src/CCL/gfp.thy
author paulson
Mon Dec 07 18:26:25 1998 +0100 (1998-12-07)
changeset 6019 0e55c2fb2ebb
parent 0 a5a9c433f639
permissions -rw-r--r--
tidying
     1 (*  Title: 	HOL/gfp.thy
     2     ID:         $Id$
     3     Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
     4     Copyright   1992  University of Cambridge
     5 
     6 Greatest fixed points
     7 *)
     8 
     9 Gfp = Lfp +
    10 consts gfp :: "['a set=>'a set] => 'a set"
    11 rules
    12  (*greatest fixed point*)
    13  gfp_def "gfp(f) == Union({u. u <= f(u)})"
    14 end