Tue, 07 Oct 1997 12:29:34 +0200 wenzelm The Isabelle Logo;
Mon, 06 Oct 1997 20:00:31 +0200 wenzelm fixed 'begin';
Mon, 06 Oct 1997 19:39:40 +0200 wenzelm optional begin keyword;
(0) -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip