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diff --git a/helm/ocaml/tactics/introductionTactics.ml b/helm/ocaml/tactics/introductionTactics.ml
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+(* Copyright (C) 2002, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+(* $Id$ *)
+
+let fake_constructor_tac ~n (proof, goal) =
+  let module C = Cic in
+  let module R = CicReduction in
+   let (_,metasenv,_,_) = proof in
+    let metano,context,ty = CicUtil.lookup_meta goal metasenv in
+     match (R.whd context ty) with
+        (C.MutInd (uri, typeno, exp_named_subst))
+      | (C.Appl ((C.MutInd (uri, typeno, exp_named_subst))::_)) ->
+         ProofEngineTypes.apply_tactic (
+          PrimitiveTactics.apply_tac 
+           ~term: (C.MutConstruct (uri, typeno, n, exp_named_subst)))
+           (proof, goal)
+      | _ -> raise (ProofEngineTypes.Fail (lazy "Constructor: failed"))
+;;
+
+let constructor_tac ~n = ProofEngineTypes.mk_tactic (fake_constructor_tac ~n)
+
+let exists_tac  = ProofEngineTypes.mk_tactic (fake_constructor_tac ~n:1) ;;
+let split_tac = ProofEngineTypes.mk_tactic (fake_constructor_tac ~n:1) ;;
+let left_tac = ProofEngineTypes.mk_tactic (fake_constructor_tac ~n:1) ;;
+let right_tac = ProofEngineTypes.mk_tactic (fake_constructor_tac ~n:2) ;;
+