Fixed the bugs introduced by the last commit! Output is now *identical* to that
produced by the old version, based on a-lists.
(* Title: LK/ex/ROOT.ML
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1992 University of Cambridge
Examples for Classical Logic.
*)
time_use "prop.ML";
time_use "quant.ML";
time_use "hardquant.ML";
time_use_thy "Nat";