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Nov 8, 2012 at 15:04 vote accept IMeasy
Oct 14, 2012 at 18:28 comment added IMeasy @Dan: thank you for answering, I have checked the paper and in fact it does seem that you are right. So probably he works over $\mathbb{C}$ just for sake of simplicity?
Oct 12, 2012 at 19:56 history answered Dan Petersen CC BY-SA 3.0