∀ {α : Type u_1} [inst : TopologicalSpace α] {s : Set α} {γ : Type u_5} [inst_1 : AddCommMonoid γ]
  [inst_2 : LinearOrder γ] [IsOrderedAddMonoid γ] [inst_4 : TopologicalSpace γ] [OrderTopology γ] [ContinuousAdd γ]
  {f g : α → γ}, UpperSemicontinuousOn f s → UpperSemicontinuousOn g s → UpperSemicontinuousOn (fun z => f z + g z) s