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Aug 1, 2012 at 14:05 comment added Joe Silverman A better analogue of the degree 2 map $E\to\mathbb{P}^1$ for an elliptic curve is the degree 2 map $A\to A/\pm1$ from $A$ to the associated Kummer variety. (Of course, you need to blow up some points if you want a smooth quotient, and then then map is only rational, it's not a morphism.)
Aug 1, 2012 at 13:22 vote accept Harry
Aug 1, 2012 at 13:04 answer added Jason Starr timeline score: 11
Aug 1, 2012 at 12:48 history asked Harry CC BY-SA 3.0