Thu, 30 Jun 2011 14:55:01 +0200 wenzelm prefer Isabelle path algebra;
Thu, 30 Jun 2011 14:51:32 +0200 wenzelm proper fold order;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip