DiscreteQuotient.isClopen_preimage

∀ {X : Type u_2} [inst : TopologicalSpace X] (S : DiscreteQuotient X) (A : Set (Quotient S.toSetoid)),
  IsClopen (S.proj ⁻¹' A)

Defined in: Mathlib.Topology.DiscreteQuotient
Cited by: 3 results in Mathlib
Foundations: Depth 72 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: TopologicalSpace

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