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Mod-deleted This question has recently been undeleted. I have to admit that I'm stunned. There is nothing good about this Q&A: the questions consist a homework dump from a timed online quiz; they have apparently been copy-pasted here without any effort done to even format them correctly (the sentence "Answer both parts for full credit" is ...


22

This continues to be a divisive issue with neither side willing to compromise at all. Mathematicians being idealists of the purest kind that is hardly a surprise. I am somewhat impressed by the fact that hardly anyone is bringing up reputation in this discussion. In spite of our love/hate relationship with these internet points the rep game is a strong ...


19

There should be some continuity to the content of a post; an edit should be an edit, not a new post in the same box. Thus, if the second answer is completely different from the first I would go for a new post. If there are only major changes, but there is still some continuity an edit seems appropriate. It is not completely clear to me what was the case ...


19

If a question gets undeleted, the user who posted gets no notification about that undeletion. But you also get no notification if an answer of yours gets deleted. The only thing that happens (as you were told in the comments) is that that deletion or undeletion may cause a change in your reputation. Whether a user should get a notification under those ...


18

Moderators can undeleted comments that were not deleted by the users. Namely, if you posted a comment and you deleted it, then moderators cannot undelete it. If, on the other hands, a moderator deleted the comment, then they can be undeleted by moderators. The problem is that you don't have access to deleted comments, so you can't quite edit them, or ...


17

I don't think we have, or should have, an official policy. To some extent this is a question of how much did you end up changing. If the correction is minor, by all means, edit and undelete. If the correction is an entirely different argument, I'd think it's a bit disingenuous to keep your votes from before, in some sense. Nevertheless, it is a good idea ...


13

Undeleted I would like this question to be undeleted. It was voluntarily removed by the author although a correct answer was given. Given the OP's history on MSE, it seems the user asks questions, gets answers, and then deletes the questions. I do not think this should be permitted, as some user in the future may have the same question as the OP, but a ...


11

Reopened This is on the chopping block again: Is zero a prime number? The question was the subject of this meta discussion: How to prevent the loss of excellent answers to poor questions. which resulted in reopening. (Disclosure, I have a solution on the question. I feel the question and solutions are worth fighting for, in this case.) The reason this ...


10

[UNDELETED] Request for undeletion, or explanation of deletion: https://math.stackexchange.com/a/898051/, a "hint" answer that does substantial work toward solving the differential equation in the question Differential equation $\sin \theta \frac{dr}{d \theta}+r\cos \theta =\tan \theta,0<\theta<\pi/2$. The answer received comments that it should be ...


10

Reclosed Please consider re-closing this question : Is it to the students' advantage to learn the language of infinitesimals? On the one hand, the question is primarily about pedagogy, which would be a better fit for a different SE site. But, more importantly, the question is essentially a request to engage in a discussion about whether there is an "...


10

Reopened, Put on hold, deleted, undeleted, deleted, re-undeleted, re-deleted, undeleted again, deleted again, locked, unlocked and reopened Please consider reopening What digits is the "number" $\infty$ composed of?. This question was closed as "not about mathematics". Obviously, this question is based on some misconceptions of what infinity is, ...


10

That is because it was flagged that the duplicate was inappropriate-- specifically, that the duplicate target was about implicit parenthesis, which was not applicable to your question. I do think this is a good point, so I reopened it. I expect it will be closed again, most likely, but with a more appropriate duplicate target.


10

Reopened, reclosed, reopened again, closed once again, and reopened once again Please consider reopening this Question, which was closed for lack of context. Yet the original opening paragraph gives the following context: I have a young group of kids (30) playing soccer and they need to be put into 6 teams of 5 players for each round of matches. All 6 teams ...


9

[REOPENED] (Also, as pointed out by Asaf in a comment below, this was a duplicate request. My apologies for the inadvertent dupliaction.) The question "If every convergent subsequence converges to a then so does the original sequence" should be reopened (in my opinion). It is a request for clarification/explanation of an argument from a text. It was ...


9

Reopened, Re-closed (by a mod), and Reopened again with context edit reinstated Please consider reopening Any criteria for a category to have all connected limits?. This is a very natural question about whether there is an analogue of certain well-known basic theorems in category theory in a less well-known context. The context in the original question was ...


8

Closed, re-opened Solve for $x^2 + 7x +1 = 3n(x^2 + x +1), n \in \Bbb{Z}$ My this question was put on hold as off-topic because it lacks context. It also gives a link to how I can add context. The link gave the following points Include your work My response - I answered that question which I asked. I got a few hints from the comments which helped me. ...


7

[REOPENED] This question was closed as a duplicate, but the question specifically asks not for a proof (which the OP knows) but, instead, for some intuition behind successful strategies for constructing such proofs - something that is not addressed at all in the proposed duplicate. Probably there is a good chance of further helpful answers appearing if it ...


7

Reopened Request for reopening: What would change in mathematics if we knew $\pi+e$ is rational? It was closed as unclear last March. I edited it to try to make it clear, and there are comments that (to me) show that the question can be answered reasonably. I voted to reopen, then it went through review and left with 3 selecting "leave closed."


7

Reopened I edited the question Variable in upper bound of sum when it had 4 votes to close, and I also posted a rather detailed answer (which the OP accepted). It got "put on hold as unclear what you're asking" even though I think it's now quite clear and on-topic. Can the question be re-opened?


7

Reopened This meta question has been closed as a duplicate: Can we please STOP closing and deleting old posts with answers? However, it is not a duplicate. The older question is about deleting questions with answers, which is a more general question. (Indeed, it starts with the phrase "A few deays ago I posted an answer...") The newer question is about a ...


7

I saw this Meta question of yours, and happen to be the second undelete-voter. Let me explain why I voted to undelete. I did not see any indication that your answer was flawed, and I supposed that you would have stated it somewhere if it was. From what you say here, it seems that my guess is correct. Thus I think it is better to leave your answer undeleted. ...


6

[REOPENED] Becoming Better at Math was closed on the grounds of being primarily opinion-based. It is community wiki with soft-question and advice tags. Though there are many possible answers (hence the CW), I do not find the question to be opinion based, as it is a call for guidance from experienced mathematics students, who in general do not disagree ...


6

Reopened This question was closed as "off topic". It was originally just a statement of a problem, but not the OP has added some more detail and motivation. So I believe that it should be reopened.


6

[REOPENED] Linear Transformation on $\mathbb{R}^6$ was closed for missing context (also by me) because the OP showed no work. This was changed in a comment to my answer. I have copied the relevant comment (of the OP) into the question body to salvage it. Maybe someone TeXifies the image? (Can't be bothered right now)


6

Reopened Request to reopen this question: If the map induces identity on all homotopic groups then it is homotopic to identity It appears that the question was closed because the closers did not read it carefully: At least the first close vote stemmed from the incorrect assumption that the question was about the proof of Whitehead's theorem. Even in its ...


6

I would call the new thread [current] rather than [new version], and identify the old one as [archive 1]. Then people will get used to looking at the "current" thread for new material. The thread names can be amended at each cycle where a new thread needs to open. The suggestion in @quid's comment is a significant improvement: rather than simply numbering ...


6

Reopened The question A Proof of the Fundamental Theorem of Arithmetic was rightfully quickly closed as unclear, but the asker has since edited to clarify what they meant and what specific difficulty they had adapting the standard proofs to get what they want. It seems to me to be a perfectly reasonable question which is mostly clear (though a constraint ...


6

Reopened I would like to see the question "What is $\nabla X$ in Riemannian geometry?" re-opened. (I see from the timeline that the reopen queue has finished. In hindsight, I should have edited the title when I made the reopen vote.) It appears it was marked as a duplicate of Gradient of a vector field?, seemingly because the short version of the question (...


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