fix handling of undefined arithmetics #220
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A term of the form `X+0` was replaced by `X`. This lead to the situation
that the program
q(a).
p(X+0) :- q(X).
would derive `p(a)`, which is not in line with the AG semantics.
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A term of the form
X+0was replaced byX. This lead to the situationthat the program
would derive
p(a), which is not in line with the AG semantics.