no goals
α : Type u
β : Type v
ι : Sort w
a : α
s✝ s₁ s₂ t : Set α
p p₁ p₂ : α → Prop
inst✝ : TopologicalSpace α
s : Set α
⊢ interior s = ∅ ↔ Dense (sᶜ)
rw [dense_iff_closure_eq, closure_compl, compl_univ_iff]