renaming ...

[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 bc0b447c46da99091ecd0339ac7697c9b5f1a119..ab861be57187a8405c5fcad6e59ff7cecf6112f2 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/grammar/item.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/grammar/item.ma
@@ -12,7 +12,8 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "ground_2/arith.ma".
+include "ground_2/lib/bool.ma".
+include "ground_2/lib/arith.ma".
 
 (* ITEMS ********************************************************************)
 
@@ -41,18 +42,43 @@ inductive item2: Type[0] ≝
   | Flat2: flat2 → item2        (* non-binding item *)
 .
 
+(* Basic inversion lemmas ***************************************************)
+
+fact destruct_sort_sort_aux: ∀s1,s2. Sort s1 = Sort s2 → s1 = s2.
+#s1 #s2 #H destruct //
+qed-.
+
 (* Basic properties *********************************************************)
 
-axiom item0_eq_dec: ∀I1,I2:item0. Decidable (I1 = I2).
+lemma eq_item0_dec: ∀I1,I2:item0. Decidable (I1 = I2).
+* #i1 * #i2 [2,3,4,6,7,8: @or_intror #H destruct ]
+[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 *)
-axiom bind2_eq_dec: ∀I1,I2:bind2. Decidable (I1 = I2).
+lemma eq_bind2_dec: ∀I1,I2:bind2. Decidable (I1 = I2).
+* * /2 width=1 by or_introl/
+@or_intror #H destruct
+qed-.
 
 (* Basic_1: was: flat_dec *)
-axiom flat2_eq_dec: ∀I1,I2:flat2. Decidable (I1 = I2).
+lemma eq_flat2_dec: ∀I1,I2:flat2. Decidable (I1 = I2).
+* * /2 width=1 by or_introl/
+@or_intror #H destruct
+qed-.
 
 (* Basic_1: was: kind_dec *)
-axiom item2_eq_dec: ∀I1,I2:item2. Decidable (I1 = I2).
+lemma eq_item2_dec: ∀I1,I2:item2. Decidable (I1 = I2).
+* [ #p1 ] #I1 * [1,3: #p2 ] #I2
+[2,3: @or_intror #H destruct
+| elim (eq_bool_dec p1 p2) #Hp
+  [ elim (eq_bind2_dec I1 I2) /2 width=1 by or_introl/ #HI ]
+  @or_intror #H destruct /2 width=1 by/
+| elim (eq_flat2_dec I1 I2) /2 width=1 by or_introl/ #HI
+  @or_intror #H destruct /2 width=1 by/
+]
+qed-.
 
 (* Basic_1: removed theorems 21:
             s_S s_plus s_plus_sym s_minus minus_s_s s_le s_lt s_inj s_inc