fact: Definition rel_enumerates (R : GRelation nat U) := rel_surjection Full_set A R.
imports: Coq(Ensembles Arith ArithRing Wellfounded Relations Wf_nat Finite_sets Logic.Epsilon Sets.Image Lia) ZornsLemma(Classical_Wf CountableTypes Families) hydras(MoreEpsilonIota PartialFun GRelations Prelude.More_Arith)