replaced apply-style proof for instance Multiset :: plus_ac0 by recommended Isar proof style
(* 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;
print_depth 1;
use_thy "Cube";
print_depth 8;