∀ {α : Type u_1} {β : Type u_2} [inst : TopologicalSpace α] [inst_1 : TopologicalSpace β]
  [inst_2 : NonUnitalNonAssocSemiring β] [inst_3 : IsTopologicalSemiring β] (f g : CompactlySupportedContinuousMap α β),
  ⇑(f * g) = ⇑f * ⇑g