IsOpen

{X : Type u} → [TopologicalSpace X] → Set X → Prop

IsOpen s means that s is open in the ambient topological space on X

Defined in: Mathlib.Topology.Defs.Basic
Cited by: 2,400 results in Mathlib
Foundations: Depth 2 from the axioms, rests on 4 definitions · uses no axioms
Assumes: TopologicalSpace

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