gauge_ball

∀ {E : Type u_2} [inst : SeminormedAddCommGroup E] [inst_1 : NormedSpace ℝ E] {r : ℝ},
  0 ≤ r → ∀ (x : E), gauge (Metric.ball 0 r) x = ‖x‖ / r

Defined in: Mathlib.Analysis.Convex.Gauge
Cited by: 3 results in Mathlib
Foundations: Depth 159 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: SeminormedAddCommGroup NormedSpace

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