- nat.ma: we added a general induction principle

[helm.git] / matita / matita / contribs / lambda / xoa.conf.xml

diff --git a/matita/matita/contribs/lambda/xoa.conf.xml b/matita/matita/contribs/lambda/xoa.conf.xml
index 620113e796d26764948b7f611705ee57fc83172f..1343a2c1e89d9cfd9a5527ed0855b3da2c1b9bd0 100644 (file)
--- a/matita/matita/contribs/lambda/xoa.conf.xml
+++ b/matita/matita/contribs/lambda/xoa.conf.xml
@@ -10,6 +10,7 @@
     <key name="include">basics/pts.ma</key>
     <key name="ex">2 1</key>
     <key name="ex">3 2</key>
+    <key name="ex">4 3</key>
     <key name="or">3</key>
   </section>
 </helm_registry>