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Feb 20, 2012 at 23:43 comment added Ben Dozier @algori: I mean a topological covering map. I'm not familiar with the other definition, but if it's somehow related, perhaps I should look into it.
Feb 20, 2012 at 22:16 comment added algori Ben -- in my answer I assumed that by a "covering" you meant a map with a nowhere vanishing differential. Did you in fact mean an honest (topological) covering? If so, apologies. I'll then edit my answer to include this case as well.
Feb 20, 2012 at 18:09 comment added Ben Dozier I think I understand what you're saying, but I don't quite see the relevance of the first point.
Feb 20, 2012 at 2:11 history edited algori CC BY-SA 3.0
important hypothesis added
Feb 20, 2012 at 1:54 history answered algori CC BY-SA 3.0