Tue, 08 May 2018 10:22:58 +0200 nipkow more "sorted" changes
Tue, 08 May 2018 10:14:36 +0200 nipkow new def of sorted and sorted_wrt
Mon, 07 May 2018 23:08:22 +0200 wenzelm more operations;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 tip