X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_computation%2Fcprs.ma;h=ff8271ebda2a482c36b7ed9734a64c6444c9bf3d;hb=5c92c318030a05c766b3f6070dbd23589cbdee04;hp=36d7644e69f0d8afdbf256c0e9b598c3a6779cbc;hpb=2f20aaf586f7cb4fd2933d765f4d09fcf077e4c5;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs.ma
index 36d7644e6..ff8271ebd 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs.ma
@@ -20,11 +20,11 @@ include "basic_2/rt_computation/cpms.ma".
 (* Basic eliminators ********************************************************)
 
 (* Basic_2A1: was: cprs_ind_dx *)
-lemma cprs_ind_sn (h) (G) (L) (T2) (R:predicate …):
-                  R T2 →
-                  (∀T1,T. ⦃G, L⦄ ⊢ T1 ➡[h] T → ⦃G, L⦄ ⊢ T ➡*[h] T2 → R T → R T1) →
-                  ∀T1. ⦃G, L⦄ ⊢ T1 ➡*[h] T2 → R T1.
-#h #G #L #T2 #R #IH1 #IH2 #T1
+lemma cprs_ind_sn (h) (G) (L) (T2) (Q:predicate …):
+                  Q T2 →
+                  (∀T1,T. ⦃G, L⦄ ⊢ T1 ➡[h] T → ⦃G, L⦄ ⊢ T ➡*[h] T2 → Q T → Q T1) →
+                  ∀T1. ⦃G, L⦄ ⊢ T1 ➡*[h] T2 → Q T1.
+#h #G #L #T2 #Q #IH1 #IH2 #T1
 @(insert_eq_0 … 0) #n #H
 @(cpms_ind_sn … H) -n -T1 //
 #n1 #n2 #T1 #T #HT1 #HT2 #IH #H
@@ -33,11 +33,11 @@ elim (plus_inv_O3 n1 n2) // -H #H1 #H2 destruct
 qed-.
 
 (* Basic_2A1: was: cprs_ind *)
-lemma cprs_ind_dx (h) (G) (L) (T1) (R:predicate …):
-                  R T1 →
-                  (∀T,T2. ⦃G, L⦄ ⊢ T1 ➡*[h] T → ⦃G, L⦄ ⊢ T ➡[h] T2 → R T → R T2) →
-                  ∀T2. ⦃G, L⦄ ⊢ T1 ➡*[h] T2 → R T2.
-#h #G #L #T1 #R #IH1 #IH2 #T2
+lemma cprs_ind_dx (h) (G) (L) (T1) (Q:predicate …):
+                  Q T1 →
+                  (∀T,T2. ⦃G, L⦄ ⊢ T1 ➡*[h] T → ⦃G, L⦄ ⊢ T ➡[h] T2 → Q T → Q T2) →
+                  ∀T2. ⦃G, L⦄ ⊢ T1 ➡*[h] T2 → Q T2.
+#h #G #L #T1 #Q #IH1 #IH2 #T2
 @(insert_eq_0 … 0) #n #H
 @(cpms_ind_dx … H) -n -T2 //
 #n1 #n2 #T #T2 #HT1 #IH #HT2 #H
@@ -84,15 +84,13 @@ lemma cprs_inv_sort1 (h) (G) (L): ∀X2,s. ⦃G, L⦄ ⊢ ⋆s ➡*[h] X2 → X2
 
 (* Basic_1: was: pr3_gen_cast *)
 lemma cprs_inv_cast1 (h) (G) (L): ∀W1,T1,X2. ⦃G, L⦄ ⊢ ⓝW1.T1 ➡*[h] X2 →
-                                  ∨∨ ⦃G, L⦄ ⊢ T1 ➡*[h] X2
-                                   | ∃∃W2,T2. ⦃G, L⦄ ⊢ W1 ➡*[h] W2 & ⦃G, L⦄ ⊢ T1 ➡*[h] T2 & X2 = ⓝW2.T2.
-#h #G #L #W1 #T1 #X2 #H @(cprs_ind_dx … H) -X2
-[ /3 width=5 by ex3_2_intro, or_intror/
-| #X #X2 #_ #HX2 * /3 width=3 by cprs_step_dx, or_introl/ *
-  #W #T #HW1 #HT1 #H destruct
-  elim (cpr_inv_cast1 … HX2) -HX2 /3 width=3 by cprs_step_dx, or_introl/ *
-  #W2 #T2 #HW2 #HT2 #H destruct
-  /4 width=5 by cprs_step_dx, ex3_2_intro, or_intror/
+                                  ∨∨ ∃∃W2,T2. ⦃G, L⦄ ⊢ W1 ➡*[h] W2 & ⦃G, L⦄ ⊢ T1 ➡*[h] T2 & X2 = ⓝW2.T2
+                                   | ⦃G, L⦄ ⊢ T1 ➡*[h] X2.
+#h #G #L #W1 #T1 #X2 #H
+elim (cpms_inv_cast1 … H) -H
+[ /2 width=1 by or_introl/
+| /2 width=1 by or_intror/
+| * #m #_ #H destruct
 ]
 qed-.