more lemmas to prove and a correction in subst

[helm.git] / matita / matita / lib / lambda-delta / substitution / lift.ma

diff --git a/matita/matita/lib/lambda-delta/substitution/lift.ma b/matita/matita/lib/lambda-delta/substitution/lift.ma
index acd84df08b05038921a2a7e9f7c27e5743157285..60b1b62e74481cbe2876661f8ac448bd59423995 100644 (file)
--- a/matita/matita/lib/lambda-delta/substitution/lift.ma
+++ b/matita/matita/lib/lambda-delta/substitution/lift.ma
@@ -169,6 +169,8 @@ qed.
 
 (* the main properies *******************************************************)
 
+axiom lift_total: ∀d,e,T1. ∃T2. ↑[d,e] T1 ≡ T2.
+
 axiom lift_mono:  ∀d,e,T,U1. ↑[d,e] T ≡ U1 → ∀U2. ↑[d,e] T ≡ U2 → U1 = U2.
 
 theorem lift_conf_rev: ∀d1,e1,T1,T. ↑[d1,e1] T1 ≡ T →