a question, get an answer, then delete the question. It belies an ignorance of the functioning of the site (i.e. questions are supposed to be helpful to everyone, not just the one person asking the question). However, in this particular case, the question is of pretty low quality, and should be closed and deleted (in my opinion). It seems like a waste of resources to have opened it back up again... $\endgroup$ – Xander Henderson Jul 23 '18 at 19:00
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    $\begingroup$ For what it's worth, I have expanded my answer to the question on main. $\endgroup$ – Gerry Myerson Jul 24 '18 at 0:34
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    $\begingroup$ "For what it's worth, I have expanded my answer to the question on main." On this topic, my understanding is that the consensus is that a good (or even great) answer is not really enough to justify keeping a poor question around. This and this are relevant. $\endgroup$ – Xander Henderson Jul 24 '18 at 13:27
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    $\begingroup$ @Xander, the highest-voted answers and comments on your first link hardly support your understanding. The second link, even there there is considerable support for not deleting questions with good answers. I'm not convinced there is, was, or ever will be a consensus on this issue. A majority, maybe, but no consensus. $\endgroup$ – Gerry Myerson Jul 24 '18 at 21:31
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    $\begingroup$ @GerryMyerson I think you and I must be reading very different answers. In answer to the question of whether bad questions with good answers should be preserved, my reading of the top three answers ((1), (2), (3)) suggest that it might be worth protecting a poor question if it hosts an excellent answer. $\endgroup$ – Xander Henderson Jul 24 '18 at 22:54
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    $\begingroup$ On the question of upvoting poor questions with good answers, the top voted answer is this one, essentially "I don't do it, but there could be an argument in favor of it." The second answer is similar, with the idea being that a good answer should be preserved if it might be helpful for others in the future. $\endgroup$ – Xander Henderson Jul 24 '18 at 22:55
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    $\begingroup$ In both cases, it seems clear to me that the consensus is that it might be reasonable to preserve a poor question if it attracted a really good, useful, generally helpful answer. Again, a good answer (or possibly even a great answer) is not, by itself, enough to preserve a poor question. $\endgroup$ – Xander Henderson Jul 24 '18 at 22:58
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    $\begingroup$ Finally, I note that I made my initial comment in response to your assertion that you have improved your answer. Are you further asserting that the improvements created something that is of such lasting value that it will be beneficial beyond asking that poor question? Despite the fact that this question and answer have been the topic of discussion here for a couple of days, your answer has not attracted any upvotes... $\endgroup$ – Xander Henderson Jul 24 '18 at 22:59
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    $\begingroup$ @Xander, I'm not in it for the upvotes. I objected to a user posting a question and then deleting it when it got an answer, as I agree with a moderator that such an action is an abuse of the site. Once the question was undeleted, I took the opportunity to improve my answer, in response to a comment from another user. What's wrong with that? I'm not asserting anything about the lasting value of the question or the answer, other than the answer being fuller now than it was. The answer may help someone coming along who is interested in sums of two squares modulo a prime. Fire away. $\endgroup$ – Gerry Myerson Jul 24 '18 at 23:30
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    $\begingroup$ @GerryMyerson: it isn't pleasant to see one's own answer deleted, but in this case the question is clearly not up to many users' standards, so I think it is not surprising to see it deleted. At this point, the question is no longer deleted by the OP, but by several other users. $\endgroup$ – Carl Mummert Aug 5 '18 at 21:06
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    $\begingroup$ @Carl, it isn't pleasant to see any answer with nonzero mathematical content deleted. More to the point, I would not have put the question up for undeletion, had it been deleted by votes of users. My objection was to OP abusing the site by deleting the question after getting an answer. I thought that was clear. $\endgroup$ – Gerry Myerson Aug 5 '18 at 23:09
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Reopened

This question asks about the existence of a series $f_i$ of complex functions with several properties: there should exist $x_0$ such that $f_i(x_0) = i$; the sum of the series should converge on some open region to a function $f$; the analytic continuation of $f$ should exist at $x_0$.

It has attracted several answers, some quite detailed, but has been closed as being “not about mathematics”.

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Undeleted.

Please consider undeleting this post: Help with proof of set theory.

The question asks for clarification of some details in a previous answer of mine. (In a perhaps poorly phrased manner, saying that it seemed there was an error and so the answer was meaningless.)

I took the time to ask in comments for the poster to clarify what precisely was confusing. Then I posted an answer with some additional details.

The poster proceeded to delete all their comments and the question, which I think is poor manners. The question is not terrible, and it may be useful to others.

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  • $\begingroup$ "Reopened"? Shouldn't that be "Undeleted"? $\endgroup$ – Gerry Myerson Jan 30 at 20:25
  • $\begingroup$ Yes it should. 🙂 $\endgroup$ – Andrés E. Caicedo Jan 30 at 20:35
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Reopened

Consider this question: Find the height of a bar, given the lengths of shadows cast by it and another bar

It is closed as a duplicate of a question that is closed with the missing context reason, with no attempt and only one answer. The question I linked has an attempt and the question and many answers are highly upvoted, yet people are voting to delete it, presumably because it's a duplicate. It will require 10 delete votes.

I think we should reopen this question and close the other question as a duplicate of this one. Afterwards, if people are really so thirsty for deletion, they can delete that one.

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Undeleted, Reopened

Please undelete and reopen If $AB\parallel DC$, $BC\parallel AD$, and $AC\parallel DQ$, find $\Bbb X$ in terms of the areas $\Bbb A$, $\Bbb B$, and $\Bbb C$. (the asker showed attempts as discussed in the META question here). More context has been added.

Let it be known that I answered the question. This information seems unnecessary. My answer is there when you open the link (and you have to, if you want to decide whether to reopen/undelete the question). Why do users insist on having this information disclosed, even if the information is public? Whether you want to reopen/undelete a question should depend on your opinion on the question and answers there, and not on the person who asked the question or who answered the question.

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  • $\begingroup$ We note that user Batominovski has posted an answer to the question. $\endgroup$ – Gerry Myerson Jul 4 at 6:52
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    $\begingroup$ @GerryMyerson I am not sure why this seems to be an issue. Many users here also requested questions they have answered to be reopened/undeleted. I can make my answer a community wiki post if that is a problem. $\endgroup$ – Batominovski Jul 4 at 6:58
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    $\begingroup$ No need to go community wiki, just be transparent when you have an interest in a question, please. $\endgroup$ – Gerry Myerson Jul 4 at 7:11
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Undeleted, Reopened

Please undelete the following: How many ways can I go from 1 to 10 in the following diagram?

This question has an answer (mine) with more than $50$ votes. The question should stay closed, as it did not follow MSE guidelines, but the highly voted answer is very good.

The question now has more context and pictures.

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    $\begingroup$ "How many undelete votes does this question have?" (added in your recent edit). If I count correctly, it took five users to deleted the question, so five votes to undelete should be necessary too. This is in accordance with the description in the FAQ, you have 5+51=56 (questions + top-voted answer), ratio 20:1 gives two additional votes. $\endgroup$ – Martin Sleziak Jul 13 at 12:42
  • $\begingroup$ @MartinSleziak Thanks! $\endgroup$ – Culver Kwan Jul 13 at 12:43
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    $\begingroup$ @Culver I think it would be a good idea to edit the question to improve it yourself, so that it doesn't get deleted again. You could just add something to the question to say why it's interesting. The question is the best part of a year old, so we can safely assume that the OP isn't going to improve it themselves... $\endgroup$ – user1729 Jul 14 at 15:38
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    $\begingroup$ (Also, for questions like this it makes more sense for the question to contain an explanation of why we should care about it, rather than containing some half-hearted attempted at a solution. I mean, you want this to be kept open for posterity, right? But noone in the future is going to care about the OPs "attempt"!) $\endgroup$ – user1729 Jul 14 at 15:48
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Undeleted

May I request that this old question GCD of $n^a\,\prod\limits_{i=1}^k\,\left(n^{b_i}-n\right)$ for $n\in\mathbb{Z}$ of mine be undeleted? The deletion was done by an automatic system (if that is the case, can it be voted to be undeleted?). I am certain that the question is well written with a lot of context. I would like to put a bounty on the question.

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    $\begingroup$ It can be undeleted, but it will just be deleted again unless it gets an upvote or an upvoted answer. (There may be other conditions that would prevent it from being deleted, I'm not an expert.) $\endgroup$ – Matt Samuel Jul 15 at 16:37
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    $\begingroup$ @MattSamuel Perhaps, having a bounty is such a condition. I am planning to offer a bounty on the question anyhow. Let's see if that is the case. (Thanks for your votes. You have been a tremendous help. And Zacky too!) $\endgroup$ – Batominovski Jul 15 at 16:39
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    $\begingroup$ @Batominovski Your guess is right, questions with an active bounty will not be deleted by Roomba while the bounty is active — see this on Meta SE. $\endgroup$ – user279515 Jul 15 at 17:58
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Reopened, Deleted by spam flag, Undeleted

Please consider reopening this question which is asked by a newbie which obviously did not know how to ask a good question. After the closure they had edited to include their efforts, and I have fixed the formatting.

The reopening review task was completed just a while ago.

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  • $\begingroup$ Somehow the question got flagged as spam. $\endgroup$ – Matt Samuel Sep 15 at 19:21
  • $\begingroup$ I thought it's automatic deleted (by the script here) @MattSamuel $\endgroup$ – Arctic Char Sep 15 at 19:31
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    $\begingroup$ The history does say it was deleted by RemoveDeadQuestions, however if you look at the text of the post it says it was marked as spam as well. $\endgroup$ – Matt Samuel Sep 15 at 19:38
  • $\begingroup$ I can't see that @MattSamuel (I have <10k rep, so I guess I might see less information). $\endgroup$ – Arctic Char Sep 15 at 19:41
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    $\begingroup$ The flag is for "spam or rude/abusive" content, but here the only rudeness is the terse initial phrasing in the imperative "solve it". I scarcely think this is abusive. If the subsequent edits are taken into account, the Question is suitable in my opinion, so I'm voting to undelete. $\endgroup$ – hardmath Sep 15 at 20:34
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    $\begingroup$ Without more upvotes it will just be deleted again. It needs at least a score of $0$ to make it through tonight. $\endgroup$ – Matt Samuel Sep 15 at 22:39
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    $\begingroup$ Maybe someone could post an answer, as the question is currently open and not deleted. $\endgroup$ – Gerry Myerson Sep 15 at 23:30
  • $\begingroup$ Still waiting for someone to post an answer, also waiting for OP to correct the typo I pointed out (if it is, in fact, a typo). $\endgroup$ – Gerry Myerson Sep 26 at 1:02
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Please consider undoing the duplicate votes here. The duplicate target is quite different as it asks for algorithms while this questions asks for easy ways to calculate determinant (so that careless errors are less likely to commit). The duplicate target is a poor question without context (though with some decent answers).

FYI: It failed the reopening review five times before, as of 3rd Sept. 2018.

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    $\begingroup$ Two points: 1. did you ask the user that put it on hold as duplicate about it? 2. It seems that the answer on the dupe target includes the answer on the original question. // Personally I think the answer given on this question is pretty much besides the point. And the question is very localised. Long story short. I'd delete post. $\endgroup$ – quid Sep 3 '18 at 11:59
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    $\begingroup$ @quid: I didn't (I thought this case is obviously wrong, and it had 4 reopen votes already). I agree that the question is localised and deletion is also a good choice. $\endgroup$ – user99914 Sep 3 '18 at 15:21
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Reopened

Please, consider reopening this question.

The question was somewhat unclear when first asked, but was pinpointed down in comments. I also edited it providing a figure which helps to readily understand the situation.

The context provided by OP (by means of the "planified" picture) makes the source of confusion clear, and now that the problem itself is also clear, I think it fits the site well.

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Undeleted, redeleted, undeleted again, reopened

Statements that look obviously false but cannot be disproved. is at $+15$, and has answers at $+7,+10,+14,+20,+21,+8$, and $+15$. Please consider voting to undelete. [In the interests of transparency, I note that the $+15$ answer is mine.]

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    $\begingroup$ I agree that the question is highly upvoted and has highly upvoted answers. That does not make it an appropriate question for MSE. With regard to what is on-topic, it isn't a problem or puzzle, and I see no clear indication that there is a particular topic that needs to be clarified. With respect to what not to ask, the question seems designed to engender discussion, not to seek explanation. $\endgroup$ – Xander Henderson Sep 27 '18 at 16:35
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    $\begingroup$ For the benefit of the people who cannot see deleted questions, I'll add that this MO question is mentioned in comments: The most outrageous (or ridiculous) conjectures in mathematics. (Even if this one does not get undeleted, the linked MO post might be interesting for people who would consider Statements that look obviously false but cannot be disproved interesting.) $\endgroup$ – Martin Sleziak Sep 28 '18 at 8:42
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    $\begingroup$ @XanderHenderson Just curious, what would you then consider as on-topic for the soft-question and big-list tags? $\endgroup$ – dxiv Oct 4 '18 at 5:51
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    $\begingroup$ Surely we have better things to do that relitigate this post over and over again, and remove the collective efforts of 16 people. I see no harm from the existence of this post, except for the ruffled feathers of people who are inclined to overmoderation. $\endgroup$ – user296602 Oct 4 '18 at 22:13
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    $\begingroup$ In my opinion, if some want content and others do not then it should stay. The veto should be over removal rather than the converse. I will never understand why it's so important to wreck somebody else's party. $\endgroup$ – samerivertwice Dec 1 '18 at 18:22
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Reopened

I request a reopen of Are the corner hypercubera polytopes self-dual?. The question provides a v-definition of an infinite family of polytopes, and asks whether each member of this family is self-dual. (I don't see anything unclear about this question.) Other than being closed for being unclear, I haven't received feedback on this question.

I believe this Q&A provides the first known example of an infinite family of self-dual polytopes that is not a set of k-fold pyramids over a self-dual polytope.

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    $\begingroup$ The post reads as a blog post, not a question. It needs to be vastly more concise, and I frankly don't think that MSE is a good site to ask questions like this; you would do better just talking to someone in the field. You got a bit of feedback in your last meta post. $\endgroup$ – user296602 Oct 1 '18 at 23:20
  • $\begingroup$ Thanks for replying. I agree that a tag pertaining to just a question or two need not exist. As to the question, 1/3 of it is motivation, which I understand to be a requirement of MSE (I would just as soon leave it out). The answer is long because, while conceptually simple, the proof has a lot of tedious parts to it. $\endgroup$ – Dan Moore Oct 2 '18 at 0:35
  • $\begingroup$ I've made my question more concise-it's now about 1160 characters & fits on my small Mac screen. My answer is about 18,000 characters. To analyze why it's so long, I counted the characters in eight distinct parts of the answer. Some parts are long because the thing to be proved requires a lot of words (wishing there was an elegant proof doesn't make it so). $\endgroup$ – Dan Moore Oct 2 '18 at 23:56
  • $\begingroup$ Strictly speaking, the question was closed, not the answer. The Q&A is good because it sets forth the first example (ever in the history of mankind) of an infinite family of self-dual geometric polytopes (one for each dimension d $\ge$ 3) which aren't a set of k-fold pyramids over a self-dual polytope. $\endgroup$ – Dan Moore Oct 3 '18 at 0:00
  • $\begingroup$ I've improved my answer by adding headings, allowing the reader to more easily navigate or skim the answer. $\endgroup$ – Dan Moore Oct 7 '18 at 15:47
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Undeleted.

I nominate Is the numerical range of Identity operator convex? for undeletion because the question asker self-deleted her question shortly after receiving an answer from a high-rep user. That's an abuse of the system.

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Reopened.

This recent Question asks about a variant of the Secretary Problem which as far as I can tell has not been previously answered here.

I mistakenly proposed to close as a duplicate of the classic Secretary Problem, but this variant treats as equally successful the choice of either the best or the second-best candidate. Please consider adding your vote to reopen to mine.

[NB: I edited the title of the post to clarify that this is not identical to the earlier Question, and I discuss in the comments there what little Math.SE discussion there had been on this variant (without supplying its literature references).]

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    $\begingroup$ I've edited the question to refine the formatting and grammar a bit, and to use more gender neutral language. I don't think that the question is all that great (it is a problem statement question with a largely nonsensical "attempt"), but I agree that it isn't a duplicate question, and it is somewhat better than much of the stuff that gets posted. In any event, the question is now open again. $\endgroup$ – Xander Henderson Nov 27 '18 at 2:27
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Undeleted

I nominate Is the Balazard-Saias-Yor integral non-positive? for un-deletion and re-opening. Being self-deleted by a deleted user, it has a score of +1 and two stars. The topic adds value to the site and the question asker has put effort in the post.

Currently, only one undelete vote is needed to undelete this question. I hope the two users who starred this question can see their favorite question re-opened.

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    $\begingroup$ It should be noted that "stars" do not necessarily indicate that a user finds the question useful or up to the standards of the site. Many users use stars to keep track of questions with which they have interacted, and desire to return to at some point. For example, I sometimes star questions which lack context or otherwise fail to meet the standards of this site. After downvoting, leaving a comment, and/or voting to close, I will star the post so that I can return to it a few days later to see if it has been improved. If it has, I'll retract my downvote and/or close vote. $\endgroup$ – Xander Henderson Feb 4 '19 at 17:02
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    $\begingroup$ I'm not saying that this is the case here; I just want to point out that "stars" should not be taken as a sign of quality vis-a-vis undeletion votes. $\endgroup$ – Xander Henderson Feb 4 '19 at 17:03
  • $\begingroup$ @XanderHenderson Thx for comments. Noted. $\endgroup$ – GNUSupporter 8964民主女神 地下教會 Feb 5 '19 at 1:27
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Undeleted, closed, deleted, re-undeleted, reopened

I nominate How to use derivatives to prove that $f(x)=2\cos^2\left(\frac{\pi }{4}-\frac{x}{2}\right)-\sin \left(x\right)=1$? for undeletion since OP has self-deleted his/her question after receiving an answer. This is unacceptable on Math.SE.

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  • $\begingroup$ It's better to write self-contained posts. In the current case for the moment there was no big risk, but it's still not ideal. $\endgroup$ – quid Nov 8 '18 at 19:42
  • $\begingroup$ @quid Thanks for your intervention. I'll correct this now. $\endgroup$ – GNUSupporter 8964民主女神 地下教會 Nov 8 '18 at 19:44
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    $\begingroup$ I don't understand why this question was closed and deleted by users. It is not unclear what they're asking. (It may not be true, but it is certainly clear!) $\endgroup$ – user1729 Feb 5 '19 at 11:28
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    $\begingroup$ @user1729 Some users don't like wrong info in the question. They have standards so high that $D(\sin x)$ and the RHS of $f'(x)$ doesn't please them. It's possible that they used their power to get rid of this question. $\endgroup$ – GNUSupporter 8964民主女神 地下教會 Feb 5 '19 at 11:37
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    $\begingroup$ It's definitely not unclear—the questioner gives the problem, shows what they did, and asks what's wrong with it. I think it could do with an additional answer which makes crystal clear what the error was and how the (interesting!) technique works, and reopening would allow someone to post that. $\endgroup$ – timtfj Feb 5 '19 at 12:06
  • $\begingroup$ @timtfj It's now reopened. $\endgroup$ – GNUSupporter 8964民主女神 地下教會 Feb 5 '19 at 16:04
  • $\begingroup$ @GNUSupporter8964民主女神地下教會 At least it's clear that their expectations could never rise to match the size of your assumptions... $\endgroup$ – Lord_Farin Feb 6 '19 at 17:34
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Undeleted and merged with duplicate

I would like to see the question "Finding sum to infinity" undeleted. The OP says that they "tried using the Taylor series for $e^x$ but couldn’t figure out how to manipulate it to get the above expression", which seems reasonable. Moreover:

  1. The question is a duplicate and is closed as such. It is not standard practice to delete duplicates (see here).
  2. The question itself is on +5 (+6/-1), and one of the answers is on +12.
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    $\begingroup$ I don't get the argument. What is the value of keeping that question on the site? $\endgroup$ – quid Feb 15 '19 at 19:00
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    $\begingroup$ I didn't realiize that "it is standard practice to not delete duplicates." Cite? $\endgroup$ – Gerry Myerson Feb 16 '19 at 4:06
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    $\begingroup$ @GerryMyerson I also had entertained to comment on that. What arguably is true is that "it is not standard practice to delete duplicates", which of course is not quite the same. $\endgroup$ – quid Feb 16 '19 at 12:14
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    $\begingroup$ @Gerry What I meant was "a question should not be deleted simply because it is a duplicate" (so I've edited the post to quid's sentence). This was discussed here. $\endgroup$ – user1729 Feb 18 '19 at 11:28
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Undeleted

I nominate Factorising the ideal $(14)$ in $\mathbb{Q}(\sqrt{-10})$ into a product of prime ideals. for undeletion since the question asker has self-deleted his/her own question after receiving an answer. This is unfair the answerer who spent time and effort writing the answer, which deserves evaluation from the community.

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Reopened, closed again as duplicate

I nominate reopening Non-negative integer solution for $ax + by = c$. The OP updated the question with what I consider to be sufficient context after the first close vote, but before the final one. As I thought the updated text then made it an appropriate question, I provided an answer. After I discovered it was closed, I flagged it for reopening, but this was declined. FYI, the full timeline is here. Please check this question to see if it should be reopened. Thanks.

Update: As explained in the comments, the question is really a duplicate. It's now closed again for what I consider an appropriate reason, i.e., as a duplicate.

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    $\begingroup$ It's a duplicate of math.stackexchange.com/questions/490602/… and probably several others. If it's reopened, it should immediately be closed as a duplicate. $\endgroup$ – Gerry Myerson May 28 '19 at 6:37
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    $\begingroup$ @GerryMyerson I appreciate your feedback. Since it's a duplicate, I don't have any problem with closing it as such (if it's first reopened), and will even vote to do so. $\endgroup$ – John Omielan May 28 '19 at 6:44
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    $\begingroup$ @GerryMyerson I just gave the last vote to reopen the question. To follow through on what I stated above, I then tried to vote to close as a duplicate. However, because I gave a vote to close on April 18 and then retracted it (due to the OP giving more context so I thought it shouldn't close), the system won't let me vote to close it again, even though it's gone through a close/reopen cycle. As such, perhaps you may wish to start the process of closing it now as a duplicate. Thanks. $\endgroup$ – John Omielan Jun 1 '19 at 3:09
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Reopened

Please consider reopening Does knowing the surface area of all faces uniquely determine a tetrahedron?. This is a very natural and self-motivating question that does not need any additional context, and it's gotten several great answers.

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Reopened

Please consider reopening this post, suitably narrowed since originally closed as "too broad":

Book recommendation... Linear Programming for self-study

I don't believe there has been another such request, and under my pestering the OP has provided context for what sort of self-study they've previously undertaken.

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Reopened

Please consider reopening Does non-uniqueness of solution to 1st order ODE implies the existence of infinitely many solutions?.

This is an interesting question about a not so famous result in ODE. The answers points to the correct reference. I've edited the question to include more context.

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    $\begingroup$ I agree it's an interesting question, and the updated text now has enough context, so I initiated reopening it. $\endgroup$ – John Omielan Jun 18 '19 at 16:36
  • $\begingroup$ @JohnOmielan, if you care, please consider also editing the answer there (to rollback to edit 1). Now that the post is reopened, there is no need for that comment. I tried to edit myself, but the suggested edit got rejected $\endgroup$ – Arctic Char Jun 19 '19 at 19:20
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    $\begingroup$ I agree the comment there regarding it being closed is no longer pertinent, so I did rollback of the edit. $\endgroup$ – John Omielan Jun 19 '19 at 19:26
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Undeleted (and edited the duplicate target)


Please undelete this post:

Three coins are tossed. If one of them shows a tails, what is the probability that all three coins show tails?

This question was marked as a duplicate to another question (created 2014) that was closed and deleted (2018).

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    $\begingroup$ It seems it took 9 votes to delete this question. I suppose that's because it had 30 upvotes? Anyway, currently it has 7 undelete votes. Does it need 9 to undelete? $\endgroup$ – Gerry Myerson Jul 5 '19 at 5:52
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Undeleted, reopened

Please consider undeleting and reopening this post:

How does one prove the inequality $1+|x|\le (1+|y|)(1+|x-y|)$?

OP clearly indicated the context of his/her question: it is from a proof in Wolff's lecture notes on harmonic analysis.

[Added upon request: this post has also been edited into a (more) decent one.]

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    $\begingroup$ If you edit a post significantly indicate so in the request. I have no problem with it by itself, but since such actions are quite frequently overlooked by observers it can lead to the false impression that a relatively decent post was deleted. $\endgroup$ – quid Jul 8 '19 at 14:07
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    $\begingroup$ @quid If someone else (not OP) edits OP's question to make the question 'fit' on MSE, then does the question gets reopened or undeleted always? $\endgroup$ – allesia_b Aug 9 '19 at 18:48
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    $\begingroup$ I said different by OP because sometimes the question is old, say 2015, and OP hasn't visit MSE since 2015. $\endgroup$ – allesia_b Aug 9 '19 at 18:51
  • $\begingroup$ @Isa I'd say yes for the most part (although what 'fit' mean of course leaves room for interpretation). That said, some users do not like the practice, thus there can also be push back. But in abstract and as a general principle (there can be exceptions in special cases) if a question is a good fit for math.se we usually keep it around no matter how it arrived in this state.// If you want to discuss this in more detail please open a separate thread. $\endgroup$ – quid Aug 9 '19 at 19:32
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Undeleted, reopened, closed

Please consider undeleting this post:

How to find ${\large\int}_1^\infty\frac{1-x+\ln x}{x \left(1+x^2\right) \ln^2 x} \mathrm dx$?

This is not a trivial exercise and OP shows his/her thoughts that "Routine textbook methods for this complicated integral fail." It has several very well-written detailed answers with rather high number of upvotes.

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    $\begingroup$ '[S]hows his/her thoughts that "Routine textbook methods for this complicated integral fail."' That's not relevant context. Most likely it's a constructed challenge and should have been declared as such. This type of post borders on a misuse of the site. The following comment at score 13 is relevant I feel like it's becoming a trend to ask questions about practically impossible integrals. $\endgroup$ – quid Jul 8 '19 at 19:34
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    $\begingroup$ You think "That's not relevant context." And this proposal focus particularly on undeleting the post. Considering THREE high-quality answers (4+31+40 upvotes) that already existed I find it ridiculous (yes, this is my rant) to delete this OLD post. If there is any misuse of this site at all, the deletion, in this particular case, IS misuse of the privilege of votes. [mod redacted] $\endgroup$ – Jack Jul 8 '19 at 19:58
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    $\begingroup$ Bringing up other users in this form is out-of-line, in general. In the specific case it's also highly misleading. (I removed it.) $\endgroup$ – quid Jul 8 '19 at 20:24
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