∀ (𝕜 : Type u_4) [inst : NontriviallyNormedField 𝕜] (M₁ : Type u_3) (M₂ : Type u_2) (M₄ : Type u_1)
  [inst_1 : SeminormedAddCommGroup M₁] [inst_2 : NormedSpace 𝕜 M₁] [inst_3 : SeminormedAddCommGroup M₂]
  [inst_4 : NormedSpace 𝕜 M₂] [inst_5 : SeminormedAddCommGroup M₄] [inst_6 : NormedSpace 𝕜 M₄],
  IsTopologicalAddGroup (M₁ →L[𝕜] M₂ × M₄)