src/CCL/Lfp.thy
author clasohm
Thu Sep 16 12:20:38 1993 +0200 (1993-09-16)
changeset 0 a5a9c433f639
child 1474 3f7d67927fe2
permissions -rw-r--r--
Initial revision
     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