`BookProof.ChapterA3m.swap12_kronecker` (A B C : Matrix (Fin 4) (Fin 4) ℂ) : swap12 * ((A ⊗ₖ B) ⊗ₖ C) = ((B ⊗ₖ A) ⊗ₖ C) * swap12

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`BookProof.ChapterA3m.swap12_kronecker` (A B C : Matrix (Fin 4) (Fin 4) ℂ) : swap12 * ((A ⊗ₖ B) ⊗ₖ C) = ((B ⊗ₖ A) ⊗ₖ C) * swap12 · Prove2Me