+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||M|| *)
-(* ||A|| A project by Andrea Asperti *)
-(* ||T|| *)
-(* ||I|| Developers: *)
-(* ||T|| The HELM team. *)
-(* ||A|| http://helm.cs.unibo.it *)
-(* \ / *)
-(* \ / This file is distributed under the terms of the *)
-(* v GNU General Public License Version 2 *)
-(* *)
-(**************************************************************************)
-
-include "basic_2/syntax/ext2.ma".
-
-(* EXTENSION TO BINDERS OF A RELATION FOR TERMS *****************************)
-
-(* Main properties **********************************************************)
-
-theorem ext2_trans: ∀R. Transitive … R → Transitive … (ext2 R).
-#R #HR #I1 #I #H elim H -I1 -I
-[ #I1 #J #H >(ext2_inv_unit_sn … H) -J /2 width=1 by ext2_unit/
-| #I1 #V1 #V #HV1 #J #H elim (ext2_inv_pair_sn … H) -H
- #V2 #HV2 #H destruct /3 width=3 by ext2_pair/
-]
-qed-.