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 40 - f two eq one
It is not known whether f(2) = 1 [Gr24]
A proof for this one passed the Lean kernel and the bounty was paid.
1 piece from 1 person·last one 19 days ago·1 proof submitted, 4 days ago
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27 Sept 2025a year of work on this problem19 Sept 2026
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.
[Da90] Davydov, Alexander Abramovich. "Construction of linear covering codes." Problemy Peredachi Informatsii 26.4 (1990): 38-55.
[CHL97] Cohen, G., Honkala, I., Litsyn, S., & Lobstein, A. (1997). Covering codes (Vol. 54). Elsevier.
[St94] R. Struik, Covering codes, PhD Thesis, Eindhoven University of Technology, the Netherlands, 106 pp, 1994.
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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