src/HOL/Gfp.thy
author nipkow
Tue Apr 08 10:48:42 1997 +0200 (1997-04-08)
changeset 2919 953a47dc0519
parent 1558 9c6ebfab4e05
child 3947 eb707467f8c5
permissions -rw-r--r--
Dep. on Provers/nat_transitive
     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 Gfp = Lfp +
    10 
    11 constdefs
    12   gfp :: ['a set=>'a set] => 'a set
    13   "gfp(f) == Union({u. u <= f(u)})"    (*greatest fixed point*)
    14 
    15 end