improved the equivariance lemmas for the quantifiers; had to export the lemma eqvt_force_add and eqvt_force_del in the thmdecls
(* Title: Cube/ROOT.ML
ID: $Id$
Author: Tobias Nipkow
Copyright 1992 University of Cambridge
The Lambda-Cube a la Barendregt.
*)
val banner = "Barendregt's Lambda-Cube";
writeln banner;
use_thy "Cube";
use_thy "Example";