Section Ignore_Params.
Fixpoint ignoreParams (n m : nat) (f : naryFunc n) {struct m} :
naryFunc (m + n) :=
match m return (naryFunc (m + n)) with
| O => f
| S x => fun _ => ignoreParams n x f
end.
Definition projectionListPR (n m : nat) (p : m <= n) : PrimRecs n m.
intros.
induction m as [| m Hrecm].
exact (PRnil n).
assert (m < n).
apply lt_S_n.
apply le_lt_n_Sm.
apply p.
apply (PRcons _ m (projFunc _ _ H)).
apply Hrecm.
apply le_S_n.
apply le_S.
apply p.
Defined.
Definition projectionList (n m : nat) (p : m <= n) :
Vector.t (naryFunc n) m := evalPrimRecs n m (projectionListPR n m p).
End Ignore_Params.

Lemma compose2IsPR :
forall (n : nat) (f : naryFunc n) (p : isPR n f) (g : naryFunc (S n))
(q : isPR (S n) g), isPR n (compose2 n f g).