(* *)
(**************************************************************************)
+include "ground_2/lib/bool.ma".
include "ground_2/lib/arith.ma".
(* ITEMS ********************************************************************)
(* Basic properties *********************************************************)
-axiom eq_item0_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 ]
+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 eq_bind2_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 eq_flat2_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 eq_item2_dec: ∀I1,I2:item2. Decidable (I1 = I2).
+lemma eq_item2_dec: ∀I1,I2:item2. Decidable (I1 = I2).
+* [ #a1 ] #I1 * [1,3: #a2 ] #I2
+[2,3: @or_intror #H destruct
+| elim (eq_bool_dec a1 a2) #Ha
+ [ 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