3D Kakeya conjecture fully formalized in Lean 4 with no sorry, aided by ByteDance Seed AI4Math

AlexKontorovich · x · 2026-09-09

The proof of the 3D Kakeya conjecture (Guth–Wang–Zahl) has been fully formalized in Lean 4, open-sourced as project-numina/kakeya-3d. Combined with the unconditional Sticky Kakeya formalization by Nankai University × ByteDance Seed AI4Math, the proof carries no sorry and no project-specific axioms — completely machine-verified. The formalization is layered: KakeyaDimensionThree derives the conjecture from one explicit input (GWZ Theorem 7.3(A)), which KakeyaDimensionThreeofpureWZ2 discharges. Hailed as a showcase of AI helping turn frontier mathematics into machine-checked proofs.

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