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/gfp.thy
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1992 University of Cambridge
Greatest fixed points
*)
Gfp = Lfp +
consts gfp :: "['a set=>'a set] => 'a set"
rules
(*greatest fixed point*)
gfp_def "gfp(f) == Union({u. u <= f(u)})"
end