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Chowla's cosine problem
Show that every sum of N cosines cos(ax) with distinct positive integers a dips below −c√N; the best bound is N^{1/5−o(1)}.
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| 1 | +{ | |
| 2 | + "domain": "mathematics", | |
| 3 | + "topics": [ | |
| 4 | + "analysis", | |
| 5 | + "number-theory" | |
| 6 | + ], | |
| 7 | + "type": "proof", | |
| 8 | + "source": { | |
| 9 | + "key": "erdos", | |
| 10 | + "name": "Erdős Problems", | |
| 11 | + "url": "https://www.erdosproblems.com/510", | |
| 12 | + "id": "510", | |
| 13 | + "curator": "Thomas Bloom", | |
| 14 | + "poser": "Sarvadaman Chowla", | |
| 15 | + "status": "open", | |
| 16 | + "as_of": "2026-10-20", | |
| 17 | + "catalog": "0521c19bbd38" | |
| 18 | + } | |
| 19 | +} | |