src/CCL/lfp.thy
author paulson
Mon Dec 07 18:26:25 1998 +0100 (1998-12-07)
changeset 6019 0e55c2fb2ebb
parent 0 a5a9c433f639
permissions -rw-r--r--
tidying
     1 (*  Title: 	HOL/lfp.thy
     2     ID:         $Id$
     3     Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
     4     Copyright   1992  University of Cambridge
     5 
     6 The Knaster-Tarski Theorem
     7 *)
     8 
     9 Lfp = Set +
    10 consts lfp :: "['a set=>'a set] => 'a set"
    11 rules
    12  (*least fixed point*)
    13  lfp_def "lfp(f) == Inter({u. f(u) <= u})"
    14 end