(* Iterators ****************************************************************)
(* Note: see also: lib/arithemetics/bigops.ma *)
-let rec iter (n:nat) (B:Type[0]) (op: B → B) (nil: B) ≝
+rec definition iter (n:nat) (B:Type[0]) (op: B → B) (nil: B) ≝
match n with
[ O ⇒ nil
| S k ⇒ op (iter k B op nil)
(* Trichotomy operator ******************************************************)
(* Note: this is "if eqb n1 n2 then a2 else if leb n1 n2 then a1 else a3" *)
-let rec tri (A:Type[0]) n1 n2 a1 a2 a3 on n1 : A ≝
+rec definition tri (A:Type[0]) n1 n2 a1 a2 a3 on n1 : A ≝
match n1 with
[ O ⇒ match n2 with [ O ⇒ a2 | S n2 ⇒ a1 ]
| S n1 ⇒ match n2 with [ O ⇒ a3 | S n2 ⇒ tri A n1 n2 a1 a2 a3 ]