- more commutations with superclosure: fpb_lfdeq

[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 b6e2a18f68ef71da9e65ae5d6835603b0c32c034..529236417e0c968c9b751477b5f4391ec2c8166d 100644 (file)
--- 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.