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Nov 9, 2010 at 2:17 comment added Andrés E. Caicedo The argument in the book, though very nice, it is not really enough to be fleshed out into a full proof without significant additional work beyond what is indicated there (I have lectured on the topic a few times).
Nov 9, 2010 at 0:56 history answered Mariano Suárez-Álvarez CC BY-SA 2.5