some restyling ...

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / dynamic / cnv_cpes.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpes.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpes.ma
index c7da941590a5815b2a641d6ced968601c48e4405..190165fe69e170eae398f38e1be0c2d58a6d59b3 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpes.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpes.ma
@@ -12,43 +12,51 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "basic_2/rt_computation/cpms_cpms.ma".
 include "basic_2/rt_equivalence/cpes.ma".
-include "basic_2/dynamic/cnv.ma".
+include "basic_2/dynamic/cnv_aaa.ma".
 
 (* CONTEXT-SENSITIVE NATIVE VALIDITY FOR TERMS ******************************)
 
 (* Properties with t-bound rt-equivalence for terms *************************)
 
 lemma cnv_appl_cpes (a) (h) (G) (L):
-      ∀n. (a = Ⓣ → n ≤ 1) →
-      ∀V. ⦃G, L⦄ ⊢ V ![a, h] → ∀T. ⦃G, L⦄ ⊢ T ![a, h] →
-      ∀W. ⦃G, L⦄ ⊢ V ⬌*[h,1,0] W →
-      ∀p,U. ⦃G, L⦄ ⊢ T ➡*[n, h] ⓛ{p}W.U → ⦃G, L⦄ ⊢ ⓐV.T ![a, h].
+      ∀n. yinj n < a →
+      ∀V. ⦃G,L⦄ ⊢ V ![a,h] → ∀T. ⦃G,L⦄ ⊢ T ![a,h] →
+      ∀W. ⦃G,L⦄ ⊢ V ⬌*[h,1,0] W →
+      ∀p,U. ⦃G,L⦄ ⊢ T ➡*[n,h] ⓛ{p}W.U → ⦃G,L⦄ ⊢ ⓐV.T ![a,h].
 #a #h #G #L #n #Hn #V #HV #T #HT #W *
 /4 width=11 by cnv_appl, cpms_cprs_trans, cpms_bind/
 qed.
 
 lemma cnv_cast_cpes (a) (h) (G) (L):
-      ∀U. ⦃G, L⦄ ⊢ U ![a, h] →
-      ∀T. ⦃G, L⦄ ⊢ T ![a, h] → ⦃G, L⦄ ⊢ U ⬌*[h,0,1] T → ⦃G, L⦄ ⊢ ⓝU.T ![a, h].
+      ∀U. ⦃G,L⦄ ⊢ U ![a,h] →
+      ∀T. ⦃G,L⦄ ⊢ T ![a,h] → ⦃G,L⦄ ⊢ U ⬌*[h,0,1] T → ⦃G,L⦄ ⊢ ⓝU.T ![a,h].
 #a #h #G #L #U #HU #T #HT * /2 width=3 by cnv_cast/
 qed.
 
 (* Inversion lemmas with t-bound rt-equivalence for terms *******************)
 
 lemma cnv_inv_appl_cpes (a) (h) (G) (L):
-      ∀V,T. ⦃G, L⦄ ⊢ ⓐV.T ![a, h] →
-      ∃∃n,p,W,U. a = Ⓣ → n ≤ 1 & ⦃G, L⦄ ⊢ V ![a, h] & ⦃G, L⦄ ⊢ T ![a, h] &
-                 ⦃G, L⦄ ⊢ V ⬌*[h,1,0] W & ⦃G, L⦄ ⊢ T ➡*[n, h] ⓛ{p}W.U.
+      ∀V,T. ⦃G,L⦄ ⊢ ⓐV.T ![a,h] →
+      ∃∃n,p,W,U. yinj n < a & ⦃G,L⦄ ⊢ V ![a,h] & ⦃G,L⦄ ⊢ T ![a,h] &
+                 ⦃G,L⦄ ⊢ V ⬌*[h,1,0] W & ⦃G,L⦄ ⊢ T ➡*[n,h] ⓛ{p}W.U.
 #a #h #G #L #V #T #H
 elim (cnv_inv_appl … H) -H #n #p #W #U #Hn #HV #HT #HVW #HTU
 /3 width=7 by cpms_div, ex5_4_intro/
 qed-.
 
+lemma cnv_inv_appl_pred_cpes (a) (h) (G) (L):
+      ∀V,T. ⦃G,L⦄ ⊢ ⓐV.T ![yinj a,h] →
+      ∃∃p,W,U. ⦃G,L⦄ ⊢ V ![a,h] & ⦃G,L⦄ ⊢ T ![a,h] &
+                 ⦃G,L⦄ ⊢ V ⬌*[h,1,0] W & ⦃G,L⦄ ⊢ T ➡*[↓a,h] ⓛ{p}W.U.
+#a #h #G #L #V #T #H
+elim (cnv_inv_appl_pred … H) -H #p #W #U #HV #HT #HVW #HTU
+/3 width=7 by cpms_div, ex4_3_intro/
+qed-.
+
 lemma cnv_inv_cast_cpes (a) (h) (G) (L):
-      ∀U,T. ⦃G, L⦄ ⊢ ⓝU.T ![a, h] →
-      ∧∧ ⦃G, L⦄ ⊢ U ![a, h] & ⦃G, L⦄ ⊢ T ![a, h] & ⦃G, L⦄ ⊢ U ⬌*[h,0,1] T.
+      ∀U,T. ⦃G,L⦄ ⊢ ⓝU.T ![a,h] →
+      ∧∧ ⦃G,L⦄ ⊢ U ![a,h] & ⦃G,L⦄ ⊢ T ![a,h] & ⦃G,L⦄ ⊢ U ⬌*[h,0,1] T.
 #a #h #G #L #U #T #H
 elim (cnv_inv_cast … H) -H
 /3 width=3 by cpms_div, and3_intro/
@@ -63,7 +71,7 @@ lemma cnv_ind_cpes (a) (h) (Q:relation3 genv lenv term):
       (∀p,I,G,L,V,T. ⦃G,L⦄ ⊢ V![a,h] → ⦃G,L.ⓑ{I}V⦄⊢T![a,h] →
                      Q G L V →Q G (L.ⓑ{I}V) T →Q G L (ⓑ{p,I}V.T)
       ) →
-      (∀n,p,G,L,V,W,T,U. (a = Ⓣ → n ≤ 1) → ⦃G,L⦄ ⊢ V![a,h] → ⦃G,L⦄ ⊢ T![a,h] →
+      (∀n,p,G,L,V,W,T,U. yinj n < a → ⦃G,L⦄ ⊢ V![a,h] → ⦃G,L⦄ ⊢ T![a,h] →
                          ⦃G,L⦄ ⊢ V ⬌*[h,1,0]W → ⦃G,L⦄ ⊢ T ➡*[n,h] ⓛ{p}W.U →
                          Q G L V → Q G L T → Q G L (ⓐV.T)
       ) →