, Volume 190, Issue 12, pp 2413-2427

First online:

A Truthmaker Indispensability Argument

  • Sam BaronAffiliated withSchool of Philosophical and Historical Enquiry, University of Sydney Email author 

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Recently, nominalists have made a case against the Quine–Putnam indispensability argument for mathematical Platonism by taking issue with Quine’s criterion of ontological commitment. In this paper I propose and defend an indispensability argument founded on an alternative criterion of ontological commitment: that advocated by David Armstrong. By defending such an argument I place the burden back onto the nominalist to defend her favourite criterion of ontological commitment and, furthermore, show that criterion cannot be used to formulate a plausible form of the indispensability argument.


Indispensability Ontological commitment Platonism Nominalism Truthmakers