Fri, 05 Nov 1999 16:41:56 +0100 paulson tidied
Fri, 05 Nov 1999 12:47:29 +0100 paulson new psubset lemma
Fri, 05 Nov 1999 12:47:15 +0100 paulson added foldr
(0) -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip