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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.

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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
    Commented Jul 19, 2020 at 23:49

189 Answers 189

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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
    Commented May 4, 2019 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
    Commented May 4, 2019 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
    Commented May 4, 2019 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
    Commented May 4, 2019 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
    Commented May 4, 2019 at 10:23
  • $\begingroup$ @quid Thank you for your time! $\endgroup$
    – mrtaurho
    Commented May 4, 2019 at 10:24
3
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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, Reclosed as a duplicate.

I found this question sufficiently non-trivial.

Given that the series of positive numbers $\sum_n a_n$ converges, can we say anything about the convergence of $\sum_n a_n^{(n-1)/n}$?

So, as a salvage effort I added some preliminary thoughts to it. Do check whether it now is good enough to be undeleted and/or reopened?

I'm not saying it would now be a great question. This is also a way of repeating my old maxim that the interested parties should always try and edit closed/deleted questions they find interesting into shape, and only after that ask others to reconsider.

Caveat: I didn't feel the need to check for duplicates. So it is possible that it should later be closed and redeleted as a dupe. Not entirely unexpectedly Martin Sleziak found no less than three near duplicates: 1, 2 and 3.

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  • $\begingroup$ I'm happy with the current status (closed as a duplicate). $\endgroup$
    – Jyrki Lahtonen
    Commented Oct 28, 2019 at 6:34
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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
    Commented Jan 30, 2020 at 20:25
  • $\begingroup$ Yes it should. 🙂 $\endgroup$
    – Andrés E. Caicedo
    Commented Jan 30, 2020 at 20:35
3
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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 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
    Commented Jul 13, 2020 at 12:42
  • $\begingroup$ @MartinSleziak Thanks! $\endgroup$
    – Culver Kwan
    Commented Jul 13, 2020 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
    Commented Jul 14, 2020 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
    Commented Jul 14, 2020 at 15:48
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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
    Commented Sep 15, 2020 at 19:21
  • $\begingroup$ I thought it's automatic deleted (by the script here) @MattSamuel $\endgroup$
    – Arctic Char
    Commented Sep 15, 2020 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
    Commented Sep 15, 2020 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
    Commented Sep 15, 2020 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
    Commented Sep 15, 2020 at 20:34
  • 1
    $\begingroup$ 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
    Commented Sep 15, 2020 at 22:39
  • 1
    $\begingroup$ Maybe someone could post an answer, as the question is currently open and not deleted. $\endgroup$
    – Gerry Myerson
    Commented Sep 15, 2020 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
    Commented Sep 26, 2020 at 1:02
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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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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
    Commented Oct 1, 2018 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
    Commented Oct 2, 2018 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
    Commented Oct 2, 2018 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
    Commented Oct 3, 2018 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
    Commented Oct 7, 2018 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 Mod
    Commented Nov 27, 2018 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 Mod
    Commented Feb 4, 2019 at 17:02
  • 3
    $\begingroup$ 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 Mod
    Commented Feb 4, 2019 at 17:03
  • $\begingroup$ @XanderHenderson Thx for comments. Noted. $\endgroup$
    – GNUSupporter 8964民主女神 地下教會
    Commented Feb 5, 2019 at 1:27
2
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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
    Commented Feb 15, 2019 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
    Commented Feb 16, 2019 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
    Commented Feb 16, 2019 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
    Commented Feb 18, 2019 at 11:28
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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
    Commented Apr 27, 2019 at 0:22
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    $\begingroup$ @Gerry Myerson: Sure. Edited. Thanks for mentioning that. $\endgroup$
    – user9464
    Commented Apr 27, 2019 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
    Commented Apr 30, 2019 at 15:29
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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
    Commented May 28, 2019 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
    Commented May 28, 2019 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
    Commented Jun 1, 2019 at 3:09
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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
    Commented Jun 18, 2019 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
    Commented Jun 19, 2019 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
    Commented Jun 19, 2019 at 19:26
2
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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
    Commented Jul 5, 2019 at 5:52
2
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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
    Commented Jul 2, 2019 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
    Commented Jul 9, 2019 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
    Commented Jul 9, 2019 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
    Commented Jul 9, 2019 at 14:00
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    $\begingroup$ OK, @quid, I've rolled back to a more complete version. $\endgroup$
    – Gerry Myerson
    Commented Jul 10, 2019 at 0:17
2
$\begingroup$

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
    Commented Jul 23, 2019 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 Mod
    Commented Jul 23, 2019 at 15:30
  • $\begingroup$ (Even more so if you notice that the OP has become an ex-account, by the way.) $\endgroup$
    – Asaf Karagila Mod
    Commented Jul 23, 2019 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
    Commented Jul 23, 2019 at 15:33
  • 4
    $\begingroup$ @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 Mod
    Commented Jul 23, 2019 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
    Commented Jul 23, 2019 at 16:00
2
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Reopened

Prove: there exists 3 sets: $A, B, C \subseteq \mathbb{N}$ such that: $A\cap B\cap C =\emptyset$ and $|A|=|B|=|C|=\aleph_0$?

Please consider reopening my question as I've edited it in order to explain the full context of it.

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    $\begingroup$ The current status is only to be added after a change occurred. In any case it should always be the current status of the post not the requested action. $\endgroup$
    – quid
    Commented Aug 15, 2019 at 13:19
  • $\begingroup$ I understand. thank you for the help $\endgroup$
    – Noa Even
    Commented Aug 15, 2019 at 13:20
2
$\begingroup$

Reopened

Please consider reopening Minimal surfaces under conformal parametrizations - proof verification

It appears to have been closed after the user vandalised their question (rolling back the question would seem like the better approach, which I've done) and appears to have plenty of context and be a reasonable question asking for help.

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2
$\begingroup$

Reopened

Could we please reopen: How might I define a parabola in vertex form, such that…

The OP has made an effort to improve their question. They have clarified the question by including the vertex form of a parabola for future reference, and have also added MathJax to the question. I have also cleaned up the tags to better reflect the question ('linear-algebra' was not appropriate).

The question is perfectly clear, and the OP has given the background to their own question which makes it perfectly answerable.

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    $\begingroup$ I have voted to reopen, but I note that the question already has an accepted answer. $\endgroup$
    – Gerry Myerson
    Commented Oct 12, 2019 at 6:47
2
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Undeleted

The following answer was deleted:

https://math.stackexchange.com/a/1409573/10513

and I believe it should be undeleted.

The question is rather old (2013). The context of the question is that they are reading a research article which states a result, and the question is asking for a proof of this. Each of the other answers gives a citation rather than a proof. This specific answer is the same (citation, no proof), but the citation given is a modern, standard text and it makes sense for this book to be mentioned in some answer.

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Reopened

Please consider voting to reopen this question:

Peak response of second order system with rectangular pulse input

The OP has improved it a lot.

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Reopened

Please reopen

The question is clear and natural to ask. It asks whether the characteristic polynomial of a matrix is a polynomial or a polynomial function. One common definition makes it look like the latter.

(Note that quantum groups are not groups and trigonometric polynomials are not polynomial in the usual sense).

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    $\begingroup$ It's considered good manners to indicate, when requesting a reopening, that you've provided an answer to the question yourself :) $\endgroup$
    – postmortes
    Commented Apr 21, 2020 at 10:20
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    $\begingroup$ @postmortes, thanks for the info, i didn't know it was relevant. $\endgroup$
    – Alexey
    Commented Apr 21, 2020 at 12:31
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    $\begingroup$ Generally if there's a benefit to someone personally by having the question-status changed (typically, they'll gain reputation from it) people here like that stated up front :) $\endgroup$
    – postmortes
    Commented Apr 21, 2020 at 12:34
  • $\begingroup$ @postmortes, i was ignorant of the personal benefit... I didn't know or forgot that answers to closed questions cannot be upvoted. $\endgroup$
    – Alexey
    Commented Apr 21, 2020 at 19:14
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Reopened

The question $\sum_{n=1}^{p-1}{\frac{1}{n}} = \frac{A_p}{B_p}$ What is $A_p$ (mod $p^2$) where $\frac{A_p}{B_p}$ is a reduced form fraction? is closed as a duplicate of Proof of Wolstenholme's theorem, but perhaps this was a bit hasty. Quoting from the OP's update:

It's been suggested that Wolstenholme's theorem can be used to finish the proof. The connection between the problem here and Wolstenholme's theorem is interesting so I will try to study Wolstenholme's theorem. However, it doesn't seem like a likely path to have taken from where I'm at in my understanding. I'm also skeptical Silverman had intended for the audience of his book to discover Wolstenholme's theorem as a lemma to proving that $𝐴_p$ is $0$ (mod $p^2$).

Based on this, I have added the tag to it.

Can the question be reopened?

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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
    Commented Jul 15, 2020 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
    Commented Jul 15, 2020 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
    Commented Jul 15, 2020 at 17:58
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Reopened

Please consider this question Some Combinatorics and Some Prime Numbers to be reopened. This was posted by me seeking for other solutions rather than mine. I think it's well explained.

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  • $\begingroup$ Please follow the guidelines in posting here. In particular this (quote): 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.) $\endgroup$
    – Arctic Char
    Commented Jul 22, 2020 at 9:36
  • $\begingroup$ Okay, thanks! I got it. $\endgroup$
    – ShBh
    Commented Jul 22, 2020 at 9:39
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