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Jul 19, 2012 at 5:46 history edited Kevin CC BY-SA 3.0
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Jul 19, 2012 at 5:38 history edited Kevin CC BY-SA 3.0
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Jul 19, 2012 at 5:38 comment added Kevin Good point. I'll tone down the wording a bit.
Jul 19, 2012 at 4:46 comment added Gunnar Þór Magnússon This is only a slight nitpick: "... and the smooth curve $E$ of genus 1 includes canonically into $X$". In fact $X$ is the total space of a family of elliptic curves $E$ (all isomorphic between them) over the projective line, so the inclusion of $E$ into $X$ is not very canonical (unless we can agree on one point of $\mathbb P^1$---a homogeneous manifold---being more canonical than all the others!).
Jul 19, 2012 at 3:49 history edited Kevin CC BY-SA 3.0
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Jul 18, 2012 at 20:17 history answered Kevin CC BY-SA 3.0