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Feb 5, 2010 at 1:27 comment added Ryan Budney Ah, okay. For an irregular covering that'll take some more thought.
Feb 5, 2010 at 1:04 comment added algori Ryan -- the coverings are not assumed to be regular i.e. there may be no $G$. (Which is why I don't see how to adapt the techniques mentioned in your and JSE's answers.)
Feb 5, 2010 at 0:39 history edited Ryan Budney CC BY-SA 2.5
added 12 characters in body
Feb 5, 2010 at 0:33 history answered Ryan Budney CC BY-SA 2.5