∀ {A : Type u_1} [inst : PartialOrder A] [inst_1 : Ring A] [inst_2 : StarRing A] [inst_3 : TopologicalSpace A]
  [StarOrderedRing A] [inst_5 : Algebra ℝ A] [ContinuousFunctionalCalculus ℝ A IsSelfAdjoint] [NonnegSpectrumClass ℝ A]
  {a : A}, ¬0 ≤ a → IsUnit a → ¬0 ≤ Ring.inverse a