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Deciding whether the ordering is necessary in a Presburger formula

Abstract : We characterize the relations which are first-order definable in the model of the group of integers with the constant 1. This allows us to show that given a relation defined by a first-order formula in this model enriched with the usual ordering, it is recursively decidable whether or not it is first-order definable without the ordering.
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https://hal.inria.fr/hal-00990437
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Christian Choffrut, Achille Frigeri. Deciding whether the ordering is necessary in a Presburger formula. Discrete Mathematics and Theoretical Computer Science, DMTCS, 2010, 12 (1), pp.20-37. ⟨hal-00990437⟩

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