2000-05-23 paulson Multisets have a zero: the empty multiset
2000-05-23 paulson defining 0::int to be (int 0)
2000-05-23 paulson Now that 0 is overloaded, constant "zero" and its type class "zero" are
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(0) -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip