`BookProof.LorentzOrthochronous.isPO_mul` {a b : Matrix (Fin 4) (Fin 4) ℝ} (ha : IsProperOrthochronous a) (hb : IsProperOrthochronous b) : IsProperOrthochronous (a * b)

Initializing...

`BookProof.LorentzOrthochronous.isPO_mul` {a b : Matrix (Fin 4) (Fin 4) ℝ} (ha : IsProperOrthochronous a) (hb : IsProperOrthochronous b) : IsProperOrthochronous (a * b) · Prove2Me