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From Poincaré to Geometrization: The Lean Formalization Push
A team led by Ben Chow formalized the proof of the Poincaré conjecture in 4.7 million lines of Lean, then extended the effort to a complete formalization of Thurston's geometrization conjecture with help from NVIDIA.
2026-09-28 ~ 2026-10-11 · 2 episodes · 6 posts
Episode 1 · Poincaré Conjecture Fully Formalized in 4.7M Lines of Lean (2026-09-28, 3 posts)
A four-person team led by UCSD professor Ben Chow completed the full Lean formalization of the Hamilton–Perelman proof of the Poincaré conjecture, totaling 4.7 million lines of code, with AI producing 2.7 million lines in a two-week sprint.
- Team completes Lean formalization of Poincaré conjecture proof in 4.7M lines — latticecut · 2026-09-28
- Poincaré conjecture fully formalized in Lean: 4.7M lines, AI wrote 2.7M in two weeks — 新智元 · 2026-09-28
- Poincaré conjecture fully formalized in Lean after two-week sprint — burny_tech · 2026-09-28
Episode 2 · Thurston Geometrization Conjecture Fully Formalized in Lean (2026-10-10, 3 posts)
A team led by Ayush Khaitan, working with NVIDIA's Humanfia project, has fully formalized the Hamilton–Perelman proof of Thurston's Geometrization Conjecture in Lean. The roughly 4.7-million-line effort reportedly took two weeks.
- Poincaré conjecture proof fully formalized in Lean: 4.7M lines in two weeks with NVIDIA — thesaraharminta · 2026-10-10
- Full Lean Formalization of the Geometrization Conjecture Proof Completed — soumitrashukla9 · 2026-10-10
- Thurston Geometrization proof fully formalized in Lean with NVIDIA collaboration — burny_tech · 2026-10-11