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Mathlib.Algebra.Lie.Basis.Prod

Products of bases Lie algebras #

Given two finite-dimensional simple Lie algebras, if they admit bases with matching Cartan matrices, they must be isomorphic. This file provides a proof of this as LieAlgebra.Basis.equivOfReindex.

noncomputable def LieAlgebra.Basis.equivOfReindex {ι₁ : Type u_1} {ι₂ : Type u_2} {L₁ : Type u_3} {L₂ : Type u_4} [Finite ι₁] [Finite ι₂] ( : ι₁ ι₂) [LieRing L₁] [LieRing L₂] {K : Type u_5} [Field K] [CharZero K] [LieAlgebra K L₁] [FiniteDimensional K L₁] {H₁ : LieSubalgebra K L₁} (b₁ : Basis ι₁ H₁) [LieAlgebra K L₂] [FiniteDimensional K L₂] {H₂ : LieSubalgebra K L₂} (b₂ : Basis ι₂ H₂) (hA : (Matrix.reindex ) b₁.A = b₂.A) [IsSimple K L₁] [IsSimple K L₂] :
L₁ ≃ₗ⁅K L₂

Simple Lie algebras with equivalent bases are equivalent.

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