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Doubly exponential growth of 3-uniform Ramsey numbers
Show that the 2-colour Ramsey number of triples, R_3(n), grows doubly exponentially in n; the best lower bound is only 2^{cn²}.
| 1 | { |
| 2 | "domain": "mathematics", |
| 3 | "topics": [ |
| 4 | "combinatorics", |
| 5 | "graph-theory" |
| 6 | ], |
| 7 | "type": "construction", |
| 8 | "also": [ |
| 9 | "proof" |
| 10 | ], |
| 11 | "cover": { |
| 12 | "motif": "graph", |
| 13 | "n": 6 |
| 14 | }, |
| 15 | "source": { |
| 16 | "key": "erdos", |
| 17 | "name": "Erdős Problems", |
| 18 | "url": "https://www.erdosproblems.com/564", |
| 19 | "id": "564", |
| 20 | "curator": "Thomas Bloom", |
| 21 | "poser": "Paul Erdős, András Hajnal and Richard Rado", |
| 22 | "status": "open, $500 prize", |
| 23 | "as_of": "2026-10-20", |
| 24 | "prize": "$500", |
| 25 | "catalog": "0521c19bbd38" |
| 26 | }, |
| 27 | "review": true, |
| 28 | "approval": "first-time" |
| 29 | } |