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That is, I asked before to check the correctness of my proof of that statement, and the correctness has been confirmed. Could I now flag a question asking for the proof of it as "possible duplicate" of my question?

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  • $\begingroup$ Which question appeared for first, your proof-checking question or the proof-hunting question? $\endgroup$ – Jack D'Aurizio Apr 4 '18 at 5:54
  • $\begingroup$ @JackD'Aurizio: My proof-checking. Maybe I know what you meant, it's about time precedence? But wouldn't it be strange to provide a question as an answer? $\endgroup$ – nCm Apr 4 '18 at 6:25
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    $\begingroup$ Because it would be "This question already has a answer" to "This question already has a ... question". $\endgroup$ – nCm Apr 4 '18 at 6:27
  • $\begingroup$ Some past discussions about this topic: Closing as a duplicate if the post contains OP's own proof/solution (and perhaps some of the questions linked there) and Proof-verification and duplicates. $\endgroup$ – Martin Sleziak Apr 4 '18 at 11:49
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If your proof is the natural and generally accepted way to prove a certain statement, and it's hard to come up with alternative proofs, I'd say that's it's safe to close it as a duplicate.

If this is not the case, e.g. when your questions is asking to verify a proof that there are an infinite number of primes, it's certainly not appropriate to close it as a duplicate.

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