- exclusion binder in local environments allows to complete lfsx_lfsx !

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / rt_transition / lfpx_lfdeq.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpx_lfdeq.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpx_lfdeq.ma
index 414bfddd4043f18c280c069c3621d01356c17cb5..3e77508453a306a50183d88c7942295145b98730 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpx_lfdeq.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpx_lfdeq.ma
@@ -22,18 +22,22 @@ include "basic_2/rt_transition/lfpx.ma". (**) (* should be in lfpx_frees.ma *)
 
 (* Properties with degree-based equivalence for local environments **********)
 
-lemma lfpx_pair_sn_split: ∀h,o,I,G,L1,L2,V,T. ⦃G, L1⦄ ⊢ ⬈[h, V] L2 →
+lemma lfpx_pair_sn_split: ∀h,G,L1,L2,V. ⦃G, L1⦄ ⊢ ⬈[h, V] L2 → ∀o,I,T.
                           ∃∃L. ⦃G, L1⦄ ⊢ ⬈[h, ②{I}V.T] L & L ≡[h, o, V] L2.
 /3 width=5 by lfpx_frees_conf, lfxs_pair_sn_split/ qed-.
 
-lemma lfpx_flat_dx_split: ∀h,o,I,G,L1,L2,V,T. ⦃G, L1⦄ ⊢ ⬈[h, T] L2 →
+lemma lfpx_flat_dx_split: ∀h,G,L1,L2,T. ⦃G, L1⦄ ⊢ ⬈[h, T] L2 → ∀o,I,V.
                           ∃∃L. ⦃G, L1⦄ ⊢ ⬈[h, ⓕ{I}V.T] L & L ≡[h, o, T] L2.
 /3 width=5 by lfpx_frees_conf, lfxs_flat_dx_split/ qed-.
 
-lemma lfpx_bind_dx_split: ∀h,o,p,I,G,L1,L2,V1,T. ⦃G, L1.ⓑ{I}V1⦄ ⊢ ⬈[h, T] L2 →
+lemma lfpx_bind_dx_split: ∀h,I,G,L1,L2,V1,T. ⦃G, L1.ⓑ{I}V1⦄ ⊢ ⬈[h, T] L2 → ∀o,p.
                           ∃∃L,V. ⦃G, L1⦄ ⊢ ⬈[h, ⓑ{p,I}V1.T] L & L.ⓑ{I}V ≡[h, o, T] L2 & ⦃G, L1⦄ ⊢ V1 ⬈[h] V.
 /3 width=5 by lfpx_frees_conf, lfxs_bind_dx_split/ qed-.
 
+lemma lfpx_bind_dx_split_void: ∀h,G,K1,L2,T. ⦃G, K1.ⓧ⦄ ⊢ ⬈[h, T] L2 → ∀o,p,I,V.
+                               ∃∃K2. ⦃G, K1⦄ ⊢ ⬈[h, ⓑ{p,I}V.T] K2 & K2.ⓧ ≡[h, o, T] L2.
+/3 width=5 by lfpx_frees_conf, lfxs_bind_dx_split_void/ qed-.
+
 lemma cpx_tdeq_conf_lexs: ∀h,o,G. R_confluent2_lfxs … (cpx h G) (cdeq h o) (cpx h G) (cdeq h o).
 #h #o #G #L0 #T0 #T1 #H @(cpx_ind … H) -G -L0 -T0 -T1 /2 width=3 by ex2_intro/
 [ #G #L0 #s0 #X0 #H0 #L1 #HL01 #L2 #HL02