Commit b897f00c authored by Robbert Krebbers's avatar Robbert Krebbers

Add `Nat_iter_add`.

parent df509b21
Pipeline #12784 passed with stage
in 14 minutes and 3 seconds
......@@ -92,7 +92,11 @@ Proof. intros Hxy Hy ->. by apply Hy, Nat.divide_0_l. Qed.
Lemma Nat_iter_S {A} n (f: A A) x : Nat.iter (S n) f x = f (Nat.iter n f x).
Proof. done. Qed.
Lemma Nat_iter_S_r {A} n (f: A A) x : Nat.iter (S n) f x = Nat.iter n f (f x).
Proof. induction n; f_equal/=; auto. Qed.
Proof. induction n; by f_equal/=. Qed.
Lemma Nat_iter_add {A} n1 n2 (f : A A) x :
Nat.iter (n1 + n2) f x = Nat.iter n1 f (Nat.iter n2 f x).
Proof. induction n1; by f_equal/=. Qed.
Lemma Nat_iter_ind {A} (P : A Prop) f x k :
P x ( y, P y P (f y)) P (Nat.iter k f x).
Proof. induction k; simpl; auto. Qed.
......
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