isOpen_setOfPred_eventually_nhdsWithin

∀ {X : Type u_1} [inst : TopologicalSpace X] [T1Space X] {p : X → Prop},
  IsOpen {x | ∀ᶠ (y : X) in nhdsWithin x {x}ᶜ, p y}

Defined in: Mathlib.Topology.Separation.Basic
Cited by: 2 results in Mathlib
Foundations: Depth 72 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: TopologicalSpace T1Space

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