My answer to this question has been deleted by a moderator, apparently, and made into a comment. I would like to know why, as I cannot see a good reason for it.

The OP asked for a hint, and that's exactly what I gave. In what sense is that a comment and not an answer?

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    $\begingroup$ Nine downvotes and still no one explains to me why it was a comment and not an answer. $\endgroup$ – Martin Argerami Oct 19 '13 at 15:43

Originally your answer read (and what I converted into a comment was)

As you said yourself, the set you are looking for has empty interior.

which in my opinion was neither an answer or a hint, but simply a restatement of something the OP mentioned in the question. But, fine, I'll undelete it and let the community handle it.

  • $\begingroup$ Fine, from now on I'll write "hint:" whenever I give a hint. $\endgroup$ – Martin Argerami Oct 19 '13 at 4:44
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    $\begingroup$ Hint: be extra polite to the moderators! $\endgroup$ – The Chaz 2.0 Oct 19 '13 at 6:05
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    $\begingroup$ Sometimes the conversion of an answer to a comment can be beneficial. For example, when the answer gets a large number of downvotes. $\endgroup$ – robjohn Oct 19 '13 at 8:30

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