Timeline for CM of elliptic curves
Current License: CC BY-SA 2.5
3 events
| when toggle format | what | by | license | comment | |
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| Feb 5, 2010 at 3:53 | comment | added | Emerton | The extra endomorphisms of $E$ over $\mathbb C$ are generated by $(x,y)\mapsto (-x,iy).$ This is evidently not defined over ${\mathbb Q}$. To cement the matter, note that it acts on the differential $dx/y$ as multiplication by $i$, which is not in ${\mathbb Q}$. | |
| Feb 4, 2010 at 20:44 | comment | added | natura | Thank you Ben! Can you tell me how to verify that End_Q(E)=Z? | |
| Feb 4, 2010 at 18:36 | history | answered | user1073 | CC BY-SA 2.5 |