X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fapps_2%2Fmodels%2Fveq.ma;h=7f6e8b78979d5f9e61055435b218f6e569ccc3a6;hp=e784d3b7a8148c05e71034929822171fbfb9af43;hb=41b61472d2c475e0f69e3dfc85539da3ad2bac1e;hpb=ff612dc35167ec0c145864c9aa8ae5e1ebe20a48

diff --git a/matita/matita/contribs/lambdadelta/apps_2/models/veq.ma b/matita/matita/contribs/lambdadelta/apps_2/models/veq.ma
index e784d3b7a..7f6e8b789 100644
--- a/matita/matita/contribs/lambdadelta/apps_2/models/veq.ma
+++ b/matita/matita/contribs/lambdadelta/apps_2/models/veq.ma
@@ -14,7 +14,7 @@
 
 include "apps_2/models/model_props.ma".
 
-(* EVALUATION EQUIVALENCE  **************************************************)
+(* EVALUATION EQUIVALENCE ***************************************************)
 
 definition veq (M): relation (evaluation M) ≝
                     λv1,v2. ∀d. v1 d ≗ v2 d.
@@ -26,11 +26,11 @@ interpretation "evaluation equivalence (model)"
 
 lemma veq_refl (M): is_model M →
                     reflexive … (veq M).
-/2 width=1 by mq/ qed.
+/2 width=1 by mr/ qed.
 
 lemma veq_repl (M): is_model M →
                     replace_2 … (veq M) (veq M) (veq M).
-/2 width=5 by mr/ qed-.
+/2 width=5 by mq/ qed-.
 
 lemma veq_sym (M): is_model M → symmetric … (veq M).
 /3 width=5 by veq_repl, veq_refl/ qed-.
@@ -38,39 +38,39 @@ lemma veq_sym (M): is_model M → symmetric … (veq M).
 lemma veq_trans (M): is_model M → Transitive … (veq M).
 /3 width=5 by veq_repl, veq_refl/ qed-.
 
-(* Properties with extebsional equivalence **********************************)
+lemma veq_canc_sn (M): is_model M → left_cancellable … (veq M).
+/3 width=3 by veq_trans, veq_sym/ qed-.
 
-lemma ext_veq (M): is_model M →
-                   ∀lv1,lv2. lv1 ≐ lv2 → lv1 ≗{M} lv2.
-/2 width=1 by mq/ qed.
+lemma veq_canc_dx (M): is_model M → right_cancellable … (veq M).
+/3 width=3 by veq_trans, veq_sym/ qed-.
 
-lemma veq_repl_exteq (M): is_model M →
-                          replace_2 … (veq M) (exteq …) (exteq …).
-/2 width=5 by mr/ qed-.
+(* Properties with evaluation lift ******************************************)
 
-lemma exteq_veq_trans (M): ∀lv1,lv. lv1 ≐ lv →
-                           ∀lv2. lv ≗{M} lv2 → lv1 ≗ lv2.
-// qed-.
-
-(* Properties with evaluation evaluation lift *******************************)
-
-theorem vlift_swap (M): ∀i1,i2. i1 ≤ i2 →
-                        ∀lv,d1,d2. ⫯[i1←d1] ⫯[i2←d2] lv ≐{?,dd M} ⫯[↑i2←d2] ⫯[i1←d1] lv.
-#M #i1 #i2 #Hi12 #lv #d1 #d2 #j
+theorem vlift_swap (M): is_model M →
+                        ∀i1,i2. i1 ≤ i2 →
+                        ∀lv,d1,d2. ⫯[i1←d1] ⫯[i2←d2] lv ≗{M} ⫯[↑i2←d2] ⫯[i1←d1] lv.
+#M #HM #i1 #i2 #Hi12 #lv #d1 #d2 #j
 elim (lt_or_eq_or_gt j i1) #Hji1 destruct
-[ >vlift_lt // >vlift_lt /2 width=3 by lt_to_le_to_lt/
-  >vlift_lt /3 width=3 by lt_S, lt_to_le_to_lt/ >vlift_lt //
-| >vlift_eq >vlift_lt /2 width=1 by monotonic_le_plus_l/ >vlift_eq //
+[ lapply (lt_to_le_to_lt … Hji1 Hi12) #Hji2
+  >vlift_lt // >vlift_lt // >vlift_lt /2 width=1 by lt_S/ >vlift_lt //
+  /2 width=1 by veq_refl/
+| >vlift_eq >vlift_lt /2 width=1 by monotonic_le_plus_l/ >vlift_eq
+  /2 width=1 by mr/
 | >vlift_gt // elim (lt_or_eq_or_gt (↓j) i2) #Hji2 destruct
   [ >vlift_lt // >vlift_lt /2 width=1 by lt_minus_to_plus/ >vlift_gt //
-  | >vlift_eq <(lt_succ_pred … Hji1) >vlift_eq //
-  | >vlift_gt // >vlift_gt /2 width=1 by lt_minus_to_plus_r/ >vlift_gt /2 width=3 by le_to_lt_to_lt/
+    /2 width=1 by veq_refl/
+  | >vlift_eq <(lt_succ_pred … Hji1) >vlift_eq
+    /2 width=1 by mr/
+  | lapply (le_to_lt_to_lt … Hi12 Hji2) #Hi1j
+    >vlift_gt // >vlift_gt /2 width=1 by lt_minus_to_plus_r/ >vlift_gt //
+    /2 width=1 by veq_refl/
   ]
 ]
-qed-.
+qed.
 
-lemma vlift_comp (M): ∀i. compatible_3 … (vlift M i) (sq M) (veq M) (veq M).
-#m #i #d1 #d2 #Hd12 #lv1 #lv2 #HLv12 #j
+lemma vlift_comp (M): is_model M →
+                      ∀i. compatible_3 … (vlift M i) (sq M) (veq M) (veq M).
+#M #HM #i #d1 #d2 #Hd12 #lv1 #lv2 #HLv12 #j
 elim (lt_or_eq_or_gt j i) #Hij destruct
 [ >vlift_lt // >vlift_lt //
 | >vlift_eq >vlift_eq //
@@ -80,21 +80,16 @@ qed-.
 
 (* Properies with term interpretation ***************************************) 
 
-lemma ti_comp_l (M): is_model M →
-                     ∀T,gv,lv1,lv2. lv1 ≗{M} lv2 →
-                     ⟦T⟧[gv, lv1] ≗ ⟦T⟧[gv, lv2].
+lemma ti_comp (M): is_model M →
+                   ∀T,gv1,gv2. gv1 ≗ gv2 → ∀lv1,lv2. lv1 ≗ lv2 →
+                   ⟦T⟧[gv1, lv1] ≗{M} ⟦T⟧[gv2, lv2].
 #M #HM #T elim T -T * [||| #p * | * ]
-[ /4 width=3 by seq_trans, seq_sym, ms/
-| /4 width=5 by seq_sym, ml, mr/
+[ /4 width=5 by seq_trans, seq_sym, ms/
+| /4 width=5 by seq_sym, ml, mq/
 | /4 width=3 by seq_trans, seq_sym, mg/
-| /5 width=5 by vlift_comp, seq_sym, md, mr/
-| /5 width=1 by vlift_comp, mi, mq/
-| /4 width=5 by seq_sym, ma, mc, mr/
-| /4 width=5 by seq_sym, me, mr/
+| /5 width=5 by vlift_comp, seq_sym, md, mq/
+| /5 width=1 by vlift_comp, mi, mr/
+| /4 width=5 by seq_sym, ma, mp, mq/
+| /4 width=5 by seq_sym, me, mq/
 ]
 qed.
-
-lemma ti_ext_l (M): is_model M →
-                    ∀T,gv,lv1,lv2. lv1 ≐ lv2 →
-                    ⟦T⟧[gv, lv1] ≗{M} ⟦T⟧[gv, lv2].
-/3 width=1 by ti_comp_l, ext_veq/ qed.