- the PARTIAL COMMIT continues, we issue the "reduction" component

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / reduction / cpr.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/reduction/cpr.ma b/matita/matita/contribs/lambdadelta/basic_2/reduction/cpr.ma
index bbb13d14e0b2b4e72a6460757b787a7c10d0bc0b..d2034f9d196d5f2e421b86d31102095990f4b0bb 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/reduction/cpr.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/reduction/cpr.ma
@@ -15,6 +15,7 @@
 include "basic_2/notation/relations/pred_4.ma".
 include "basic_2/grammar/genv.ma".
 include "basic_2/static/lsubr.ma".
+include "basic_2/unfold/lstas.ma".
 
 (* CONTEXT-SENSITIVE PARALLEL REDUCTION FOR TERMS ***************************)
 
@@ -52,11 +53,11 @@ lemma lsubr_cpr_trans: ∀G. lsub_trans … (cpr G) lsubr.
 #G #L1 #T1 #T2 #H elim H -G -L1 -T1 -T2
 [ //
 | #G #L1 #K1 #V1 #V2 #W2 #i #HLK1 #_ #HVW2 #IHV12 #L2 #HL12
-  elim (lsubr_fwd_ldrop2_abbr … HL12 … HLK1) -L1 *
+  elim (lsubr_fwd_drop2_abbr … HL12 … HLK1) -L1 *
   /3 width=6 by cpr_delta/
-|3,7: /4 width=1 by lsubr_bind, cpr_bind, cpr_beta/
+|3,7: /4 width=1 by lsubr_pair, cpr_bind, cpr_beta/
 |4,6: /3 width=1 by cpr_flat, cpr_eps/
-|5,8: /4 width=3 by lsubr_bind, cpr_zeta, cpr_theta/
+|5,8: /4 width=3 by lsubr_pair, cpr_zeta, cpr_theta/
 ]
 qed-.
 
@@ -87,12 +88,26 @@ lemma cpr_delift: ∀G,K,V,T1,L,d. ⇩[d] L ≡ (K.ⓓV) →
   elim (lift_split … HVW i i) /3 width=6 by cpr_delta, ex2_2_intro/
 | * [ #a ] #I #W1 #U1 #IHW1 #IHU1 #L #d #HLK
   elim (IHW1 … HLK) -IHW1 #W2 #W #HW12 #HW2
-  [ elim (IHU1 (L. ⓑ{I}W1) (d+1)) -IHU1 /3 width=9 by ldrop_drop, cpr_bind, lift_bind, ex2_2_intro/
+  [ elim (IHU1 (L. ⓑ{I}W1) (d+1)) -IHU1 /3 width=9 by drop_drop, cpr_bind, lift_bind, ex2_2_intro/
   | elim (IHU1 … HLK) -IHU1 -HLK /3 width=8 by cpr_flat, lift_flat, ex2_2_intro/
   ]
 ]
 qed-.
 
+fact lstas_cpr_aux: ∀h,G,L,T1,T2,l. ⦃G, L⦄ ⊢ T1 •*[h, l] T2 →
+                    l = 0 → ⦃G, L⦄ ⊢ T1 ➡ T2.
+#h #G #L #T1 #T2 #l #H elim H -G -L -T1 -T2 -l
+/3 width=1 by cpr_eps, cpr_flat, cpr_bind/
+[ #G #L #l #k #H0 destruct normalize //
+| #G #L #K #V1 #V2 #W2 #i #l #HLK #_ #HVW2 #IHV12 #H destruct
+  /3 width=6 by cpr_delta/
+| #G #L #K #V1 #V2 #W2 #i #l #_ #_ #_ #_ <plus_n_Sm #H destruct
+]
+qed-.
+
+lemma lstas_cpr: ∀h,G,L,T1,T2. ⦃G, L⦄ ⊢ T1 •*[h, 0] T2 → ⦃G, L⦄ ⊢ T1 ➡ T2.
+/2 width=4 by lstas_cpr_aux/ qed.
+
 (* Basic inversion lemmas ***************************************************)
 
 fact cpr_inv_atom1_aux: ∀G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡ T2 → ∀I. T1 = ⓪{I} →