module Classes:Coq typeclassessig..end
val mk_morphism : Term.constr -> Term.constr -> Term.constr -> Term.constrval mk_equivalence : Term.constr -> Term.constr -> Term.constrval mk_reflexive : Term.constr -> Term.constr -> Term.constrval mk_transitive : Term.constr -> Term.constr -> Term.constr