X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frelocation%2Flreq.ma;h=20541fef7a65224e215d644891261795d27d02e4;hb=ebc170efe71cf4ee842acfbe58bb6864e76ba98c;hp=58914d3a613ce3db85c6d646ceeb551faceacb3b;hpb=72e835f5e6848c09faf6343fb7e276c88bfc1f2e;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/relocation/lreq.ma b/matita/matita/contribs/lambdadelta/basic_2/relocation/lreq.ma
index 58914d3a6..20541fef7 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/relocation/lreq.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/relocation/lreq.ma
@@ -91,6 +91,9 @@ lemma lreq_inv_push: ∀I1,I2,L1,L2,V1,V2,f.
 #I1 #I2 #L1 #L2 #V1 #V2 #f #H elim (lexs_inv_push … H) -H /2 width=1 by conj/
 qed-.
 
+lemma lreq_inv_tl: ∀I,L1,L2,V,f. L1 ≡[⫱f] L2 → L1.ⓑ{I}V ≡[f] L2.ⓑ{I}V.
+/2 width=1 by lexs_inv_tl/ qed-.
+
 (* Basic_2A1: removed theorems 5:
               lreq_pair_lt lreq_succ_lt lreq_pair_O_Y lreq_O2 lreq_inv_O_Y
 *)