Section Characterisation_wf_relations.
(** Wellfounded relations are the inverse image of wellordering types *)
(*  in course of development                                          *)
Variable A : Type.
Variable leA : A -> A -> Prop.
Definition B (a:A) := {x : A | leA x a}.

(* Specifications: *)
Theorem wof : well_founded leA -> A -> WO A B.
End Characterisation_wf_relations.