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Suppose I have seen an answer to a question by a user X.

Suppose another user Y leave a comment under X's answer. This comment received good number of up votes (6 as of now). This comment is not explicitly mentioned in any other answers

Is it OK if I can make this comment as a CW answer giving appropriate credit for the user Y?

That question already has many answers, along with an accepted answer.

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    $\begingroup$ A related older post: Questions answered in a comment. $\endgroup$ – Martin Sleziak Jun 1 at 7:41
  • $\begingroup$ @MartinSleziak but that question already have many answers, along with an accepted answer... $\endgroup$ – Praphulla Koushik Jun 1 at 7:44
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    $\begingroup$ Yes, it's encouraged. Usually I do so after suggesting to the commenter to write an answer and waiting for a few days. Conversely it occurred to me to write an answer after being encouraged to do so after a comment (preferably cw if it's just a reference). $\endgroup$ – YCor Jun 2 at 14:15
  • $\begingroup$ @YCor "and waiting for a few days." +1 Ok.. $\endgroup$ – Praphulla Koushik Jun 2 at 14:25
  • $\begingroup$ PS I was mainly addressing the case of a question answered in comments. You should do this only if there is good reason to promote the question to an answer. For instance, if it's a good alternative answer. Maybe also if it fixes or improves the existing answer, in case the answerer doesn't want to modify the answer. Or possibly for some other reason (would you point to the post(s) you have in mind?) $\endgroup$ – YCor Jun 2 at 14:33
  • $\begingroup$ @YCor I am referring to comment mathoverflow.net/questions/119699/… $\endgroup$ – Praphulla Koushik Jun 2 at 15:08
  • $\begingroup$ Isn't it fine as a comment? $\endgroup$ – YCor Jun 2 at 15:32
  • $\begingroup$ @YCor The point that sheafification functor may not exists for a large category seems (to me) to be an important thing and that is what Urs said in his comment.. It has not mentioned in any of the answer, not even in Urs's answer.. So, I thought of making a CW answer.. Is that fine or should I leave it as it is? $\endgroup$ – Praphulla Koushik Jun 2 at 15:48
  • $\begingroup$ Sure, this seems to be a good complementary answer then. $\endgroup$ – YCor Jun 2 at 17:20
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It's perfectly okay to do this, Praphulla. Usually that would be seen as a service to the community.

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