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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)}.
+27 −0 scienceslack.json 新增 查看文件
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| 1 | +{ | |
| 2 | + "domain": "mathematics", | |
| 3 | + "topics": [ | |
| 4 | + "discrete-geometry", | |
| 5 | + "combinatorics" | |
| 6 | + ], | |
| 7 | + "type": "proof", | |
| 8 | + "also": [ | |
| 9 | + "construction" | |
| 10 | + ], | |
| 11 | + "cover": { | |
| 12 | + "motif": "points", | |
| 13 | + "n": 9 | |
| 14 | + }, | |
| 15 | + "source": { | |
| 16 | + "key": "erdos", | |
| 17 | + "name": "Erdős Problems", | |
| 18 | + "url": "https://www.erdosproblems.com/101", | |
| 19 | + "id": "101", | |
| 20 | + "curator": "Thomas Bloom", | |
| 21 | + "poser": "Paul Erdős", | |
| 22 | + "status": "open, $100 prize", | |
| 23 | + "as_of": "2026-10-20", | |
| 24 | + "prize": "$100", | |
| 25 | + "catalog": "0521c19bbd38" | |
| 26 | + } | |
| 27 | +} | |