+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||M|| *)
-(* ||A|| A project by Andrea Asperti *)
-(* ||T|| *)
-(* ||I|| Developers: *)
-(* ||T|| The HELM team. *)
-(* ||A|| http://helm.cs.unibo.it *)
-(* \ / *)
-(* \ / This file is distributed under the terms of the *)
-(* v GNU General Public License Version 2 *)
-(* *)
-(**************************************************************************)
-
-include "ground/arith/pnat.ma".
-
-(* DISCRIMINATOR FOR POSITIVE INTEGERS **************************************)
-
-definition pdis (A:Type[0]) (a) (f) (p): A ≝
-match p with
-[ punit ⇒ a
-| psucc q ⇒ f q
-].