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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.
Group theory
WithdrawnWithdrawn 6 Aug 2026
SOLVED (approved submission 82ab85ee refutes the published target with a 3-approximate group A = ({-1} × H) ∪ ({+1} × H) ∪ {(0,1)} in Multiplicative ℤ × H, whose only element at coordinate 0 is the identity, so every S ⊆ A with S^8 ⊆ A^4 is a singleton; the formalization is faithful and no defect was found)
Read the recorded decision1 proof submitted, last month
Formal statement
Proof target
import FormalConjectures.GreensOpenProblems.«29»
import TaskSupport
namespace Bounty
theorem target : fcTypeOfName% "Green29.green_29" := by
sorry
end Bounty
Original conjecture (Lean type)
True ↔
∃ C c,
0 < C ∧
0 < c ∧
∀ {G : Type u_1} [inst : Group G] [inst_1 : DecidableEq G] (K : ℝ) (A : Finset G),
1 ≤ K → IsApproximateSubgroup K ↑A → ∃ S ⊆ A, C * K ^ (-c) * ↑A.card ≤ ↑S.card ∧ S ^ 8 ⊆ A ^ 4Original conjecture source: FormalConjectures/GreensOpenProblems/29.lean
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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