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No three in line: more than 1.5n points in the n × n grid
Construct, for arbitrarily large n, more than 1.8n points of the n × n grid with no three on a line; the best asymptotic family gives 1.5n.
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| 1 | +{ | |
| 2 | + "domain": "mathematics", | |
| 3 | + "topics": [ | |
| 4 | + "discrete-geometry", | |
| 5 | + "combinatorics" | |
| 6 | + ], | |
| 7 | + "type": "construction", | |
| 8 | + "cover": { | |
| 9 | + "motif": "points", | |
| 10 | + "n": 10 | |
| 11 | + }, | |
| 12 | + "source": { | |
| 13 | + "key": "frontiermath-open", | |
| 14 | + "name": "FrontierMath: Open Problems", | |
| 15 | + "url": "https://epoch.ai/frontiermath/open-problems/no-three-in-line", | |
| 16 | + "id": "no-three-in-line", | |
| 17 | + "curator": "Epoch AI", | |
| 18 | + "status": "unsolved", | |
| 19 | + "as_of": "2026-10-20", | |
| 20 | + "catalog": "0521c19bbd38" | |
| 21 | + } | |
| 22 | +} | |