fact: Axiom Lookup_def: forall p cn msig cn' m , Lookup p cn msig = Some (cn',m) <-> lookup p cn msig (cn',m).
imports: Coq(List) Coq(ListSet) Coq(FSetInterface) Coq(Bool) Coq(ZArith) Coq(Relation_Operators) JML(ListHelpers)