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Jul 19, 2011 at 16:26 comment added Georges Elencwajg Very nice, Torsten: this explains a lot!
Jul 19, 2011 at 15:40 comment added Martin Brandenburg Great! This equals Nick's proof (generalized to arbitrary $n$ as I've done in the comments there).
Jul 19, 2011 at 15:23 history edited Torsten Ekedahl CC BY-SA 3.0
added 65 characters in body
Jul 19, 2011 at 12:36 history answered Torsten Ekedahl CC BY-SA 3.0