∀ {G : Type u_1} [inst : AddGroup G] [inst_1 : TopologicalSpace G] {N : Type u_2} [inst_2 : AddGroup N]
  [inst_3 : TopologicalSpace N] {P : Type u_3} [inst_4 : AddGroup P] [inst_5 : TopologicalSpace P]
  (K : OpenAddSubgroup P) (f₂ : N →+ P) (hf₂ : Continuous ⇑f₂) (f₁ : G →+ N) (hf₁ : Continuous ⇑f₁),
  OpenAddSubgroup.comap f₁ hf₁ (OpenAddSubgroup.comap f₂ hf₂ K) = OpenAddSubgroup.comap (f₂.comp f₁) ⋯ K