Tue, 23 Nov 2004 18:58:59 +0100 prettier proof of setsum_diff
obua [Tue, 23 Nov 2004 18:58:59 +0100] rev 15318
prettier proof of setsum_diff
(0) -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip