Metric.frontier_cthickening_subset

∀ {α : Type u} [inst : PseudoEMetricSpace α] (E : Set α) {δ : ℝ},
  frontier (Metric.cthickening δ E) ⊆ {x | Metric.infEDist x E = ENNReal.ofReal δ}

The frontier of the closed thickening of a set is contained in an Metric.infEDist level set.

Defined in: Mathlib.Topology.MetricSpace.Thickening
Cited by: 1 results in Mathlib
Foundations: Depth 151 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: PseudoEMetricSpace

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