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17 votes
Accepted

Why was my question deleted?

Cross-posting is generally frowned upon, the post was flagged as a cross-post, and with no answer it is my general approach to simply delete the cross-post. However, in this case the post had gone ...
Asaf Karagila's user avatar
  • 38.1k
9 votes

Reviving questions from the PROMYS application?

This is a genuinely tricky question. I incline toward agreeing with the policy that while we can try to keep problems off the site while applications are open, we can't be expected to play whack-a-...
Ben Webster's user avatar
  • 44.2k
6 votes
Accepted

Interesting question deleted by author — how to reach out to author to ask to undelete?

Thanks to @Emil Jeřábek for finding the author of the question, whom I have now e-mailed. (ETA: it's back now!) Thanks also to @Martin Sleziak for his answer in comments to the meta-question of "...
6 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] The question Center of a monoid ring asks two questions, one of which can be found in standard texts and the other which is essentially an open question but which appears to be a harmless ...
6 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] The question Has Perelman's proof been accepted or are there still unresolved issues? has been closed as of this writing. At first glance, this question seems to be of the genre, "Is ...
6 votes

Requests for reopen and undelete votes for closed and deleted questions

[UNDELETED] This is an undelete request for an answer on meta: namely, quid's answer to my question Some proposals for modifications of the process of closing/reopening questions . The answer was ...
5 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] The OP of this question Connected sum is well-defined for surfaces, proof? requests reconsideration to reopen. It was closed as a duplicate, but OP says that what is asked for was not ...
5 votes
Accepted

Undelete a post

While we can easily undelete the question, actually migrating it would be impossible. We can only migrate questions which are younger than 60 days. Given that the post had been automatically deleted ...
Asaf Karagila's user avatar
  • 38.1k
4 votes

Requests for reopen and undelete votes for closed and deleted questions

[Undeleted; Reopened] If normal with respect to prime base then normal for all bases was closed as not being research math. I nominated it for reopening, after leaving a comment establishing its ...
4 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] I'd like to suggest reopening Covering systems. As I wrote in a comment, Why is this closed? Covering systems are a recognized area of research in Number Theory. It's known that in an ...
4 votes

Undelete request, Question 290941

The question has now been undeleted (revisions/timeline).
3 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] The question Identify one group of linear transformations was closed as "unclear what you're asking". Afterwards it has been edited and clarified. I don't see what is still "unclear" in ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

https://mathoverflow.net/questions/379145/geometric-combinatorial-problem-in-the-euclidean-space This question was deleted by nobody less than @ToddTrimble just 10 days ago after having 9 upvotes and ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

A chess question of W.T. Tutte has been closed for at least 5 years. The only argument given for its closure at the time was that a moderator saw it as a question of chess strategy. I think the first ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

Status: [REOPENED] Thank you! Request to reopen How to obtain the rational solution of a linear system efficiently?. In light of recent discussions about being more welcoming to good faith questions ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

[UNDELETED] I propose to undelete my question: Something like mathoverflow in other sciences It was asked in the early days of MO and has some useful links and information. I Have no idea why some ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] Why did Bourbaki ignore the theory of categories? only survived 25 hours in 2013, collecting 5 answers; it has been closed ever since. The reason given (“not constructive”, “will likely ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] This cw question (on the spelling of Chebyshev and Cholesky) has good answers and I think it deserves to be reopened. (The sole Chebyshev case was worth a specific discussion, and for this ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

[UNDELETED] [REOPENED] [CLOSED] I would suggest to undelete/reopen https://mathoverflow.net/q/328312, as a courtesy and sign of respect, and then hopefully one of our experts can answer it. I know, ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

[UNDELETED] I propose that this question should be undeleted: Reduced ring with all non-prime ideals finitely generated It was deleted by the OP despite having a substantial answer by Keith Kearnes. ...
3 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] Boundary conditions for Klein-Gordon equation The author has responded to comments and edited the question into a form that is much clearer, and in fact bringing it into the realm of ...
2 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] Basic Definition and Notations in RWRE is exactly what it says: a question about definitions and notation used in the study of random walk in random environment (RWRE) within probability ...
2 votes

Requests for reopen and undelete votes for closed and deleted questions

[UNDELETED] The question On isolated points of the approximate point spectrum of a bounded operator looks reasonable and did not attract any negative comments or downvotes. I propose that it should ...
2 votes

Requests for reopen and undelete votes for closed and deleted questions

[UNDELETED] The question Generalized arithmetic progressions contained in Bohr sets looks reasonable and did not attract any negative comments or downvotes. I propose that it should be undeleted
2 votes

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] I would like to request to reopen Relation between the Hochschild cohomology of group algebras and groupoids. The original question was very vague, but it has since been edited and is now, ...
1 vote

Requests for reopen and undelete votes for closed and deleted questions

Status: [REOPENED] Request to reopen What is the endgoal of formalising mathematics? I think it's a good question about an important contemporary evolution of mathematics and found the few arguments ...
1 vote

Requests for reopen and undelete votes for closed and deleted questions

[REOPENED] How slowly can it takes for the Fibonacci terms in a partially permutative self-distributive algebra to stabilize? How slowly can it takes for the Fibonacci terms in a partially ...
1 vote

Requests for reopen and undelete votes for closed and deleted questions

The question Why do some mathematicians believe that the notation $(x_n)_{n\in \omega}$ is better than $(x_n)_{n=0}^\infty$ or $(x_n)_{n\in \mathbb N}$ seems to be asked in good faith, even if the ...
1 vote

Requests for reopen and undelete votes for closed and deleted questions

Re-opened and then re-closed I don't think it is obvious how to find the shortest chord that bisects the area of a convex polygon. That is the question posed in this now closed post: Shortest ...
1 vote

Requests for reopen and undelete votes for closed and deleted questions

[Deleted] I believe that https://mathoverflow.net/questions/279453/ deserves re-opening, so that the OP can clarify or engage. It might be that the notion of magnitude for metric spaces, for instance, ...

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