X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fcontribs%2FRELATIONAL%2FNLE%2Ffwd.ma;h=6a78e0aac788bce7a77661c3bc93b213fec70b3b;hb=00305d361464ea4c1c071b9be29482198d521eda;hp=dd0a7cea6a958fb9af6de022a7f9a7d5eabedf24;hpb=216686b3739474d279c87892892af82c5ea5aec3;p=helm.git

diff --git a/matita/contribs/RELATIONAL/NLE/fwd.ma b/matita/contribs/RELATIONAL/NLE/fwd.ma
index dd0a7cea6..6a78e0aac 100644
--- a/matita/contribs/RELATIONAL/NLE/fwd.ma
+++ b/matita/contribs/RELATIONAL/NLE/fwd.ma
@@ -20,11 +20,11 @@ include "Nat/fwd.ma".
 include "NLE/defs.ma".
 
 theorem nle_gen_succ_1: \forall x,y. x < y \to 
-                         \exists z. y = succ z \land x <= z.
+                        \exists z. y = succ z \land x <= z.
  intros. inversion H; clear H; intros;
  [ apply (eq_gen_succ_zero ? ? H)
  | lapply linear eq_gen_succ_succ to H2 as H0.
-   rewrite > H0. clear H0.
+   subst.
    apply ex_intro; [|auto] (**)
  ].
 qed.
@@ -34,8 +34,7 @@ theorem nle_gen_succ_succ: \forall x,y. x < succ y \to x <= y.
  [ apply (eq_gen_succ_zero ? ? H)
  | lapply linear eq_gen_succ_succ to H2 as H0.
    lapply linear eq_gen_succ_succ to H3 as H2.
-   rewrite > H0. rewrite > H2. clear H0 H2.
-   auto
+   subst. auto
  ].
 qed.
 
@@ -53,7 +52,7 @@ theorem nle_gen_zero_2: \forall x. x <= zero \to x = zero.
 qed.
 
 theorem nle_gen_succ_2: \forall y,x. x <= succ y \to
-                         x = zero \lor \exists z. x = succ z \land z <= y.
+                        x = zero \lor \exists z. x = succ z \land z <= y.
  intros 2; elim x; clear x; intros;
  [ auto
  | lapply linear nle_gen_succ_succ to H1.