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Published online by Cambridge University Press: 18 January 2008
We consider logics on $\mathbb{Z}$ and $\mathbb{N}$
which are weaker than Presburger arithmetic and we settle the following decision problem: given a k-ary relation on $\mathbb{Z}$
and $\mathbb{N}$
which are first order definable inPresburger arithmetic, are they definable in theseweaker logics? These logics, intuitively,are obtained by considering modulo and threshold counting predicates for differences of two variables.