X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambda_delta%2Fground_2%2Fxoa_props.ma;h=71216d1c4dee1cc0795580468c082e67dfb47473;hb=53f874fba5b9c39a788085515a4fefe5d29281da;hp=121eb7e741cdb2f4d37bd5d1b73dd80ed8166730;hpb=eb918fc784eacd2094e3986ba321ef47690d9983;p=helm.git

diff --git a/matita/matita/contribs/lambda_delta/ground_2/xoa_props.ma b/matita/matita/contribs/lambda_delta/ground_2/xoa_props.ma
index 121eb7e74..71216d1c4 100644
--- a/matita/matita/contribs/lambda_delta/ground_2/xoa_props.ma
+++ b/matita/matita/contribs/lambda_delta/ground_2/xoa_props.ma
@@ -12,8 +12,13 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "Ground_2/xoa_notation.ma".
-include "Ground_2/xoa.ma".
+include "basics/logic.ma".
+include "ground_2/xoa_notation.ma".
+include "ground_2/xoa.ma".
+
+interpretation "logical false" 'false = False.
+
+interpretation "logical true" 'true = True.
 
 lemma ex2_1_comm: ∀A0. ∀P0,P1:A0→Prop. (∃∃x0. P0 x0 & P1 x0) → ∃∃x0. P1 x0 & P0 x0.
 #A0 #P0 #P1 * /2 width=3/