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Arithmetic, First-Order Logic, and Counting Quantifiers

Nicole Schweikardt
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Abstract

This paper gives a thorough overview of what is known about first-order logic with counting quantifiers and with arithmetic predicates. As a main theorem we show that Presburger arithmetic is closed under unary counting quantifiers. Precisely, this means that for every first-order formula phi(y,z_1,...,z_k) over the signature {<,+} there is a first-order formula psi(x,z_1,...,z_k) which expresses over the structure (respectively, over initial segments of this structure) that the variable x is interpreted exactly by the number of possible interpretations of the variable y for which the formula phi(y,z_1,...,z_k) is satisfied. Applying this theorem, we obtain an easy proof of Ruhl's result that reachability (and similarly, connectivity) in finite graphs is not expressible in first-order logic with unary counting quantifiers and addition. Furthermore, the above result on Presburger arithmetic helps to show the failure of a particular version of the Crane Beach conjecture.

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Nicole Schweikardt. 2002-11-19. Arithmetic, First-Order Logic, and Counting Quantifiers. https://arxiv.org/abs/cs/0211022

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