src/CCL/Lfp.thy
changeset 0 a5a9c433f639
child 1474 3f7d67927fe2
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/CCL/Lfp.thy	Thu Sep 16 12:20:38 1993 +0200
     1.3 @@ -0,0 +1,14 @@
     1.4 +(*  Title: 	HOL/lfp.thy
     1.5 +    ID:         $Id$
     1.6 +    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
     1.7 +    Copyright   1992  University of Cambridge
     1.8 +
     1.9 +The Knaster-Tarski Theorem
    1.10 +*)
    1.11 +
    1.12 +Lfp = Set +
    1.13 +consts lfp :: "['a set=>'a set] => 'a set"
    1.14 +rules
    1.15 + (*least fixed point*)
    1.16 + lfp_def "lfp(f) == Inter({u. f(u) <= u})"
    1.17 +end