Timeline for Projective invariants of the plane and cross ratio
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 5, 2021 at 16:40 | comment | added | coudy | I struggled a bit to find a geometric interpretation of the quantities $\langle \{2\} \mid 1,3,5,4 \rangle$ considered in the reference. Now I understand that this is the cross-ratio of the four lines from $M_1$ to the other points $M_2$, $M_3$, $M_4$ and $M_5$. Fine! | |
| May 5, 2021 at 14:01 | vote | accept | coudy | ||
| May 4, 2021 at 14:09 | history | answered | Gro-Tsen | CC BY-SA 4.0 |