∀ {K : Type u_1} [inst : NontriviallyNormedField K] [inst_1 : IsUltrametricDist K]
  [IsDiscreteValuationRing ↥(Valued.integer K)] {ϖ : ↥(Valued.integer K)},
  Irreducible ϖ → ↑(Valued.maximalIdeal K) = Metric.closedBall 0 ‖ϖ‖