∀ {α : Type u_1} {β : Type u_2} [inst : CommMonoid α] [inst_1 : TopologicalSpace α] {L : SummationFilter β} {f : β → α}
  [T2Space α] [L.NeBot] [L.LeAtTop], Multipliable f → ∏'[L] (b : β), f b = ∏' (b : β), f b