-- Module: Mathlib.NumberTheory.LocalField.Basic
Goal:
K : Type u_1
inst : Field K
inst_1 : ValuativeRel K
inst_2 : TopologicalSpace K
inst_3 : IsNonarchimedeanLocalField K
γ : K
hγ : ¬γ = 0
this_1 : UniformSpace K := IsTopologicalAddGroup.rightUniformSpace K
this : IsUniformAddGroup K := ⋯
s : Set K
hs : Membership.mem (γ := Filter K) (nhds 0) s
hs' : IsCompact s
r : K
hr : r ≠ 0
hr1 :
  LT.lt (α := ValueGroupWithZero K) ((valuation K : (a : K) → ValueGroupWithZero K) r : ValueGroupWithZero K)
    (1 : ValueGroupWithZero K)
H :
  {x : K |
      LE.le (α :=
        MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K) (↑(valuation K) : K →*₀ ValueGroupWithZero K))
        ((Valuation.restrict (valuation K) :
              (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
            x :
          MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K) (↑(valuation K) : K →*₀ ValueGroupWithZero K))
        ((Valuation.restrict (valuation K) :
              (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
            r :
          MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
            (↑(valuation K) : K →*₀ ValueGroupWithZero K))} ⊆
    s
h :
  ∀ (x : K),
    Membership.mem (γ := Set K)
        {x : K |
          LE.le (α :=
            MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
              (↑(valuation K) : K →*₀ ValueGroupWithZero K))
            ((Valuation.restrict (valuation K) :
                  (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
                x :
              MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
                (↑(valuation K) : K →*₀ ValueGroupWithZero K))
            ((Valuation.restrict (valuation K) :
                  (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
                γ :
              MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
                (↑(valuation K) : K →*₀ ValueGroupWithZero K))}
        x ↔
      Membership.mem (γ := Set K)
        (Set.preimage (β := K) (⇑(Homeomorph.toEquiv (Homeomorph.mulLeft₀ (γ / r) ⋯)).symm : (a : K) → K)
          {x : K |
            LE.le (α :=
              MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K) (↑Valued.v : K →*₀ ValueGroupWithZero K))
              ((Valuation.restrict Valued.v :
                    (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑Valued.v : K →*₀ ValueGroupWithZero K))
                  x :
                MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
                  (↑Valued.v : K →*₀ ValueGroupWithZero K))
              ((Valuation.restrict (valuation K) :
                    (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
                  r :
                MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
                  (↑(valuation K) : K →*₀ ValueGroupWithZero K))})
        x
⊢ Eq (α := Set K)
    {x : K |
      LE.le (α :=
        MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K) (↑(valuation K) : K →*₀ ValueGroupWithZero K))
        ((Valuation.restrict (valuation K) :
              (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
            x :
          MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K) (↑(valuation K) : K →*₀ ValueGroupWithZero K))
        ((Valuation.restrict (valuation K) :
              (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
            γ :
          MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
            (↑(valuation K) : K →*₀ ValueGroupWithZero K))}
    (Set.preimage (β := K) (⇑(Homeomorph.toEquiv (Homeomorph.mulLeft₀ (γ / r) ⋯)).symm : (a : K) → K)
      {x : K |
        LE.le (α :=
          MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K) (↑Valued.v : K →*₀ ValueGroupWithZero K))
          ((Valuation.restrict Valued.v :
                (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑Valued.v : K →*₀ ValueGroupWithZero K))
              x :
            MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K) (↑Valued.v : K →*₀ ValueGroupWithZero K))
          ((Valuation.restrict (valuation K) :
                (a : K) → MonoidWithZeroHom.ValueGroup₀ (↑(valuation K) : K →*₀ ValueGroupWithZero K))
              r :
            MonoidWithZeroHom.ValueGroup₀ (F := K →*₀ ValueGroupWithZero K)
              (↑(valuation K) : K →*₀ ValueGroupWithZero K))})

Tactic:
ext x