fact: Definition Pvars (vars: Vars et (carrier P) nat): Vars et A nat := λ s n, ` (vars s n).
imports: Coq.Classes.RelationClasses Coq.Classes.Morphisms Coq.Program.Program MathClasses.interfaces.abstract_algebra MathClasses.interfaces.universal_algebra MathClasses.interfaces.canonical_names MathClasses.theory.ua_subalgebra