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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 from less experienced users, I believe this is an example of a question that was too quickly closed and not given due consideration. I had previously voted to ...

[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 people wanted to delete it 11 months ago.

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 phrasing was not clear. Most of the answers (including the green-ticked one) are indeed "chess answers". However, it is not a question of chess ...

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 to close it not really convincing. It attracted several good answers so far.

Status [UNDELETED] . (Thank you!) I ask that Counting multiples in short intervals be recovered. I will provide an answer that is an enhancement of Lucia's comment as well as motivation for the question. It is part of my exploration of a combinatorial approach in number theory. (GRP20200411)

[UNDELETED] I would like to add as undelete-request On variants of the abc conjecture in terms of Lehmer means that was automatically deleted yesterday. If possible, I think that it is an interesting question about the abc conjecture. Many thanks.