(* *)
(**************************************************************************)
-set "baseuri" "cic:/matita/RELATIONAL/NPlus/fun".
+
include "NPlus/inv.ma".
intros 4. elim H; clear H q r1;
[ lapply linear nplus_inv_zero_2 to H1
| lapply linear nplus_inv_succ_2 to H3. decompose
- ]; subst; autobatch.
+ ]; destruct; autobatch.
qed.
theorem nplus_inj_1: \forall p1, q, r. (p1 + q == r) \to