ground_2 milestone: multiple relocation with lists of booleans

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / grammar / item.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/grammar/item.ma b/matita/matita/contribs/lambdadelta/basic_2/grammar/item.ma
index 99260ba797a31f4337c78d4782a4aeb490a76621..cb69d3687b3476b60b390b8711f536a59763a442 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/grammar/item.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/grammar/item.ma
@@ -42,12 +42,18 @@ inductive item2: Type[0] ≝
   | Flat2: flat2 → item2        (* non-binding item *)
 .
 
+(* Basic inversion lemmas ***************************************************)
+
+fact destruct_sort_sort_aux: ∀k1,k2. Sort k1 = Sort k2 → k1 = k2.
+#k1 #k2 #H destruct //
+qed-.
+
 (* Basic properties *********************************************************)
 
 lemma eq_item0_dec: ∀I1,I2:item0. Decidable (I1 = I2).
 * #i1 * #i2 [2,3,4,6,7,8: @or_intror #H destruct ]
-elim (eq_nat_dec i1 i2) /2 width=1 by or_introl/
-#Hni12 @or_intror #H destruct /2 width=1 by/ 
+[2: elim (eq_nat_dec i1 i2) |1,3: elim (eq_nat_dec i1 i2) ] /2 width=1 by or_introl/
+#Hni12 @or_intror #H destruct /2 width=1 by/
 qed-.
 
 (* Basic_1: was: bind_dec *)