main part of lfpxs_cpxs ...

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

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpr_fqup.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpr_fqup.ma
index 297993014526aebe12763295b46d5831f426bfc6..d0be9086965e161c9f1fd576ced2103049b8d959 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpr_fqup.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/lfpr_fqup.ma
@@ -22,3 +22,7 @@ include "basic_2/rt_transition/lfpr.ma".
 (* Note: lemma 250 *)
 lemma lfpr_refl: ∀h,G,T. reflexive … (lfpr h G T).
 /2 width=1 by lfxs_refl/ qed.
+
+lemma lfpr_pair: ∀h,G,L,V1,V2. ⦃G, L⦄ ⊢ V1 ➡[h] V2 →
+                 ∀I,T. ⦃G, L.ⓑ{I}V1⦄ ⊢ ➡[h, T] L.ⓑ{I}V2.
+/2 width=1 by lfxs_pair/ qed.