X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fstatic%2Flfdeq_fqup.ma;h=529236417e0c968c9b751477b5f4391ec2c8166d;hb=6d1c6a2cfdd1909647db5648b9cd059c61b19b40;hp=b6e2a18f68ef71da9e65ae5d6835603b0c32c034;hpb=c0a8f89161e9887c38eb5cf701f0f0c05a0e527f;p=helm.git

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 b6e2a18f6..529236417 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_fqup.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/lfdeq_fqup.ma
@@ -21,3 +21,7 @@ include "basic_2/static/lfdeq.ma".
 
 lemma lfdeq_refl: ∀h,o,T. reflexive … (lfdeq h o T).
 /2 width=1 by lfxs_refl/ qed.
+
+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.