Ataollah Hashemi

Ontological pluralism is the view that there are different ways of being. Historically, ways of being are aligned with the ontological categories. This paper is about to investigate why there is such a connection, and how it should be understood. Ontological pluralism suffers from an objection, according to which ontological pluralism collapses into ontological monism, i.e., there is only one way to be. Admitting to ontological categories can save ontological pluralism from this objection if ways of being ground ontological categories.

This paper deals with the question of what the most appropriate semantic theory for theoretical terms would be. Traditionally, in the contemporary literature of philosophy of language, there have been two widely held semantic theories: the descriptivist theory and the causal theory. Comparing theoretical terms with natural kind terms, I attempt to show that the causal theory of reference applies to natural kinds owing to certain ontological and epistemological assumptions of natural kinds realism. I argue that there is no reason to keep these assumptions with respect to theoretical entities. Consequently, the causal theory of reference cannot be applied to theoretical terms. Instead, because of certain ontological and epistemological features of theoretical entities, the rival semantic theory, i.e., the descriptivist theory of reference, properly explains how the referents of these terms get fixed and how these terms find their referents. The paper is structured as follows: the first part deals with the question of how a theoretical entity/kind should be distinguished from non-theoretical ones. The second part facilitates a comparison between theoretical kinds and natural kinds to reveal the ontological and epistemological features of each category. In the third part, I argue why the causal theory of reference fails to be a plausible semantic for theoretical terms, and why its rival theory, i.e., the descriptivist theory, provides an appropriate semantic for such terms. Finally, I raise two potential objections regarding my proposed view and try to show how these objections can be overcome.

Pluralists believe in the occurrence of numerically distinct spatiotemporal coincident objects. They argue that there are coincident objects that share all physical and spatiotemporal properties and relations; nevertheless, they differ in terms of modal and some other profiles. Appealing to the grounding problem according to which nothing can ground the modal differences between coincident objects, monists reject the occurrence of coincident objects. In the first part of this paper, I attempt to show that the dispute between monists and pluralists cannot be settled based upon the grounding problem tout court. I argue that the grounding problem or a very similar problem is a challenge for all monists and pluralists alike if they are ontologically committed to the existence of composite objects as independent entities. In the final part, adopting the Aristotelian account of essence, I propose a solution that enables pluralists to plausibly ground modal differences between coincident objects.

In Spinoza’s ontology, there are only two categories of existing items: an independent entity that is one substance, and dependent entities that are infinite modes; “nothing exists external to the intellect except substances and their affections”(Proof of 1.P.4). Nevertheless, Spinoza introduces a third notion, ‘attribute’, that is defined as “what the intellect perceives of substance as constituting its essence” (1.d.4). Spinoza’s metaphysics is known for the doctrine of substance monism that indicates that only one substance exists. Spinoza, however, explicitly states that “substance consisting of infinite attributes, each of which expresses eternal and infinite essence, necessarily exists.” These remarks create a perplexing puzzle regarding the ontological status of attributes in Spinoza’s philosophy. In the literature, in general, there are two opposite interpretations: the realist view (i.e., Curley (1988)) according to which attributes are real substances; and the anti-realist interpretation (i.e., Wolfson (1934)) that holds that attributes are not metaphysically real. In this paper, I provide some textual evidence from Spinoza’s works that contradicts both mentioned the realist and the anti-realist interpretations. As an alternative, I put forward a new account according to which attributes are real and objective; nevertheless, they should not be understood as distinct things in Spinoza's metaphysics.

This paper delves into the examination of metaphysical knowledge from the unique vantage point of Thomas Reid. While some philosophers, including Immanuel Kant, assert the impossibility of metaphysical knowledge based on specific epistemological and methodological principles, Reid, a proponent of direct realism, presents alternative epistemological and methodological principles that challenge the skeptics’ stance. The primary objective of this paper is to explore whether metaphysical knowledge is attainable through Reid’s perspective. In this paper, I contend that Reid’s direct realism indeed opens up the possibility of metaphysics. Nevertheless, determining whether we truly possess metaphysical knowledge is far from straightforward. Instead, we rely on reliable tests to evaluate the reliability of some metaphysical beliefs.

The grounding problem is related to the puzzle of numerically distinct spatiotemporally coincident objects. Suppose Lumpl –a lump of clay– and Goliath – the statue – are created and later destroyed, simultaneously. They would share all of their physical and spatiotemporal properties and relations. But, Goliath and Lumpl have different modal and sortal properties, which would suggest they are distinct entities, while at the same time entirely co-located. This issue creates a puzzle and raises the question of how two distinct objects can be entirely colocated. Thus, on the one hand, monists (opponents of coincident objects) argue that even though we have given that thing two different names, we should keep in mind that Lumpl and Goliath, for as long as they exist, are entirely similar in terms of their physical and spatiotemporal structures. On the other hand, however, the lump and the statue have different properties. So, pluralists claim that based on Leibniz‘s law, Lumpl and Goliath would be distinct coincident objects. Monists have challenged the possibility and plausibility of the occurrence of coincident objects by the grounding problem: they think that if we accept pluralism, we have to deal with the thorny problem of what grounds the alleged modal differences between Lumpl and Goliath, given that they are similar in all their physical and spatiotemporal aspects. Some monists suspect that pluralists will not be able to find plausible grounds by means of which to explain Lumpl and Goliath‘s modal (and other) differences, and therefore conclude that the grounding problem is a compelling reason to reject pluralism as an untenable approach towards the puzzle of coincident objects. In this thesis, I attempt to show that the grounding problem, contrary to the false advertisement of some monists, does not seriously threaten the possibility and plausibility of the pluralism concerning the existence of numerically distinct spatiotemporally coincident objects. Underlining the plausibility and possibility of the pluralists‘ position, I specify most parts of this thesis as an investigation into how the grounding problem can be solved in support of pluralism. Various solutions to this problem have been proposed by pluralists from different standpoints. In general, most of these significant solutions, based upon general strategies they follow, can be classified into these two categories: the solutions which appeal to the supervenience relations (supervenience-based solutions), and the solutions which take primitivist approaches (primitivist strategies). My research proposes to take up the validity of the aforementioned strategies, and I assess them in relation to the pluralists‘ ability to solve the grounding problem. I argue that both supervenience-based solutions and the some of primitivist strategies – including the modal plenitude, sortal, and identity-based primitivism – are not winning strategies to settle the grounding problem. Considering the point mentioned, I put forward a new account of the primitivist solution to the grounding problem based on the Aristotelian notion of essence which I call ‗essential primitivism‘. I argue that the primitive essences of coincident objects can properly ground the modal and sortal properties making coincident objects distinct.

Ontološki pluralizam je gledište prema kojemu postoje različiti načini postojanja. Povijesno gledano, načini postojanja su usklađeni s ontološkim kategorijama. Ovaj rad istražuje zašto postoji takva veza i kako je treba shvatiti. Ontološki pluralizam pati od prigovora prema kojem se ontološki pluralizam urušava u ontološki monizam, tj. u gledište da postoji samo jedan način postojanja. Priznavanje ontoloških kategorija može spasiti ontološki pluralizam od ovog prigovora ako načini postojanja utemeljuju ontološke kategorije.

Quine, the famous American empiricist philosopher, in wake of his criticisms of quantified modal logic, believes that the logic is committed to a doctrine which he calls Aristotelian Essentialism, and tries to prove that the doctrine is meaningless. He defines Aristotelian Essentialism as a doctrine which distinguishes between things’ essential and accidental properties, and the distinction is independent from the language in which the things are referred to, and also the ways by which they are specified. In the present paper, based on Aristotle's works, I have tried to find out whether Quine has defined the Aristotelian essentialism correctly, and whether his criticisms of essentialism include what Aristotle means by essentialism or not? I have argued that Quine has not analyzed Aristotelian essentialism correctly. Keywords: Essentialism, Modality, Aristotle, Quine.