src/CCL/Lfp.thy
author ballarin
Thu, 28 Nov 2002 15:44:34 +0100
changeset 13736 6ea0e7c43c4f
parent 1474 3f7d67927fe2
child 17456 bcf7544875b2
permissions -rw-r--r--
Transitivity reasoner renamed to linorder.ML. README updated.

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

The Knaster-Tarski Theorem
*)

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