src/HOL/Gfp.thy
author paulson
Thu Sep 23 13:06:31 1999 +0200 (1999-09-23)
changeset 7584 5be4bb8e4e3f
parent 3947 eb707467f8c5
child 8882 9df44a4f1bf7
permissions -rw-r--r--
tidied; added lemma restrict_to_left
     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 global
    12 
    13 constdefs
    14   gfp :: ['a set=>'a set] => 'a set
    15   "gfp(f) == Union({u. u <= f(u)})"    (*greatest fixed point*)
    16 
    17 local
    18 
    19 end