Mon, 08 Aug 2011 16:38:59 +0200 wenzelm modernized strcture Proof_Checker;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip