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Jan 13, 2013 at 8:38 comment added David Bryant Thanks heaps! My topology is a bit weak so I don't fully follow the proof of surjectivity, but I'll work at it and try to use it as the basis of a constructive proof. Thanks again. -David.
Jan 13, 2013 at 8:36 vote accept David Bryant
Jan 13, 2013 at 6:13 history answered Will Sawin CC BY-SA 3.0