X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fdelayed_updating%2Fsyntax%2Fpath_proper.ma;fp=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fdelayed_updating%2Fsyntax%2Fpath_proper.ma;h=ff6a53c3932c4a01eac32c3e58993ab8fadb9174;hb=00fca351072c2dba11b71c14b1169d303fd6836f;hp=9cab60b87950a5c132f82f4bbf1361a723d5e61c;hpb=6f1b6f85a78d4c8da42f035f433fe4b85962bd9b;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_proper.ma b/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_proper.ma
index 9cab60b87..ff6a53c39 100644
--- a/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_proper.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_proper.ma
@@ -30,7 +30,12 @@ interpretation
 (* Basic constructions ******************************************************)
 
 lemma ppc_lcons (l) (q): l◗q ϵ 𝐏.
-#l #p #H destruct
+#l #q #H0 destruct
+qed.
+
+lemma ppc_rcons (l) (q): q◖l ϵ 𝐏.
+#l #q #H
+elim (eq_inv_list_empty_rcons ??? H)
 qed.
 
 (* Basic inversions ********************************************************)