{𝕜 : Type u} →
  {A : Type v} →
    [inst : NontriviallyNormedField 𝕜] →
      [inst_1 : NonUnitalNormedRing A] →
        [inst_2 : NormedSpace 𝕜 A] →
          [inst_3 : SMulCommClass 𝕜 A A] →
            [inst_4 : IsScalarTower 𝕜 A A] →
              (fst snd : A →L[𝕜] A) → (∀ (x y : A), snd x * y = x * fst y) → DoubleCentralizer 𝕜 A