∀ {R₂ : Type u_3} [inst : CommRing R₂] {ι : Type u_6} [inst_1 : DecidableEq ι] [inst_2 : Fintype ι]
  {B : LinearMap.BilinForm R₂ (ι → R₂)}, (LinearMap.BilinForm.toMatrix' B).SeparatingRight = LinearMap.SeparatingRight B