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Sep 11, 2012 at 21:17 comment added Benoît Kloeckner I would not say that $n=2$ is trivial, even if it is not difficult. It can be proved in several ways, but the first proof by Weil in 1926 can be considered to have launched the subject, except that many people seem to have forgotten this work.
Aug 31, 2012 at 12:29 history answered Anton Petrunin CC BY-SA 3.0