HOL,ZF/Makefile: enclosed multiple "use" calls in parentheses. This
ensures that if one dies, all die. BUT NOT Pure/Makefile, where
PolyML.use"POLY" makes the identifier "use" visible.
(* Title: HOL/lfp.thy
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1992 University of Cambridge
The Knaster-Tarski Theorem
*)
Lfp = mono +
consts lfp :: "['a set=>'a set] => 'a set"
rules
(*least fixed point*)
lfp_def "lfp(f) == Inter({u. f(u) <= u})"
end