File: Mutind.v

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Require Import List.

Program Fixpoint f a : { x : nat | x > 0 } :=
  match a with
  | 0 => 1
  | S a' => g a a'
  end
with g a b : { x : nat | x > 0 } :=
  match b with
  | 0 => 1
  | S b' => f b'
  end.

Check f.
Check g.