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Jun 22, 2022 at 8:13 history edited CommunityBot
replaced http://math.uga.edu/~pete with http://alpha.math.uga.edu/~pete
Jan 10, 2010 at 12:28 vote accept Chandan Singh Dalawat
Nov 27, 2011 at 8:42
Jan 8, 2010 at 10:42 comment added Chandan Singh Dalawat That's very nice, Pete; the question seems to have been tailor-made for you! I'm tempted to "accept" your answer, but perhaps we should wait for someone to write down an explicit equation of a genus-$1$ curve $C$ over a quadratic field $K$ whose jacobian $J$ has good reduction everywhere and such that $[C]$ is an order-$2$ element of $\operatorname{Sha}(J,K)$. It would have the same appeal as Selmer's example ($3x^3+4y^3+5z^3=0$) or Tate's example ($y^2+xy+\varepsilon^2y=x^3$).
Jan 8, 2010 at 9:03 history edited Pete L. Clark CC BY-SA 2.5
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Jan 8, 2010 at 9:03 comment added Pete L. Clark My choice of Tate's example was made independently of Chandan's comment above: it's just a coincidence. Anyway, there are plenty of other examples, probably including some which have nontrivial Sha over the ground field.
Jan 8, 2010 at 8:54 history answered Pete L. Clark CC BY-SA 2.5