Source: Notre Dame J. Formal Logic Volume 51, Number 2
(2010), 161-179.
This paper presents a formalization of first-order arithmetic characterizing the
natural numbers as abstracta of the equinumerosity relation. The
formalization turns on the interaction of a nonstandard (but still first-order)
cardinality quantifier with an abstraction operator assigning objects to
predicates. The project draws its philosophical motivation from a
nonreductionist conception of logicism, a deflationary view of abstraction, and
an approach to formal arithmetic that emphasizes the cardinal properties
of the natural numbers over the structural ones.
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