Definition Representable (n : nat) (f : naryFunc n) 
  (A : Formula) : Prop :=
  (forall v : nat, In v (freeVarFormula LNN A) -> v <= n) /\
  RepresentableHelp n f A.

Lemma Representable_ext : forall (n : nat) (f g : naryFunc n) (A : Formula), extEqual n f g -> RepresentableHelp n f A -> RepresentableHelp n g A.