X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambda_delta%2FBasic_2%2Fgrammar%2Fterm.ma;h=42e7b8633a851ecc8e3bf93717455b62b5b3692a;hb=9aa9a54946719d3fdb4cadb7c7d33fd13956c083;hp=ce8357d21bb0d283609706d73aeb79e751011630;hpb=aec661d51ffa04b4248cdfece772b58780737e3f;p=helm.git

diff --git a/matita/matita/contribs/lambda_delta/Basic_2/grammar/term.ma b/matita/matita/contribs/lambda_delta/Basic_2/grammar/term.ma
index ce8357d21..42e7b8633 100644
--- a/matita/matita/contribs/lambda_delta/Basic_2/grammar/term.ma
+++ b/matita/matita/contribs/lambda_delta/Basic_2/grammar/term.ma
@@ -41,19 +41,27 @@ interpretation "term flat construction (binary)" 'SFlat I T1 T2 = (TPair (Flat I
 lemma discr_tpair_xy_x: ∀I,T,V. 𝕔{I} V. T = V → False.
 #I #T #V elim V -V
 [ #J #H destruct
-| #J #W #U #IHW #_ #H destruct -I /2/ (**) (* improve context after destruct *)
+| #J #W #U #IHW #_ #H destruct
+  -H >e0 in e1; normalize (**) (* destruct: one quality is not simplified, the destucted equality is not erased *)
+  /2 width=1/
 ]
-qed.
+qed-.
 
 (* Basic_1: was: thead_x_y_y *)
 lemma discr_tpair_xy_y: ∀I,V,T. 𝕔{I} V. T = T → False.
 #I #V #T elim T -T
 [ #J #H destruct
-| #J #W #U #_ #IHU #H destruct -I V /2/ (**) (* improve context after destruct *)
+| #J #W #U #_ #IHU #H destruct
+  -H (**) (* destruct: the destucted equality is not erased *)
+  /2 width=1/
 ]
-qed.
+qed-.
 
 (* Basic properties *********************************************************)
 
 (* Basic_1: was: term_dec *)
 axiom term_eq_dec: ∀T1,T2:term. Decidable (T1 = T2).
+
+(* Basic_1: removed theorems 3:
+            not_void_abst not_abbr_void not_abst_void
+*)