--- /dev/null
+(* Copyright (C) 2000, 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/.
+ *)
+
+exception UnificationFailure of string Lazy.t;;
+exception Uncertain of string Lazy.t;;
+exception AssertFailure of string Lazy.t;;
+
+(* fo_unif metasenv context t1 t2 *)
+(* unifies [t1] and [t2] in a context [context]. *)
+(* Only the metavariables declared in [metasenv] *)
+(* can be used in [t1] and [t2]. *)
+(* The returned substitution can be directly *)
+(* withouth first unwinding it. *)
+val fo_unif :
+ Cic.metasenv -> Cic.context ->
+ Cic.term -> Cic.term -> CicUniv.universe_graph ->
+ Cic.substitution * Cic.metasenv * CicUniv.universe_graph
+
+(* fo_unif_subst metasenv subst context t1 t2 *)
+(* unifies [t1] and [t2] in a context [context] *)
+(* and with [subst] as the current substitution *)
+(* (i.e. unifies ([subst] [t1]) and *)
+(* ([subst] [t2]) in a context *)
+(* ([subst] [context]) using the metasenv *)
+(* ([subst] [metasenv]) *)
+(* Only the metavariables declared in [metasenv] *)
+(* can be used in [t1] and [t2]. *)
+(* [subst] and the substitution returned are not *)
+(* unwinded. *)
+(*CSC: fare un tipo unione Unwinded o ToUnwind e fare gestire la
+ cosa all'apply_subst!!!*)
+val fo_unif_subst :
+ Cic.substitution -> Cic.context -> Cic.metasenv ->
+ Cic.term -> Cic.term -> CicUniv.universe_graph ->
+ Cic.substitution * Cic.metasenv * CicUniv.universe_graph
+