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Jan 16, 2016 at 21:39 vote accept user85355
Jan 16, 2016 at 14:02 vote accept user85355
Jan 16, 2016 at 21:39
Jan 16, 2016 at 13:55 comment added Serguei Popov Yes, that's correct.
Jan 16, 2016 at 13:34 comment added user85355 Thanks for your answer. So, for example, if $X$ is an open subset of $S^{n - 1}$, it is non-polar, correct?
Jan 16, 2016 at 13:03 history edited Serguei Popov CC BY-SA 3.0
added 162 characters in body
Jan 16, 2016 at 12:48 history answered Serguei Popov CC BY-SA 3.0