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Martin Dvořák 2024-10-03 21:07:04 +02:00 committed by GitHub
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@ -256,7 +256,7 @@ We now state Collatz conjecture. The proof is left as an exercise to the reader.
def collatz_next (n : Nat) : Nat := def collatz_next (n : Nat) : Nat :=
if n % 2 = 0 then n / 2 else 3 * n + 1 if n % 2 = 0 then n / 2 else 3 * n + 1
def iter (k : Nat) (f: Nat → Nat) := def iter (k : Nat) (f : Nat → Nat) :=
match k with match k with
| Nat.zero => fun x => x | Nat.zero => fun x => x
| Nat.succ k' => fun x => f (iter k' f x) | Nat.succ k' => fun x => f (iter k' f x)