Timeline for Modular Lambda Function as a Cross ratio
Current License: CC BY-SA 2.5
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 16, 2010 at 7:59 | vote | accept | kks | ||
| Dec 15, 2010 at 10:37 | comment | added | Wadim Zudilin | There is an excellent answer to you question in Yoshida's book "Hypergeometric Function, My Love". | |
| Dec 15, 2010 at 8:25 | answer | added | S. Carnahan♦ | timeline score: 2 | |
| Dec 15, 2010 at 8:07 | comment | added | Robin Chapman | An elliptic curve has (affine) equation $y^2=f(x)$ where $f$ is a cubic or a quartic. In either cases there is a map from $E$ to $P^1$ given by $(x,y)\mapsto x$. This is a double cover, ramified at the zeros of $f$, and also at $\infty$ when $f$ is cubic. | |
| Dec 15, 2010 at 6:50 | comment | added | kks | I have read this in: en.wikipedia.org/wiki/Modular_lambda_function I can see it as cross ratio from the Legendre form of elliptic curve, but I do not see how it is that of the branch points of a ramified double cover of the projective line. | |
| Dec 15, 2010 at 5:20 | comment | added | Yemon Choi | See also mathoverflow.net/howtoask | |
| Dec 15, 2010 at 5:13 | comment | added | Yemon Choi | Which parts don't you understand? where have you read this? Have you read mathoverflow.net/faq? | |
| Dec 15, 2010 at 4:54 | history | asked | kks | CC BY-SA 2.5 |