Wed, 11 Apr 2012 15:02:48 +0200 wenzelm clarified proof_result: finish proof formally via head tr, not end_tr;
Wed, 11 Apr 2012 14:20:51 +0200 wenzelm tuned;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip