(* Binary relations, headers.
   Copyright (C) 2003 Jean Goubault-Larrecq and LSV, CNRS UMR 8643 & ENS Cachan.

   This file is part of h1.

   h1 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, or (at your option)
   any later version.

   h1 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 h1; see the file COPYING.  If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*)

extern val invrel : (''a -m> ''b) -> (''b -m> ''a set);
extern val inv_rel : (''a -m> ''b set) -> (''b -m> ''a set);
infix 6 Urel;
extern val op Urel : (''a -m> ''b set) * (''a -m> ''b set) -> (''a -m> ''b set);
extern val union_rel : (''a -m> ''b set) set -> (''a -m> ''b set);
extern val diff_rel : (''a -m> ''b set) * (''a -m> ''b set) -> (''a -m> ''b set);
extern val comp_rel : (''b -m> ''c set) * (''a -m> ''b set) -> (''a -m> ''c set);
extern val transitive_closure : (''a -m> ''a set) -> (''a -m> ''a set);
