∀ {α : Type u_1} {L : SummationFilter α} {f : α → NNReal} (motive : Summable (fun a => ↑(f a)) L → Prop)
  (x : Summable (fun a => ↑(f a)) L), (∀ (a : ℝ) (ha : HasSum (fun a => ↑(f a)) a L), motive ⋯) → motive x