∀ {G : Type u_1} {X : Type u_2} [inst : MeasurableSpace X] {μ : MeasureTheory.Measure X} [inst_1 : AddGroup G]
  [inst_2 : AddAction G X] {ι : Type u_3} {u : Ultrafilter ι} {F : ι → Set X},
  IsAddFoelner G μ (↑u) F →
    ∀ (s : Set X), Filter.Tendsto (fun i => μ (s ∩ F i) / μ (F i)) (↑u) (nhds (IsAddFoelner.mean μ u F s))