Formalising Lie algebras
summary
Formalises finite‑dimensional Lie algebra theory in Lean + Mathlib, builds the classical families and the five exceptional algebras by constructing a free non‑unital non‑associative algebra then quotienting by Serre relations, and encodes E8 from an explicit Serre matrix construction. States the classification of semisimple Lie algebras over an algebraically closed field of characteristic zero, adds a reusable algebra hierarchy, and reports roughly 5–10 hours of graduate‑course content already formalised.
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