preimage_add_ball

∀ {E : Type u_5} [inst : SeminormedAddCommGroup E] (a b : E) (r : ℝ),
  (fun x => b + x) ⁻¹' Metric.ball a r = Metric.ball (a - b) r

Defined in: Mathlib.Analysis.Normed.Group.Basic
Cited by: 3 results in Mathlib
Foundations: Depth 92 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: SeminormedAddCommGroup

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