Fri, 23 Apr 1999 11:51:38 +0200 wenzelm chgrp isabelle;
Fri, 23 Apr 1999 11:50:35 +0200 wenzelm detailed proofs;
(0) -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip