Development

Mathematicians reportedly formalize the Poincaré proof in Lean

development2026-09-29science

Claim

The issue reports a Lean formalization of the Poincaré proof comprising 4.7 million lines produced over two weeks.

Reported metric: 4.7 million lines; two weeks

Reporting date: 2026-09-29 (not necessarily the event date)

Sources

Attribution and reporting linked by this record; links do not imply independent verification.

Welcome to September 29, 2026 (theinnermostloop.substack.com)
Source linked by the September 29 issue (x.com)

Indexed from the September 29 newsletter. Linked-source claims have not been independently verified.

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Welcome to September 29, 2026

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Welcome to September 29, 2026

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Mathematicians reportedly formalize the Poincaré proof in Lean
Innermost Loop KB — secondary record
Reporting date: 2026-09-29
KB permalink: https://nicholsn.github.io/innermost-loop-kb/developments/2026-09-29-poincare-lean
Claim: The issue reports a Lean formalization of the Poincaré proof comprising 4.7 million lines produced over two weeks.
Attributed sources:
- Welcome to September 29, 2026 — https://theinnermostloop.substack.com/p/welcome-to-september-29-2026
- Source linked by the September 29 issue — https://x.com/ayushkhaitan343/status/2104289939840176167
This citation does not imply independent verification of linked-source claims.

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