∀ {α : Type u_1} {β : Type u_2} [inst : TopologicalSpace α] [inst_1 : TopologicalSpace β] (f : α → Set β) (s : Set α)
  (x : α), UpperHemicontinuousWithinAt f s x = SemicontinuousWithinAt (fun x t => t ∈ nhdsSet (f x)) s x