Timeline for Elliptic Curves isogenous only over an extension?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 15, 2013 at 21:25 | vote | accept | Barinder Banwait | ||
| Jul 10, 2013 at 3:48 | comment | added | Álvaro Lozano-Robledo | If you are looking for a concrete non-CM example, take $l=11$, take $E$ to be "121a1", and $E'$ to be "3025c2". Then $E$ and $E'$ are not $11$-isogenous, but they become isogenous over $\mathbb{Q}(\sqrt{5})$. If you want a CM example, take $l=11$, $E=$"121b1", and $E'=$"3025a2". | |
| Jul 9, 2013 at 15:54 | answer | added | Felipe Voloch | timeline score: 5 | |
| Jul 9, 2013 at 15:07 | history | asked | Barinder Banwait | CC BY-SA 3.0 |