- transcript: bugfix

[helm.git] / helm / software / matita / library / didactic / support / natural_deduction.ma

diff --git a/helm/software/matita/library/didactic/support/natural_deduction.ma b/helm/software/matita/library/didactic/support/natural_deduction.ma
index c592b5254a3df4469f5af82c49e1fb9b0f6c6276..c6bd96df159302c658412e1786f7d9ffed6f6159 100644 (file)
--- a/helm/software/matita/library/didactic/support/natural_deduction.ma
+++ b/helm/software/matita/library/didactic/support/natural_deduction.ma
@@ -1,3 +1,17 @@
+(**************************************************************************)
+(*       ___                                                             *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||       A.Asperti, C.Sacerdoti Coen,                          *)
+(*      ||A||       E.Tassi, S.Zacchiroli                                 *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU Lesser General Public License Version 2.1         *)
+(*                                                                        *)
+(**************************************************************************)
+
 (* Logic system *)
 
 inductive Imply (A,B:CProp) : CProp ≝