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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Mar 8, 2012 at 14:02 comment added berl13 I have seen this discussion. But I am not so much interested in the smooth structure. So my question is purely topological.
Mar 8, 2012 at 12:47 history answered Ulrich Pennig CC BY-SA 3.0