X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fmatita%2Flibrary%2FZ%2Fcompare.ma;h=3b259b4f664b0b19d1d8ec646596600e135e693e;hb=2ecd65dbcc1388bb2dfe6425e6ef1b2e3f45c4ac;hp=d2e075d26cb159377bed4dafd00b9912ac71891d;hpb=15753bd130b39be9854894898154163ba036d4b0;p=helm.git

diff --git a/helm/matita/library/Z/compare.ma b/helm/matita/library/Z/compare.ma
index d2e075d26..3b259b4f6 100644
--- a/helm/matita/library/Z/compare.ma
+++ b/helm/matita/library/Z/compare.ma
@@ -16,8 +16,6 @@ set "baseuri" "cic:/matita/Z/compare".
 
 include "Z/orders.ma".
 include "nat/compare.ma".
-include "datatypes/bool.ma".
-include "datatypes/compare.ma".
 
 (* boolean equality *)
 definition eqZb : Z \to Z \to bool \def
@@ -44,21 +42,24 @@ theorem eqZb_to_Prop:
 match eqZb x y with
 [ true \Rightarrow x=y
 | false \Rightarrow \lnot x=y].
-intros.elim x.
-elim y.
-simplify.reflexivity.
-simplify.apply not_eq_OZ_neg.
-simplify.apply not_eq_OZ_pos.
-elim y.
-simplify.intro.apply not_eq_OZ_neg n ?.apply sym_eq.assumption.
-simplify.apply eqb_elim.intro.simplify.apply eq_f.assumption.
-intro.simplify.intro.apply H.apply inj_neg.assumption.
-simplify.intro.apply not_eq_pos_neg n1 n ?.apply sym_eq.assumption.
-elim y.
-simplify.intro.apply not_eq_OZ_pos n ?.apply sym_eq.assumption.
-simplify.apply not_eq_pos_neg.
-simplify.apply eqb_elim.intro.simplify.apply eq_f.assumption.
-intro.simplify.intro.apply H.apply inj_pos.assumption.
+intros.
+elim x.
+  elim y.
+    simplify.reflexivity.
+    simplify.apply not_eq_OZ_pos.
+    simplify.apply not_eq_OZ_neg.
+  elim y.
+    simplify.intro.apply not_eq_OZ_pos n.apply sym_eq.assumption.
+    simplify.apply eqb_elim.
+      intro.simplify.apply eq_f.assumption.
+      intro.simplify.intro.apply H.apply inj_pos.assumption.
+    simplify.apply not_eq_pos_neg.
+  elim y.
+    simplify.intro.apply not_eq_OZ_neg n.apply sym_eq.assumption.
+    simplify.intro.apply not_eq_pos_neg n1 n.apply sym_eq.assumption.
+    simplify.apply eqb_elim.
+      intro.simplify.apply eq_f.assumption.
+      intro.simplify.intro.apply H.apply inj_neg.assumption.
 qed.
 
 theorem eqZb_elim: \forall x,y:Z.\forall P:bool \to Prop.
@@ -100,44 +101,43 @@ theorem Z_compare_to_Prop :
 | EQ \Rightarrow x=y
 | GT \Rightarrow y < x]. 
 intros.
-elim x. elim y.
-simplify.apply refl_eq.
-simplify.exact I.
-simplify.exact I.
-elim y. simplify.exact I.
-simplify. 
-(*CSC: qui uso le perche' altrimenti ci sono troppe scelte
-  per via delle coercions! *)
-cut match (nat_compare n1 n) with
-[ LT \Rightarrow n1<n
-| EQ \Rightarrow n1=n
-| GT \Rightarrow n<n1] \to 
-match (nat_compare n1 n) with
-[ LT \Rightarrow (le (S n1) n)
-| EQ \Rightarrow neg n = neg n1
-| GT \Rightarrow (le (S n) n1)]. 
-apply Hcut. apply nat_compare_to_Prop. 
-elim (nat_compare n1 n).
-simplify.exact H.
-simplify.exact H.
-simplify.apply eq_f.apply sym_eq.exact H.
-simplify.exact I.
-elim y.simplify.exact I.
-simplify.exact I.
-simplify.
-(*CSC: qui uso le perche' altrimenti ci sono troppe scelte
-  per via delle coercions! *)
-cut match (nat_compare n n1) with
-[ LT \Rightarrow n<n1
-| EQ \Rightarrow n=n1
-| GT \Rightarrow n1<n] \to 
-match (nat_compare n n1) with
-[ LT \Rightarrow (le (S n) n1)
-| EQ \Rightarrow pos n = pos n1
-| GT \Rightarrow (le (S n1) n)]. 
-apply Hcut. apply nat_compare_to_Prop. 
-elim (nat_compare n n1).
-simplify.exact H.
-simplify.exact H.
-simplify.apply eq_f.exact H.
+elim x. 
+  elim y.
+    simplify.apply refl_eq.
+    simplify.exact I.
+    simplify.exact I.
+  elim y.
+    simplify.exact I.
+    simplify.
+      cut match (nat_compare n n1) with
+      [ LT \Rightarrow n<n1
+      | EQ \Rightarrow n=n1
+      | GT \Rightarrow n1<n] \to 
+      match (nat_compare n n1) with
+      [ LT \Rightarrow (S n) \leq n1
+      | EQ \Rightarrow pos n = pos n1
+      | GT \Rightarrow (S n1) \leq n]. 
+        apply Hcut.apply nat_compare_to_Prop. 
+        elim (nat_compare n n1).
+          simplify.exact H.
+          simplify.apply eq_f.exact H.
+          simplify.exact H.
+    simplify.exact I.    
+  elim y. 
+    simplify.exact I.
+    simplify.exact I.
+    simplify. 
+      cut match (nat_compare n1 n) with
+      [ LT \Rightarrow n1<n
+      | EQ \Rightarrow n1=n
+      | GT \Rightarrow n<n1] \to 
+      match (nat_compare n1 n) with
+      [ LT \Rightarrow (S n1) \leq n
+      | EQ \Rightarrow neg n = neg n1
+      | GT \Rightarrow (S n) \leq n1]. 
+        apply Hcut. apply nat_compare_to_Prop. 
+        elim (nat_compare n1 n).
+          simplify.exact H.
+          simplify.apply eq_f.apply sym_eq.exact H.
+          simplify.exact H.
 qed.