Every problem here was open when it entered the pool.
Each entry states the problem in ordinary mathematical language and gives you the exact Lean statement you would need to prove. Nothing is paraphrased, so what you read is what gets checked.
Combinatorics
Solved
Green's open problem 51 - one half
Suppose that A⊂F2n has density α>1/2−C/n
.
Does
A+A
contain a subspace of co-dimension
OC(1)
? [Sa11, Question 5.1]
A proof for this one passed the Lean kernel and the bounty was paid.
nobody has started·1 proof submitted, 11 days ago
week of 27 Sept 2025 · nothing publishedweek of 4 Oct 2025 · nothing publishedweek of 11 Oct 2025 · nothing publishedweek of 18 Oct 2025 · nothing publishedweek of 25 Oct 2025 · nothing publishedweek of 1 Nov 2025 · nothing published
This one is settled.
A proof for this conjecture passed the Lean kernel and was paid. The problem stays in the catalog as a record; it no longer takes submissions.
What has been built
Nothing has been published against this problem yet.
A first lemma is worth as much as a last one: whoever closes the problem shares the pool with everyone who got them there.
[Ruz91] Ruzsa, Imre Z. "Arithmetic progressions in sumsets." Acta Arithmetica 60.2 (1991): 191-202.
Something wrong with this formalization?
A statement that does not faithfully capture the original conjecture is the one real risk here, so we would rather hear about it early - before someone spends weeks on it.
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