Lfp.thy
author lcp
Thu, 18 Aug 1994 12:07:51 +0200
changeset 109 c53c19fb22cb
parent 0 7949f97df77a
child 116 ab4328bbff70
permissions -rw-r--r--
HOL/Nat: rotated arguments of nat_case; added translation for case macro HOL/Nat/nat_ss0: new, for first definition of nat_ss

(*  Title: 	HOL/lfp.thy
    ID:         $Id$
    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1992  University of Cambridge

The Knaster-Tarski Theorem
*)

Lfp = Sum +
consts lfp :: "['a set=>'a set] => 'a set"
rules
 (*least fixed point*)
 lfp_def "lfp(f) == Inter({u. f(u) <= u})"
end