--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||M|| *)
+(* ||A|| A project by Andrea Asperti *)
+(* ||T|| *)
+(* ||I|| Developers: *)
+(* ||T|| A.Asperti, C.Sacerdoti Coen, *)
+(* ||A|| E.Tassi, S.Zacchiroli *)
+(* \ / *)
+(* \ / This file is distributed under the terms of the *)
+(* v GNU Lesser General Public License Version 2.1 *)
+(* *)
+(**************************************************************************)
+
+set "baseuri" "cic:/matita/library_autobatch/nat/plus".
+
+include "auto/nat/nat.ma".
+
+let rec plus n m \def
+ match n with
+ [ O \Rightarrow m
+ | (S p) \Rightarrow S (plus p m) ].
+
+(*CSC: the URI must disappear: there is a bug now *)
+interpretation "natural plus" 'plus x y = (cic:/matita/library_autobatch/nat/plus/plus.con x y).
+
+theorem plus_n_O: \forall n:nat. n = n+O.
+intros.elim n
+[ autobatch
+ (*simplify.
+ reflexivity*)
+| autobatch
+ (*simplify.
+ apply eq_f.
+ assumption.*)
+]
+qed.
+
+theorem plus_n_Sm : \forall n,m:nat. S (n+m) = n+(S m).
+intros.elim n
+[ autobatch
+ (*simplify.
+ reflexivity.*)
+| simplify.
+ autobatch
+ (*
+ apply eq_f.
+ assumption.*)]
+qed.
+
+theorem sym_plus: \forall n,m:nat. n+m = m+n.
+intros.elim n
+[ autobatch
+ (*simplify.
+ apply plus_n_O.*)
+| simplify.
+ autobatch
+ (*rewrite > H.
+ apply plus_n_Sm.*)]
+qed.
+
+theorem associative_plus : associative nat plus.
+unfold associative.intros.elim x
+[autobatch
+ (*simplify.
+ reflexivity.*)
+|simplify.
+ autobatch
+ (*apply eq_f.
+ assumption.*)
+]
+qed.
+
+theorem assoc_plus : \forall n,m,p:nat. (n+m)+p = n+(m+p)
+\def associative_plus.
+
+theorem injective_plus_r: \forall n:nat.injective nat nat (\lambda m.n+m).
+intro.simplify.intros 2.elim n
+[ exact H
+| autobatch
+ (*apply H.apply inj_S.apply H1.*)
+]
+qed.
+
+theorem inj_plus_r: \forall p,n,m:nat. p+n = p+m \to n=m
+\def injective_plus_r.
+
+theorem injective_plus_l: \forall m:nat.injective nat nat (\lambda n.n+m).
+intro.simplify.intros.autobatch.
+(*apply (injective_plus_r m).
+rewrite < sym_plus.
+rewrite < (sym_plus y).
+assumption.*)
+qed.
+
+theorem inj_plus_l: \forall p,n,m:nat. n+p = m+p \to n=m
+\def injective_plus_l.