fact: Definition eq_Setoid@{u} (A : Type@{u}) : Setoid@{u u} A := Build_Setoid@{u _} A (λ f g, eq f g) eq_equivalence@{u u}.
imports: Coq.Classes.RelationClasses Coq.Setoids.Setoid Coq.Vectors.Fin Category.Lib.Foundation