Poincaré conjecture fully formalized in Lean after two-week sprint
burny_tech · x · 2026-09-28
Mathematician jdlichtman announced that the Poincaré conjecture has been fully formalized in Lean, completed by Ben Chow's team in a two-week sprint.
- A year ago, Chow worried the formalization project wouldn't be finished in his lifetime; jdlichtman told him it would be in range within a year — Chow didn't believe it.
- The team has now wrapped the entire formalization at a dramatically faster pace.
- The milestone underscores how interactive theorem proving (and AI-assisted formalization workflows) is accelerating the verification of major mathematical results.
Related event: Poincaré Conjecture Fully Formalized in 4.7M Lines of Lean(3 posts)→
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