Wed, 17 Mar 1999 18:01:41 +0100 wenzelm fixed thm_name again;
Wed, 17 Mar 1999 17:20:36 +0100 wenzelm Theory.sign_of;
(0) -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip