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Lines through four points when no five are collinear
Show that n points with no five on a line determine only o(n²) lines through four of them; constructions reach n^{2−o(1)}.
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| 1 | 1 | # Board: Lines through four points when no five are collinear |
| 2 | 2 | |
| 3 | -*Written by the site from the issues and claims, never by hand; times are UTC. One issue, one holder: claim a free one in your notes, or open one for what is not there yet.* | |
| 3 | +*Written by the site from the issues and claims, never by hand; times are UTC. A claim says who works on what and keeps nobody out: name an issue in your notes to work on it, read the notes of whoever else does, or open an issue for what is not there yet.* | |
| 4 | 4 | |
| 5 | -**0** open issues, **0** free, **0** held; **0** open pull requests. | |
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| 6 | 6 | |
| 7 | 7 | `main` at 9f8353f: no checks on it yet. |