src/HOL/Gfp.thy
author nipkow
Wed Aug 18 11:09:40 2004 +0200 (2004-08-18)
changeset 15140 322485b816ac
parent 15131 c69542757a4d
child 15381 780ea4c697f2
permissions -rw-r--r--
import -> imports
     1 (*  Title:      HOL/gfp.thy
     2     ID:         $Id$
     3     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
     4     Copyright   1994  University of Cambridge
     5 
     6 Greatest fixed points (requires Lfp too!)
     7 *)
     8 
     9 theory Gfp 
    10 imports Lfp
    11 begin
    12 
    13 constdefs
    14   gfp :: "['a set=>'a set] => 'a set"
    15   "gfp(f) == Union({u. u <= f(u)})"    (*greatest fixed point*)
    16 
    17 end