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Apr 25, 2012 at 14:10 comment added Daniele We must take seriously that $e^i=1$ was written on a wall of Princeton University math department! Of course, I'm enjoying of the friendly tone of your question (the tag is "recreational").
Apr 25, 2012 at 11:10 comment added joro It can be used in the Millenium Prize Problems too ;-)
Apr 25, 2012 at 10:32 history answered Daniele CC BY-SA 3.0