HOL/equalities: added some identities from ZF/equalities
HOL/equalities/constant_UN: renamed UN1_constant
HOL/equalities/Union_Un_distrib: deleted duplicate!
HOL/equalities/Union_Int_subset: new
(* 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