Tue, 23 May 2000 18:28:11 +0200 paulson added type constraint ::nat because 0 is now overloaded
Tue, 23 May 2000 18:24:48 +0200 paulson IntRingDefs is now redundant
Tue, 23 May 2000 18:22:19 +0200 paulson new type class "zero" so that 0 can be overloaded
(0) -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip