∀ {α : Type u_1} {ε : Type u_3} {mα : MeasurableSpace α} {f : α → ε} {μ : MeasureTheory.Measure α}
  [inst : TopologicalSpace ε] [inst_1 : ContinuousENorm ε] [inst_2 : Preorder α] [IsCodirectedOrder α] [Nonempty α],
  MeasureTheory.IntegrableAtFilter f Filter.atBot μ ↔ ∃ a, MeasureTheory.IntegrableOn f (Set.Iic a) μ