X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fi_static%2Ftc_lfxs.ma;h=90b0de1eb649fc618778637ded5582e583777f64;hp=8e3bf8a4d32973c5308eccccb30b6c95d528cab8;hb=9323611e3819c1382b872a7ada00264991f36217;hpb=b0eb62e60a2fd73ba39c7a0df112f04131528602

diff --git a/matita/matita/contribs/lambdadelta/basic_2/i_static/tc_lfxs.ma b/matita/matita/contribs/lambdadelta/basic_2/i_static/tc_lfxs.ma
index 8e3bf8a4d..90b0de1eb 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/i_static/tc_lfxs.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/i_static/tc_lfxs.ma
@@ -67,13 +67,6 @@ lemma tc_lfxs_gref: ∀R,I,L1,L2,V1,V2,l.
 /3 width=4 by lfxs_gref, tc_lfxs_step_dx, inj/
 qed.
 
-lemma tc_lfxs_sym: ∀R. lexs_frees_confluent (cext2 R) cfull →
-                   (∀L1,L2,T1,T2. R L1 T1 T2 → R L2 T2 T1) →
-                   ∀T. symmetric … (tc_lfxs R T).
-#R #H1R #H2R #T #L1 #L2 #H elim H -L2
-/4 width=3 by lfxs_sym, tc_lfxs_step_sn, inj/
-qed-.
-
 lemma tc_lfxs_co: ∀R1,R2. (∀L,T1,T2. R1 L T1 T2 → R2 L T1 T2) →
                   ∀L1,L2,T. L1 ⪤**[R1, T] L2 → L1 ⪤**[R2, T] L2.
 #R1 #R2 #HR #L1 #L2 #T #H elim H -L2