∀ {P : CategoryTheory.MorphismProperty AlgebraicGeometry.Scheme} [inst : P.ContainsIdentities] [inst_1 : P.RespectsIso]
  {X Y : AlgebraicGeometry.Scheme} (f : X ⟶ Y) [inst_2 : CategoryTheory.IsIso f] (x : PUnit.{v + 1}),
  (AlgebraicGeometry.Scheme.coverOfIsIso f).f x = f