X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground_2%2Flib%2Frelations.ma;h=af10dbb890adc5bd13070a6f4e024c4f15f0a912;hb=54c4e854515cbcb1376881e9aedad006bf6545f2;hp=86be386408dbf8856a3c91e8a9956f7311bbee75;hpb=397413c4196f84c81d61ba7dd79b54ab1c428ebb;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/ground_2/lib/relations.ma b/matita/matita/contribs/lambdadelta/ground_2/lib/relations.ma
index 86be38640..af10dbb89 100644
--- a/matita/matita/contribs/lambdadelta/ground_2/lib/relations.ma
+++ b/matita/matita/contribs/lambdadelta/ground_2/lib/relations.ma
@@ -13,10 +13,13 @@
 (**************************************************************************)
 
 include "basics/relations.ma".
-include "ground_2/xoa/xoa_props.ma".
+include "ground_2/lib/logic.ma".
 
 (* GENERIC RELATIONS ********************************************************)
 
+lemma insert_eq: ∀A,a. ∀Q1,Q2:predicate A. (∀a0. Q1 a0 → a = a0 → Q2 a0) → Q1 a → Q2 a.
+/2 width=1 by/ qed-.
+
 (* Inclusion ****************************************************************)
 
 definition subR2 (S1) (S2): relation (relation2 S1 S2) ≝