fact: Definition msgid_hinv n (h : list Label) := NoDup (map label_num h) /\ Forall (fun l => label_num l <= n) h.
imports: Coq(FunctionalExtensionality Arith Lia) Coq(Arith.Peano_dec Arith.Compare_dec) Coq(Relations.Relation_Operators) Coq(List) Chapar(Predefs)