update un delayed_updating

[helm.git] / matita / matita / contribs / lambdadelta / delayed_updating / substitution / lift.ma

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift.ma b/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift.ma
index fa63286846e697621e2ac313b739825204abc2a5..3a6991a92d686797e9862700bbaea455e8e5230f 100644 (file)
--- a/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift.ma
@@ -109,6 +109,10 @@ lemma lift_path_m_sn (f) (p):
 
 (* Basic constructions with proj_rmap ***************************************)
 
+lemma lift_rmap_empty (f):
+      f = ↑[𝐞]f.
+// qed.
+
 lemma lift_rmap_d_sn (f) (p) (n):
       ↑[p](f∘𝐮❨ninj n❩) = ↑[𝗱n◗p]f.
 #f * // qed.