fact: Definition seq_range (f : nat -> U) : Ensemble U := image Full_set f.
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)