X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fdynamic%2Fnta_preserve.ma;h=ebc6fd96db1b50b6f73aba63dcd70f8da0c7f37d;hb=f308429a0fde273605a2330efc63268b4ac36c99;hp=daf753fb366872d53b58eee1c8769676f5554780;hpb=a0b7db9844126ebcdf4b5dbb586514854cef5d93;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/nta_preserve.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/nta_preserve.ma
index daf753fb3..ebc6fd96d 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/nta_preserve.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/nta_preserve.ma
@@ -51,9 +51,8 @@ elim (cnv_inv_appl … H2) #n #p #X1 #X2 #_ #HV #_ #HVX1 #HUX2
 elim (cnv_cpms_conf … HU … HUX0 … HUX2) -HU -HUX2
 <minus_O_n <minus_n_O #X #HX0 #H
 elim (cpms_inv_abst_sn … H) -H #X3 #X4 #HX13 #HX24 #H destruct
-@(cnv_cast … (ⓐV.X0)) [2:|*: /2 width=1 by cpms_appl_dx/ ]
-@(cnv_appl … X3) [4: |*: /2 width=7 by cpms_trans, cpms_cprs_trans/ ]
-#H destruct
+@(cnv_cast … (ⓐV.X0)) [2:|*: /2 width=1 by cpms_appl_dx/ ] (**) (* full auto a bit slow *)
+/3 width=10 by cnv_appl, cpms_trans, cpms_cprs_trans/
 qed.
 
 (* Basic_1: uses: ty3_sred_wcpr0_pr0 *)
@@ -126,7 +125,7 @@ elim (cpms_inv_lref_sn … H2) -H2 *
 qed-.
 
 lemma nta_inv_lref_sn_drops_cnv (a) (h) (G) (L): 
-      ∀X2, i. ⦃G,L⦄ ⊢ #i :[a,h] X2 →
+      ∀X2,i. ⦃G,L⦄ ⊢ #i :[a,h] X2 →
       ∨∨ ∃∃K,V,W,U. ⬇*[i] L ≘ K.ⓓV & ⦃G,K⦄ ⊢ V :[a,h] W & ⬆*[↑i] W ≘ U & ⦃G,L⦄ ⊢ U ⬌*[h] X2 & ⦃G,L⦄ ⊢ X2 ![a,h]
        | ∃∃K,W,U. ⬇*[i] L ≘ K. ⓛW & ⦃G,K⦄ ⊢ W ![a,h] & ⬆*[↑i] W ≘ U & ⦃G,L⦄ ⊢ U ⬌*[h] X2 & ⦃G,L⦄ ⊢ X2 ![a,h].
 #a #h #G #L #X2 #i #H
@@ -169,7 +168,7 @@ lemma nta_inv_appl_sn (h) (G) (L) (X2):
       ∃∃p,W,U. ⦃G,L⦄ ⊢ V :[h] W & ⦃G,L⦄ ⊢ T :[h] ⓛ{p}W.U & ⦃G,L⦄ ⊢ ⓐV.ⓛ{p}W.U ⬌*[h] X2 & ⦃G,L⦄ ⊢ X2 ![h].
 #h #G #L #X2 #V #T #H
 elim (cnv_inv_cast … H) -H #X #HX2 #H1 #HX2 #H2
-elim (cnv_inv_appl_true … H1) #p #W #U #HV #HT #HVW #HTU
+elim (cnv_inv_appl_pred … H1) #p #W #U #HV #HT #HVW #HTU
 /5 width=11 by cnv_cpms_nta, cnv_cpms_conf_eq, cpcs_cprs_div, cpms_appl_dx, ex4_3_intro/
 qed-.
 
@@ -242,7 +241,7 @@ elim (cpms_inv_cast1 … H2) -H2 [ * || * ]
 qed-.
 
 (* Basic_1: uses: ty3_gen_lift *)
-(* Note: "⦃G,L⦄ ⊢ U2 ⬌*[h] X2" can be "⦃G,L⦄ ⊢ X2 ➡*[h] U2" *)
+(* Note: "⦃G, L⦄ ⊢ U2 ⬌*[h] X2" can be "⦃G, L⦄ ⊢ X2 ➡*[h] U2" *)
 lemma nta_inv_lifts_sn (a) (h) (G):
       ∀L,T2,X2. ⦃G,L⦄ ⊢ T2 :[a,h] X2 →
       ∀b,f,K. ⬇*[b,f] L ≘ K → ∀T1. ⬆*[f] T1 ≘ T2 →