Timeline for Numbers of intersection points and lines
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 20, 2017 at 9:46 | history | edited | Joseph O'Rourke | CC BY-SA 3.0 |
Image links broken; now fixed.
|
| Dec 11, 2011 at 13:21 | comment | added | Nekochan | That's very nice, thanks a lot for this reference! | |
| Dec 11, 2011 at 13:19 | vote | accept | Nekochan | ||
| Dec 9, 2011 at 0:29 | comment | added | Joseph O'Rourke | @Barry: I think the distinction only occurs in the Euclidean plane, but in the projective plane, $n$ "parallel" lines meet at one point at infinity, and $n$ collinear points determine just one line. | |
| Dec 8, 2011 at 19:25 | comment | added | Barry Cipra | Joseph, can you elaborate on the nature of the duality here? It seems to me there might be something at stake in the difference. In particular, it's easy to get $n$ lines to have zero points of intersection, but a lot harder to get $n$ points to determine less than one line. | |
| Dec 8, 2011 at 13:46 | history | edited | Joseph O'Rourke | CC BY-SA 3.0 |
added 5 characters in body
|
| Dec 8, 2011 at 13:32 | history | edited | Joseph O'Rourke | CC BY-SA 3.0 |
Typo.
|
| Dec 8, 2011 at 13:18 | history | edited | Joseph O'Rourke | CC BY-SA 3.0 |
Punctuation.
|
| Dec 8, 2011 at 12:57 | history | answered | Joseph O'Rourke | CC BY-SA 3.0 |