X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fcomputation%2Fcpxs_lleq.ma;h=7a566659321049be124f35c36e2e3775cfeeabf5;hb=0733a61e7b3a0f6173b403e3bfc2257b725b44f2;hp=6c5b811eb752600465ac755c479d7895c60a3da1;hpb=58ee2c0f9c6f6b1f2db58509d6d971d62cfd962a;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/computation/cpxs_lleq.ma b/matita/matita/contribs/lambdadelta/basic_2/computation/cpxs_lleq.ma
index 6c5b811eb..7a5666593 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/computation/cpxs_lleq.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/computation/cpxs_lleq.ma
@@ -29,3 +29,7 @@ lemma lleq_cpxs_conf_dx: ∀h,g,G,L2,T1,T2. ⦃G, L2⦄ ⊢ T1 ➡*[h, g] T2 →
                          ∀L1. L1 ⋕[T1, 0] L2 → L1 ⋕[T2, 0] L2.
 #h #g #G #L2 #T1 #T2 #H @(cpxs_ind … H) -T2 /3 width=6 by lleq_cpx_conf_dx/
 qed-.
+
+lemma lleq_cpxs_conf_sn: ∀h,g,G,L1,T1,T2. ⦃G, L1⦄ ⊢ T1 ➡*[h, g] T2 →
+                         ∀L2. L1 ⋕[T1, 0] L2 → L1 ⋕[T2, 0] L2.
+/4 width=6 by lleq_cpxs_conf_dx, lleq_sym/ qed-.