- predefined_virtuals: some additions

[helm.git] / matita / matita / contribs / lambda_delta / basic_2 / reducibility / lcpr_cpr.ma

diff --git a/matita/matita/contribs/lambda_delta/basic_2/reducibility/lcpr_cpr.ma b/matita/matita/contribs/lambda_delta/basic_2/reducibility/lcpr_cpr.ma
index 08f63e87f88c5284632dcbc57c5b5d994481e04d..69edad2aa15744087754bea50db6cd7528bb8988 100644 (file)
--- a/matita/matita/contribs/lambda_delta/basic_2/reducibility/lcpr_cpr.ma
+++ b/matita/matita/contribs/lambda_delta/basic_2/reducibility/lcpr_cpr.ma
@@ -25,3 +25,7 @@ lemma lcpr_pair: ∀L1,L2. L1 ⊢ ➡ L2 → ∀V1,V2. L2 ⊢ V1 ➡ V2 →
 #L1 #L2 * #L #HL1 #HL2 #V1 #V2 *
 <(ltpss_fwd_length … HL2) /4 width=5/
 qed.
+
+lemma ltpss_lcpr: ∀L1,L2,d,e. L1 ▶* [d, e] L2 → L1 ⊢ ➡ L2.
+#L1 #L2 #d #e #H elim H -L1 -L2 -d -e // /3 width=3/
+qed.