∀ (S : CategoryTheory.Functor Type u_1ᵒᵖ (Type u_1)),
  CategoryTheory.Presieve.IsSheaf CategoryTheory.typesGrothendieckTopology S →
    ∀ (α : Type u_1), CategoryTheory.Presieve.IsSheafFor S (CategoryTheory.discretePresieve α)