∀ {ι α : Type u} {c : Cardinal.{u}} {l : Filter α} [CardinalInterFilter l c] {S : Set ι},
  Cardinal.mk ↑S < c →
    ∀ {p : α → (i : ι) → i ∈ S → Prop},
      (∀ᶠ (x : α) in l, ∀ (i : ι) (hi : i ∈ S), p x i hi) ↔ ∀ (i : ι) (hi : i ∈ S), ∀ᶠ (x : α) in l, p x i hi