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Theorems · Theorem · general topology

finite_cover_nhds_interior

∀ {X : Type u} [inst : TopologicalSpace X] [CompactSpace X] {U : X → Set X},
  (∀ (x : X), U x ∈ nhds x) → ∃ t, ⋃ x ∈ t, interior (U x) = Set.univ
Defined in
Mathlib.Topology.Compactness.Compact
Cited by
1 results in Mathlib
Foundations
Depth 78 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes
TopologicalSpaceCompactSpace

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