src/CCL/Lfp.thy
author oheimb
Fri Jun 02 20:38:28 2000 +0200 (2000-06-02)
changeset 9028 8a1ec8f05f14
parent 1474 3f7d67927fe2
child 17456 bcf7544875b2
permissions -rw-r--r--
added HOL/Prolog
     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