src/HOL/Gfp.thy
changeset 923 ff1574a81019
child 1370 7361ac9b024d
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/HOL/Gfp.thy	Fri Mar 03 12:02:25 1995 +0100
     1.3 @@ -0,0 +1,14 @@
     1.4 +(*  Title: 	HOL/gfp.thy
     1.5 +    ID:         $Id$
     1.6 +    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
     1.7 +    Copyright   1994  University of Cambridge
     1.8 +
     1.9 +Greatest fixed points (requires Lfp too!)
    1.10 +*)
    1.11 +
    1.12 +Gfp = Lfp +
    1.13 +consts gfp :: "['a set=>'a set] => 'a set"
    1.14 +defs
    1.15 + (*greatest fixed point*)
    1.16 + gfp_def "gfp(f) == Union({u. u <= f(u)})"
    1.17 +end