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Philosophia Mathematica Advance Access published online on September 27, 2007
Philosophia Mathematica, doi:10.1093/philmat/nkm034
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Copyright © The Author 2007. Published by Oxford University Press.

Multiple Reductions Revisited{dagger}

Justin Clarke-Doane*

* Department of Philosophy, New York University, 5 Washington Place, New York, N.Y. 10003 U.S.A. jcd305{at}nyu.edu

Paul Benacerraf's argument from multiple reductions consists of a general argument against realism about the natural numbers (the view that numbers are objects), and a limited argument against reductionism about them (the view that numbers are identical with prima facie distinct entities). There is a widely recognized and severe difficulty with the former argument, but no comparably recognized such difficulty with the latter. Even so, reductionism in mathematics continues to thrive. In this paper I develop a difficulty for Benacerraf's argument against reductionism that is of comparable severity to the now widely recognized difficulty with his general argument against realism.

{dagger} Thanks to Kit Fine, Hartry Field, Jeff Sebo, Ted Sider, Stephen Schiffer, and anonymous referees at Philosophia Mathematica for helpful comments on earlier versions of this paper. Thanks to Aron Edidin for many helpful discussions of the problems that inspired it.


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