Online research in philosophy

Discourse carries thin commitment to objects of a certain sort iff it says or implies that there are such objects. It carries a thick commitment to such objects iff an account of what determines truth-values for its sentences say or implies that there are such objects. This paper presents two model-theoretic semantics for mathematical discourse, one reflecting thick commitment to mathematical objects, the other reflecting only a thin commitment to them. According to the latter view, for example, the semantic role of number-words is not designation but rather the encoding of cardinality-quantifiers. I also present some reasons for preferring this view.

In this paper, I argue against constructive empiricism that, as far as science is concerned, observability is not an adequate criterion as a guidance of cautious ontological commitment. My argument is in two stages. First, I argue that constructive empiricist choice of observability as a criterion for ontological commitment is based on the assumption that belief in the existence of unobservable entities is unreasonable because belief in the existence of an entity can only be vindicated by its observation. Second, I argue that the kind of ontological commitment that is under consideration when accepting a theory is commitment to what I call a theoretical kind and that observation can vindicate commitment to kinds only in exceptional cases.

On the truthmaker view of ontological commitment [Heil (From an ontological point of view, 2003); Armstrong (Truth and truthmakers, 2004); Cameron (Philosophical Studies, 2008)], a theory is committed to the entities needed in the world for the theory to be made true. I argue that this view puts truthmaking to the wrong task. None of the leading accounts of truthmaking—via necessitation, supervenience, or grounding—can provide a viable measure of ontological commitment. But the grounding account does provide a needed constraint on what is fundamental. So I conclude that truthmaker commitments are not a rival to quantifier commitments, but a needed complement. The quantifier commitments are what a theory says exists, while the truthmaker commitments are what a theory says is fundamental.

This article examines one way in which a fiction can carry ontological commitments. The ontological commitments that the article examines arise in cases where there are norms governing discourse about items in a fiction that cannot be accounted for by reference to the contents of the sentences that constitute a canonical telling of that fiction. In such cases, a fiction may depend for its contents on the real-world properties of real-world items, and the fiction may, in that sense, be ontologically committed. Having outlined a way of gauging the ontological commitments of a fiction, the article concludes by illustrating the way in which these considerations can be put to work in assessing the prospects of using fictionalism as a tactic for understanding the metaphysics of modality without incurring a commitment to the real existence of merely possible worlds.

This paper provides a comparison of three fundamentally different approaches to the issue of ontological commitment. It argues that despite superficial similarities on either side, Buridan’s approach provides an intriguing third alternative to the two commonly recognized modern approaches. Keywords: ontological commitment, existence, meaning, reference..

There are two doctrines for which Quine is particularly well known: the doctrine of ontological commitment and the inscrutability thesis—the thesis that reference and quantification are inscrutable. At first glance, the two doctrines are squarely at odds. If there is no fact of the matter as to what our expressions refer to, then it would appear that no determinate commitments can be read off of our best theories. We argue here that the appearance of a clash between the two doctrines is illusory. The reason that there is no real conflict is not simply that in determining our theories’ ontological commitments we naturally rely on our home language but also (and more importantly) that ontological commitment is not intimately tied to objectual quantification and a reference-first approach to language. Or so we will argue. We conclude with a new inscrutability argument which rests on the observation that the notion of objectual quantification, when properly cashed out, deflates.

Truthmaking and ontological commitment How do we determine the ontological commitments of a theory? Quine told us to look to the quantifier.1 What must be in the domain of the quantifiers if the (regimented) sentences of the theory are all to be true? Those are the ontological commitments of the theory.

There are two different ways of understanding the notion of ‘ontological commitment’. A question about ‘what is said to be’ by a theory or ‘what a theory says there is’ deals with ‘explicit’ commitment; a question about the ontological costs or preconditions of the truth of a theory concerns ‘implicit’ commitment. I defend a conception of ontological commitment as implicit commitment, and argue that existentially quantified idioms in natural language are implicitly, but not explicitly, committing. I use the distinction between the two kinds of ontological commitment to diagnose a flaw in a widely used argument to the effect that existential quantification is not ontologically committing.

For Quine, the ontological commitments of a discourse are what fall under its (objectual) quantifiers. The recent literature, however, is beginning to move away from this picture. There are direct challenges to Quine's criterion, and there are also attempts to provide alternatives. Azzouni suggests that the ontological commitments of a discourse should be determined by an existence predicate instead. The availability of this alternative forces an adjudication between Qune's criterion and the predicate approach to ontological commitment. I argue that to adjudicate between these criteria for ontological commitment, we need first to adjudicate between criteria for what exists. My thanks to Jody Azzouni and an anonymous referee for helpful suggestions.