∀ {𝕜 : Type u_1} [inst : NontriviallyNormedField 𝕜] {n : WithTop ℕ∞} {H : Type u_2} [inst_1 : TopologicalSpace H]
  {E : Type u_3} [inst_2 : NormedAddCommGroup E] [inst_3 : NormedSpace 𝕜 E] {I : ModelWithCorners 𝕜 E H} {G : Type u_4}
  [inst_4 : TopologicalSpace G] [inst_5 : ChartedSpace H G] [inst_6 : AddGroup G] [LieAddGroup I n G] {E' : Type u_5}
  [inst_8 : NormedAddCommGroup E'] [inst_9 : NormedSpace 𝕜 E'] {H' : Type u_6} [inst_10 : TopologicalSpace H']
  {I' : ModelWithCorners 𝕜 E' H'} {G' : Type u_7} [inst_11 : TopologicalSpace G'] [inst_12 : ChartedSpace H' G']
  [inst_13 : AddGroup G'] [LieAddGroup I' n G'], LieAddGroup (I.prod I') n (G × G')