Timeline for Does a certain points and lines configuration exist?
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| Jul 21, 2017 at 11:25 | vote | accept | Fedor Petrov | ||
| Jul 21, 2017 at 5:55 | history | edited | Fedor Petrov | CC BY-SA 3.0 |
added 174 characters in body
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| Jul 21, 2017 at 0:11 | answer | added | William Ballinger | timeline score: 12 | |
| Jul 20, 2017 at 20:48 | answer | added | Gerhard Paseman | timeline score: 4 | |
| Jul 20, 2017 at 13:49 | comment | added | Gerhard Paseman | I have an example for n=4, but I do not see how to add to it. Gerhard "Maybe There Is No More?" Paseman, 2017.07.20. | |
| Jul 20, 2017 at 13:23 | comment | added | Dominic van der Zypen | Lovely question! | |
| Jul 20, 2017 at 12:21 | comment | added | Fedor Petrov | @AlexeyUstinov if any line between two points of the same colour contains a point of different colour, this is impossible (unless all points are collinear). This is a known theorem. If you omit the condition "of the same colour", there are some examples like "all but 1 red points lie on a horizontal line in equal distances, the $n-1$ blue points are obtained from them by a vertical shift; the $n$-th blue point is vertical infinity, the $n$-th red point is a center of symmetry of mentioned $2n-2$ points". | |
| Jul 20, 2017 at 12:16 | comment | added | Fedor Petrov | @BenoîtKloeckner of course, fixed | |
| Jul 20, 2017 at 12:16 | history | edited | Fedor Petrov | CC BY-SA 3.0 |
added 20 characters in body
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| Jul 20, 2017 at 11:56 | comment | added | Alexey Ustinov | Does it make sense to ask the opposite: ... any line which passes through two points of the SAME colour... | |
| Jul 20, 2017 at 11:34 | comment | added | Benoît Kloeckner | I guess you want to forbid the $2n$ points to be aligned. | |
| Jul 20, 2017 at 11:29 | history | asked | Fedor Petrov | CC BY-SA 3.0 |