+++ /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 "datatypes/Nat.ma".
-
-inductive NPlus (p:Nat): Nat → Nat → Prop ≝
- | nplus_zero_2: NPlus p zero p
- | nplus_succ_2: ∀q, r. NPlus p q r → NPlus p (succ q) (succ r).
-
-interpretation "natural plus predicate" 'rel_plus x y z = (NPlus x y z).
-
-notation "hvbox(a break ⊕ b break ≍ c)"
- non associative with precedence 45
-for @{'rel_plus $a $b $c}.