Timeline for Who first used the cross-ratio to describe shapes in hyperbolic geometry?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 10 at 21:10 | answer | added | Sam Nead | timeline score: 2 | |
| Jan 15, 2014 at 6:41 | answer | added | John Stillwell | timeline score: 7 | |
| Dec 16, 2013 at 5:02 | answer | added | user44247 | timeline score: 0 | |
| Dec 16, 2013 at 4:01 | comment | added | Will Jagy | I think its use in projective geometry predates the conformal models for hyperbolic geometry, meaning that its origin lies elsewhere, and somebody worked it into the Poincare disc and upper half plane along the way. So Beltrami or Poincare, maybe even Weierstrass. There is a book on sources in hyperbolic geometry, one of the authors visits MO sometimes. | |
| Dec 16, 2013 at 3:32 | history | asked | Brian Rushton | CC BY-SA 3.0 |