From 8653dd54c57943e28e3ef60d2d0cbc1861a76a33 Mon Sep 17 00:00:00 2001
From: Ferruccio Guidi <ferruccio.guidi@unibo.it>
Date: Sat, 6 Jan 2018 16:31:41 +0100
Subject: [PATCH] update in ground_2 + \lambda\delta-related ignores

---
 .gitignore                                                  | 2 ++
 .../matita/contribs/lambdadelta/ground_2/xoa/xoa_props.ma   | 6 ++++++
 matita/matita/contribs/lambdadelta/ground_2/xoa2.conf.xml   | 1 +
 3 files changed, 9 insertions(+)

diff --git a/.gitignore b/.gitignore
index af77f87fa..a433c4179 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,3 +38,5 @@ matita/matita/contribs/lambdadelta/token
 matita/matita/contribs/lambdadelta/2A1
 matita/matita/contribs/lambdadelta/apps_2/notation
 matita/matita/contribs/lambdadelta/apps_2/models
+matita/matita/contribs/lambdadelta/ground_2/xoa/xoa2.ma
+matita/matita/contribs/lambdadelta/ground_2/notation/xoa/notation2.ma
diff --git a/matita/matita/contribs/lambdadelta/ground_2/xoa/xoa_props.ma b/matita/matita/contribs/lambdadelta/ground_2/xoa/xoa_props.ma
index 408e1933d..530c0e2b3 100644
--- a/matita/matita/contribs/lambdadelta/ground_2/xoa/xoa_props.ma
+++ b/matita/matita/contribs/lambdadelta/ground_2/xoa/xoa_props.ma
@@ -22,3 +22,9 @@ include "ground_2/xoa/xoa.ma".
 interpretation "logical false" 'false = False.
 
 interpretation "logical true" 'true = True.
+
+(* Logical properties missing in the basic library **************************) 
+
+lemma commutative_and: ∀A,B. A ∧ B → B ∧ A.
+#A #B * /2 width=1 by conj/
+qed-.
diff --git a/matita/matita/contribs/lambdadelta/ground_2/xoa2.conf.xml b/matita/matita/contribs/lambdadelta/ground_2/xoa2.conf.xml
index 593d91873..27e070903 100644
--- a/matita/matita/contribs/lambdadelta/ground_2/xoa2.conf.xml
+++ b/matita/matita/contribs/lambdadelta/ground_2/xoa2.conf.xml
@@ -5,5 +5,6 @@
     <key name="objects">ground_2/xoa/xoa2</key>
     <key name="notations">ground_2/notation/xoa/notation2</key>
     <key name="include">basics/pts.ma</key>
+    <key name="ex">3 6</key>
   </section>
 </helm_registry>
-- 
2.39.2