Timeline for Volume-preserving projective transformations are isometries
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 21, 2014 at 14:38 | vote | accept | alvarezpaiva | ||
| Mar 21, 2014 at 14:38 | comment | added | alvarezpaiva | @Misha and Benoit: the title was for "connoisseurs", the statement of the result was to make it independent of previous acquaintance with projective geometry. Besides, in the general case I do need $C^1$. | |
| Mar 21, 2014 at 14:34 | comment | added | alvarezpaiva | @BenoîtKloeckner: bien vu! Exactly the sort of elementary argument I was looking for. | |
| Mar 21, 2014 at 12:46 | comment | added | Misha | ... in particular, being a bijection is enough for the map to belong to $PGL(n+1,R)$ (for $n\ge 2$). | |
| Mar 21, 2014 at 12:25 | comment | added | Benoît Kloeckner | Oh, by the way: you do not need as much regularity as you assumed. | |
| Mar 21, 2014 at 12:18 | history | answered | Benoît Kloeckner | CC BY-SA 3.0 |