∀ {α : Type u_2} {β : Type u_3} [inst : TopologicalSpace α] [inst_1 : TopologicalSpace β] [inst_2 : AddCommMonoid β]
  [inst_3 : ContinuousAdd β] {ι : Type u_5} (s : Finset ι) (f : ι → CompactlySupportedContinuousMap α β) (a : α),
  (∑ i ∈ s, f i) a = ∑ i ∈ s, (f i) a