∀ {X Y Z : AlgebraicGeometry.Scheme} (f : X ⟶ Y) (g : Y ⟶ Z),
  (TopologicalSpace.Opens.map (CategoryTheory.CategoryStruct.comp f g).base).IsContinuous
    (Opens.grothendieckTopology ↥Z) (Opens.grothendieckTopology ↥X)