Timeline for Modular Lambda Function as a Cross ratio
Current License: CC BY-SA 2.5
3 events
| when toggle format | what | by | license | comment | |
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| Dec 16, 2010 at 8:17 | comment | added | kks | In his page math.ucr.edu/home/baez/week229.html John Baez explains the way 4 points occur only once in the double cover of the 2-sphere by a 2-torus, every elliptic curve can be imagined to be. The fact that these 4 points can be chosen along the equator or as vertices touching the sphere of an ideal tetrahedron implies a relationship of the cross-ratio to the hyperbolic space with the sphere as boundary at infinity, something I still find mysterious. | |
| Dec 16, 2010 at 7:59 | vote | accept | kks | ||
| Dec 15, 2010 at 8:25 | history | answered | S. Carnahan♦ | CC BY-SA 2.5 |