X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fstatic%2Flfdeq_length.ma;h=06fa93f19f9f5a060a779e24d7873b12b0f70a9f;hb=47a745462a714af9d65cea7b61af56524bd98fa1;hp=aafc792212195f92d80d600f689478cc581976fd;hpb=58ea181757dce19b875b2f5a224fe193b2263004;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_length.ma b/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_length.ma
index aafc79221..06fa93f19 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_length.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_length.ma
@@ -12,13 +12,33 @@
 (*                                                                        *)
 (**************************************************************************)
 
+include "basic_2/relocation/lifts_tdeq.ma".
 include "basic_2/static/lfxs_length.ma".
+include "basic_2/static/lfxs_fsle.ma".
 include "basic_2/static/lfdeq.ma".
 
 (* DEGREE-BASED EQUIVALENCE FOR LOCAL ENVIRONMENTS ON REFERRED ENTRIES ******)
 
+(* Advanved properties with free variables inclusion ************************)
+
+lemma lfdeq_fsle_comp: ∀h,o. lfxs_fsle_compatible (cdeq h o).
+#h #o #L1 #L2 #T * #f1 #Hf1 #HL12
+lapply (frees_lfdeq_conf h o … Hf1 … HL12)
+lapply (lexs_fwd_length … HL12)
+/3 width=8 by lveq_length_eq, ex4_4_intro/ (**) (* full auto fails *)
+qed-.
+
+(* Properties with length for local environments ****************************)
+
+(* Basic_2A1: uses: lleq_lift_le lleq_lift_ge *)
+lemma lfdeq_lifts_bi: ∀L1,L2. |L1| = |L2| → ∀h,o,K1,K2,T. K1 ≛[h, o, T] K2 →
+                      ∀b,f. ⬇*[b, f] L1 ≡ K1 → ⬇*[b, f] L2 ≡ K2 →
+                      ∀U. ⬆*[f] T ≡ U → L1 ≛[h, o, U] L2.
+/3 width=9 by lfxs_lifts_bi, tdeq_lifts_sn/ qed-.
+
 (* Forward lemmas with length for local environments ************************)
 
 (* Basic_2A1: lleq_fwd_length *)
-lemma lfdeq_fwd_length: ∀h,o,L1,L2. ∀T:term. L1 ≡[h, o, T] L2 → |L1| = |L2|.
+lemma lfdeq_fwd_length: ∀h,o,L1,L2. ∀T:term. L1 ≛[h, o, T] L2 → |L1| = |L2|.
 /2 width=3 by lfxs_fwd_length/ qed-.
+