Published online by Cambridge University Press: 01 January 2020
It has been widely accepted in the past and it remains accepted in many quarters even now, that an ontologically economical (nominalist or fictionalist) position is to be rejected if the corresponding Platonic or otherwise ontologically prodigal discourse cannot be translated, paraphrased or otherwise ‘reduced’ to discourse exhibiting a more economical ontology. Such an attitude is often accompanied by
(a) the claim that the prodigal ontology explains some important truths
and
(b) the demand that the nominalist or fictionalist or economicalist provide an alternative explanation for those truths — perhaps in terms of ontologically economical ersatz substitutes for the prodigal entities.
1 Earlier versions of this paper were read to the Philosophy Department at the University of Queensland, to the Australasian Association of Philosophy in Canberra in 1989, and to the Faculty of History and Philosophy of Science at the University of Cambridge in 1990. I am indebted to all who took part in the subsequent discussions, not least my colleagues at the University of Queensland, and many others, including Jim Mackenzie, Richard Sylvan, David Papineau, Jonathan Harrison, Jeremy Butterfield, Jack Smart, and Graham Nerlich for feedback on these ideas. I am indebted also to an anonymous referee and to the editor of the Canadian Journal of Philosophy for some helpful suggestions which were incorporated into the final draft.
2 See Field, H. Science Without Numbers (Princeton: Princeton University Press 1980Google Scholar) and Realism, Mathematics and Modality (Oxford: Basil Blackwell 1989).
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