Correction: Theorem Formalized 8 Years Ago in Lean

littmath · x · 2026-08-31

Responding to a claim about spending $2,000 to formalize π₃(S²) = Z, a commenter noted that this theorem was already formalized in a Lean2 repository 8 years ago. The current project's difficulty likely lies in setting up Homotopy Type Theory foundations.

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