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`BookProof.ChapterLorentzRealRep.WHalf_invariant_apply` (S : Matrix (Fin 4) (Fin 4) ℤ) (hS : S ∈ Omega) (A : Matrix (Fin 4) (Fin 4) ℝ) (hA : A ∈ WHalf) : castR S * A * castR (cinv · Prove2Me