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Oct 22, 2013 at 12:26 comment added Maxim Gilula Great, thank you for the information.
Oct 22, 2013 at 12:21 vote accept Maxim Gilula
Oct 22, 2013 at 10:14 comment added user9072 To complement @GerryMyerson's remark: if avoiding points is the only motivation you might consider instead to give the answer as an anwser proper and make it Community Wiki. See meta.mathoverflow.net/questions/493/… and the links for issues with questions answered in comments only.
Oct 22, 2013 at 9:27 history edited Kim MorrisonMod CC BY-SA 3.0
improving title
Oct 22, 2013 at 7:05 answer added Todd TrimbleMod timeline score: 15
Oct 22, 2013 at 6:12 comment added Gerry Myerson If, for whatever reason, you do not wish to accrue any points, either for this particular answer or in general, you might post an answer as a comment.
Oct 22, 2013 at 5:29 comment added David Roberts Mod If the answer can fit in a comment, then that's a reasonable indication that it might not be worth adding as a full-blown answer.
Oct 22, 2013 at 3:16 comment added Daniel Moskovich Another case is when you think the question might be a bit trivial, so you give a trivial proof/counterexample in a comment, and either the OP realizes the question needs an edit, or the question is made obsolete.
Oct 22, 2013 at 2:48 comment added JRN Another reason for answering in comments is that official answers bump up the question in the active list, but comments don't. Some people get annoyed if questions are bumped often, and so some choose to answer in comments if they feel that their answers are not too important.
Oct 22, 2013 at 2:46 comment added JRN Note that I just answered your question in a comment. I did this because I felt that my answer did not address your question completely.
Oct 22, 2013 at 2:46 comment added JRN One possibility is that the question has been closed, and so cannot accept any more answers, but can still accept comments.
Oct 22, 2013 at 2:14 history asked Maxim Gilula CC BY-SA 3.0