Metric.subset_compl_thickening_compl_thickening_self

∀ {α : Type u} [inst : PseudoEMetricSpace α] (δ : ℝ) (E : Set α), E ⊆ (Metric.thickening δ (Metric.thickening δ E)ᶜ)ᶜ

Any set is contained in the complement of the δ-thickening of the complement of its δ-thickening.

Defined in: Mathlib.Topology.MetricSpace.Thickening
Cited by: 2 results in Mathlib
Foundations: Depth 149 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: PseudoEMetricSpace

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