- exclusion binder added in local environments

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / static / lfdeq_fqup.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_fqup.ma b/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_fqup.ma
index b20b5a0bfeb11529d049a1052e1fda74260165c8..30bef569bf128ca83f4d5d3528ac255e41f722d5 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_fqup.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_fqup.ma
@@ -26,3 +26,15 @@ lemma lfdeq_refl: ∀h,o,T. reflexive … (lfdeq h o T).
 lemma lfdeq_pair: ∀h,o,V1,V2. V1 ≡[h, o] V2 →
                   ∀I,L. ∀T:term. L.ⓑ{I}V1 ≡[h, o, T] L.ⓑ{I}V2.
 /2 width=1 by lfxs_pair/ qed.
+
+(* Advanced inversion lemmas ************************************************)
+
+lemma lfdeq_inv_bind_void: ∀h,o,p,I,L1,L2,V,T. L1 ≡[h, o, ⓑ{p,I}V.T] L2 →
+                           L1 ≡[h, o, V] L2 ∧ L1.ⓧ ≡[h, o, T] L2.ⓧ.
+/2 width=3 by lfxs_inv_bind_void/ qed-.
+
+(* Advanced forward lemmas **************************************************)
+
+lemma lfdeq_fwd_bind_dx_void: ∀h,o,p,I,L1,L2,V,T.
+                              L1 ≡[h, o, ⓑ{p,I}V.T] L2 → L1.ⓧ ≡[h, o, T] L2.ⓧ.
+/2 width=4 by lfxs_fwd_bind_dx_void/ qed-.