(* QuickChick Prelude *)
Set Warnings "-extraction-opaque-accessed,-extraction".
Set Warnings "-notation-overridden,-parsing".
Set Bullet Behavior "Strict Subproofs".
(* End prelude *)
Require Export Basics.
Admitted. (* QuickChick plus_n_O_firsttry. *)

Theorem minus_diag : forall n,
minus n n = 0.