Pace Necessitism – roughly, the view that existence is not contingent – essential properties provide necessary conditions for the existence of objects. Sufficiency properties, by contrast, provide sufficient conditions, and individual essences provide necessary and sufficient conditions. This paper explains how these kinds of properties can be used to illuminate the ontological status of merely possible objects and to construct a respectable possibilist ontology. The paper also reviews two points of interaction between essentialism and modal logic. First, we will briefly (...) see the challenge that arises against S4 from flexible essential properties; as well as the moves available to block it. After this, the emphasis is put on the Barcan Formula (BF), and on why it is problematic for essentialists. As we will see, Necessitism can accommodate both (BF) and essential properties. What necessitists cannot do at the same time is to continue to understanding essential properties as providing necessary conditions for the existence of individuals; against what might be for some a truism. (shrink)

The paper argues against Peacocke's moderate rationalism in modality. In the first part, I show, by identifying an argumentative gap in its epistemology, that Peacocke's account has not met the Integration Challenge. I then argue that we should modify the account's metaphysics of modal concepts in order to avoid implausible consequences with regards to their possession conditions. This modification generates no extra explanatory gap. Yet, once the minimal modification that avoids those implausible consequences is made, the resulting account cannot support (...) Peacocke's moderate rationalism. (shrink)

There are numerous contexts in which philosophers and others use model-theoretic methods in assessing the validity of ordinary arguments; consider, for example, the use of models built upon 'possible worlds' in examinations of modal arguments. But the relevant uses of model-theoretic techniques may seem to assume controversial semantic or metaphysical accounts of ordinary concepts. So, numerous philosophers have suggested that standard uses of model-theoretic methods in assessing the validity of modal arguments commit one to accepting that modal claims are to (...) be analysed in terms of possible worlds. The paper provides a very general account of how uses of model-theoretic methods in demonstrating facts about validity and invalidity may in fact often be uncoupled from controversial semantic or metaphysical theses, applying the resulting techniques to some modal cases in particular. (shrink)

Some patterns call out for explanation, in the sense that we have a pro tanto reason to reject theories that do not give them an appropriate explanation. I argue that certain modal patterns call out for explanation in this way—and this provides a reason to reject certain theories of modality that fail to explain such patterns. However, I also consider a response to this argument, which claims that the modal patterns do not need explanation. This response might be viable but (...) it involves some substantial commitments about the nature of explanation. (shrink)

Actualists routinely characterize their view by means of the slogan, “Everything is actual.” They say that there aren’t any things that exist but do not actually exist—there aren’t any “mere possibilia.” If there are any things that deserve the label ‘possible world’, they are just actually existing entities of some kind—maximally consistent sets of sentences, or maximal uninstantiated properties, or maximal possible states of affairs, or something along those lines. Possibilists, in contrast, do think that there are mere possibilia, that (...) there are things that are not actual. They think that more exists than what actually exists. All I have done so far, though, is rephrase the slogan in various ways. To say that everything is actual is precisely to say that there are no things that do not actually exist, which is precisely to say that there are no mere possibilia, and which is also precisely to say that we cannot sep- arately quantify over what exists and what is actual. These claims all amount to the same thing. But what is that, exactly? What on earth does it mean to say that everything is actual, that there are no mere possibilia, and so on? What does the actualist slogan really come to? I think the literature is far from clear on this point, and that people work themselves into unnecessary muddles because of it. Indeed, certain confusions that I shall discuss in the first half of this article seem to be on the rise. It is high time to lay out the issues and the choice points as clearly as possible. There are two primary choices to be made; there are two axes along which versions of actualism can vary. One choice has to do with how to treat claims about things that merely could exist. The other choice has to do with the modal status of the view and of how we should think about the “actual” in actualism. I make no claim that the positions I will eventually endorse are star- tlingly new. I think that most people will agree with the decisions I make at both choice points and will in fact find some bits of this essay obvious. But not everyone agrees with my decisions, and it has been my experience that people differ remarkably about which bits they find obvious—a fact I find rather telling. My goal, then, is to show that the two axes are there and to clarify the consequences of the choices. (shrink)

Modal primitivists hold that some modal truths are primitively true. They thus seem to face a special epistemological problem: how can primitive modal truths be known? The epistemological objection has not been adequately developed in the literature. I undertake to develop the objection, and then to argue that the best formulation of the epistemological objection targets all realists about modality, rather than the primitivist alone. Furthermore, the moves available to reductionists in response to the objection are also available to primitivists. (...) I conclude by suggesting that extant theories of the epistemology of modality are not sensitive to the question of primitivism versus reductionism. (shrink)

Due to the influence of Nathan Salmon’s views, endorsement of the “flexibility of origins” thesis is often thought to carry a commitment to the denial of S4. This paper rejects the existence of this commitment and examines how Peacocke’s theory of the modal may accommodate flexibility of origins without denying S4. One of the essential features of Peacocke’s account is the identification of the Principles of Possibility, which include the Modal Extension Principle (MEP), and a set of Constitutive Principles. Regarding (...) their modal status, Peacocke argues for the necessity of MEP, but leaves open the possibility that some of the Constitutive Principles be only contingently true. Here, I show that the contingency of the Constitutive Principles is inconsistent with the recursivity of MEP, and this makes the account validate S4. It is also shown that, compatibly with the necessity of the Constitutive Principles, the account can still accommodate intuitions about flexibility of origins. However, the account we end up with once those intuitions are consistently accommodated may not be satisfactory, and this opens up the debate about whether or not artefacts allow for some variation in their origins. (shrink)

This guide accompanies the following articles: Sonia Roca‐Royes, ‘Essentialism vis‐à‐vis Possibilia, Modal Logic, and Necessitism.’Philosophy Compass 6/1 (2011): 54–64. doi: 10.1111/j.1747‐9991.2010.00363.x. Sonia Roca‐Royes, ‘Essential Properties and Individual Essences.’Philosophy Compass 6/1 (2011): 65–77. doi: 10.1111/j.1747‐9991.2010.00364.x. Author’s Introduction Intuitively, George Clooney could lose a finger and he would still be him. Also intuitively, he could not lose his humanity without ceasing to be altogether. So while he could have one less finger, he could not be other than human. These intuitions suggest that (...) there are two kinds of properties: on the one hand, there are essential properties and, on the other, there are accidental properties. Essentialism is the view that captures those intuitions and claims that some of an object’s properties are essential and some are accidental. Essential properties are often appealed to in metaphysical arguments. Consider the famous Goliath–Lumpl example. Goliath is a clay‐statue, and Lumpl is the piece of clay from which Goliath is made. Are Goliath and Lumpl the same entity, or are they distinct, despite coinciding in the same spatial region (at least for a period of time)? An argument in favour of their distinctness appeals to essential properties. Let s be Goliath’s shape. Lumpl’s current shape is therefore also s. It seems that Lumpl could lose its current shape and still exist. Yet, if Goliath – the statue – were melted, for instance, it would cease to exist. Behind this reasoning is the belief that having shape s is essential to Goliath but not to Lumpl. Goliath and Lumpl can therefore be distinguished by their essential properties. Consequently, and by Leibniz’s Indiscernibility of Identicals– according to which identicals cannot be distinguished – Goliath and Lumpl are distinct objects. The essentialist intuition appealed to in this argument is that shapes are essential to statues but not to pieces of clay. Of course, this particular argument – like any other – can be resisted. It is all the same a good illustration of how essentialism is put to work in metaphysics. A good understanding of the broad phenomenon of essentialism is therefore an unavoidable task, since the credit of a lot of metaphysical arguments partially depends on it. Although the topic has been studied for millenniums, the two papers that this guide accompanies are focused on contemporary issues in essentialism, and so will do this guide too. Author Recommends Fine, Kit. ‘Essence and Modality.’Philosophical Perspectives 8 (1994): 1–16. One of the most cited and influential papers against the modal account of the notion of essence and in favour of what has subsequently been referred to in the literature as ‘the Finean account of the notion of essence’. Forbes, Graeme. The Metaphysics of Modality. Oxford: Clarendon Press, 1985. A foundational work in modality and essentialism. The first two chapters provide a valuable introduction to propositional and first order modal logic. Chapters 5–8 constitute a comprehensive essentialist theory and contain some of the most cited arguments for individual essences. Kripke, Saul. Naming and Necessity, Cambridge, MA: Harvard UP, 1972/1980. Another foundational work. With this book – which is, among other things, a defence of a Direct Theory of Reference – Kripke rescues, after Quine’s powerful attacks against it, and using the semantic rigidity of proper names, (Aristotelian) essentialism. Mackie, Penelope. How Things Might Have Been: Individuals, Kinds and Essential Properties. Oxford: Clarendon Press, 2006. An extremely valuable recent contribution to the field. Here, Mackie defends that, although essentialism is a real phenomenon, there are much fewer essential properties than is standardly believed, and labels this view ‘Minimalist Essentialism’. Beyond the intrinsic interest of the defence of Minimalist Essentialism, the book is also highly recommended for its clear reconstructions – and discussions – of some of the most influential essentialist arguments. In addition, the book’s bibliography is very comprehensive and updated, and it might be a useful resource for students. Plantinga, Alvin. The Nature of Necessity. Oxford: OUP, 1974. Yet another foundational work. Here, Plantinga offers his essentialist theory which, like Forbes’, also incorporates individual essences although of a very different sort from Forbes’. Plantinga believes in purely non‐qualitative individual essences, whereas Forbes’ aims at purely qualitative ones. The book is also excellent to provide a solid background to those unfamiliar with the topic. Roca‐Royes. ‘Essentialism vis‐à‐vis Possibilia, Modal Logic and Necessitism.’Philosophy Compass, 6/1 (2011): 54–64, doi: 10.1111/j.1747‐9991.2010.00363.x. This is one of the two papers this guide accompanies. It contains a comparative examination of two opposed responses to the problem of possibilia. One solution crucially appeals to individual essences and another – compatible with them, but not dependent on them – makes existence a necessary‐whenever‐possible property. Salmon, Nathan. Reference and Essence. Princeton: Princeton UP, 1981. Against what Kripke’s Naming and Necessity might have induced us to believe, Salmon’s Reference and Essence argues that essentialism cannot be derived from the Direct Theory of Reference. Our commitments to essentialism should therefore come from somewhere else. It also contains one of the most cited and influential arguments against the transitivity of the accessibility relation between worlds, which relies on flexible essential properties. Online Materials The Stanford Encyclopedia of Philosophy publishes extremely valuable entries on a vast variety of topics which are conveniently updated and revised. On essentialism, the following are to be highlighted: Teresa Robertson, ‘Essential vs. Accidental Properties’: Takashi Yagisawa, ‘Possible Objects’: Penelope Mackie, ‘Transworld Identity’: PhilPapers is an interactive directory of online philosophical publications to which one can subscribe, and which allows authors to submit their latest work. One might find it useful to check this on a regular basis, since contents are constantly updated. The following link is to the site’s resources on essentialism:. Sample Syllabus Because the phenomenon of essentialism is very broad, one can design an entire course on it, thereby having enough time to see some of the issues in considerable depth. The sample syllabus suggested here is of one such course, focusing exclusively on contemporary issues in essentialism. Less deeply, the topic of essentialism can also be introduced in a general course on metaphysics or on modality. To this effect, focusing on some of the topics suggested in weeks 1–6 below would perhaps be more appropriate than focusing on the more complex issues suggested for weeks 7–10. Week 1. Introduction to Essentialism. Two Notions of Essential Property: The Modal Account and the Finean Account Fine, Kit. ‘Essence and Modality.’Philosophical Perspectives 8 (1994): 1–16. Robertson, Teresa. ‘Essential vs. Accidental Properties.’Stanford Encyclopedia of Philosphy (Fall 2008 Edition). Ed. Edward N. Zalta. URL:. Roca‐Royes, Sonia. ‘Essential Properties and Individual Essences.’Philosophy Compass, 6/1 (2011): 65–77. Sections 1–2. Week 2. Essentialist Principles, I: Three Arguments for the Essentiality of Origin Kripke, Saul. Naming and Necessity. Cambridge, MA: Harvard UP, 1972/1980. Lecture III. Mackie, Penelope. ‘Identity, Time and Necessity.’Proceedings for the Aristotelian Society 98 (1998): 59–78. Rohbraugh, Guy and deRosset, Louis. ‘A New Route to the Necessity of Origin.’Mind 133 (2004): 705–25. Week 3. Essentialist Principles, II: Essentiality of Kind Brody, Baruch. ‘Natural Kinds and Real Essences.’Journal of Philosophy 64 (1967): 431–46. Mackie, Penelope. How Things Might Have Been: Individuals, Kinds and Essential Properties. Oxford: Clarendon Press, 2006. Chapters 7 and 8. Wiggins, David. Sameness and Substance Renewed. Cambridge: Cambridge UP, 2001. Chapter 3. Week 4. Essentialist Principles, III: Natural Kind Essentialism Kripke, Saul. ‘Identity and Necessity.’Identity and Individuation, Ed. M. K. Munitz. New York: New York University Press, 1971. 135–64. Kripke, Saul. Naming and Necessity. Cambridge, MA: Harvard UP, 1972/1980. Lecture III. Putnam, Hilary. ‘The Meaning of “Meaning”.’Minnesota Studies in the Philosophy of Science 7 (1975): 215–71. Week 5. Sufficient‐for‐Existence Properties (and Cross‐World Identification Principles) Chisholm, Roderick. ‘Identity through Possible Worlds: Some Questions.’Noûs 1.1 (1967): 1–8. Mackie, Penelope. How Things Might Have Been: Individuals, Kinds and Essential Properties. Oxford: Clarendon Press, 2006. Chapter 3. Salmon, Nathan. Reference and Essence. Princeton: Princeton UP, 1981. Chapter 7. Week 6. Individual Essences Mackie, Penelope. ‘Transworld Identity.’The Stanford Encyclopedia of Philosophy (Fall 2008 Edition). Ed. Edward N. Zalta. URL:. Section 4. Roca‐Royes, Sonia. ‘Essential Properties and Individual Essences.’Philosophy Compass 6/1 (2011): 65–77. Sections 3–4. Week 7. Flexible Essential Properties and S4 Roca‐Royes, Sonia. ‘Essentialism vis‐à‐vis Possibilia, Modal Logic, and Necessitism.’Philosophy Compass 6/1 (2011): 54–64. Section 3. Salmon, Nathan. Reference and Essence. Princeton: Princeton UP, 1981. Appendix 1. Week 8. Individual Essences and Possibilia Peacocke, Christopher. ‘Principles for Possibilia.’Noûs 36.3 (2002): 486–508. Roca‐Royes, Sonia. ‘Essentialism vis‐à‐vis Possibilia, Modal Logic, and Necessitism.’Philosophy Compass 6/1 (2011): 54–64. Section 2. Week 9. Necessitism and Essentialism: A Third Notion of Essential Property Linsky, Bernard and Zalta, Edward. ‘In Defense of the Contingently Nonconcrete.’Philosophical Studies 84 (1996): 283–94. Roca‐Royes, Sonia. ‘Essentialism vis‐à‐vis Possibilia, Modal Logic, and Necessitism.’Philosophy Compass 6/1 (2011): 54–64. Section 5. Williamson, Timothy. ‘Bare Possibilia.’Erkenntnis 48 (1998): 257–73. Week 10. Essentialism and Modal Logic: The Barcan Formula Menzel, Christopher. ‘Actualism.’The Stanford Encyclopedia of Philosophy (Summer 2010 Edition). Ed. Edward N. Zalta. URL:. Section 2. Roca‐Royes, Sonia. ‘Essentialism vis‐à‐vis Possibilia, Modal Logic, and Necessitism.’Philosophy Compass 6/1 (2011): 54–64. Section 4. Focus Questions • There is a debate as to whether essential properties– as well as individual essences and sufficient‐for‐existence properties– should be specified in purely qualitative terms or whether, by contrast, non‐purely qualitative – or even purely non‐qualitative – specifications are allowed. What are the main arguments against the availability of purely qualitative specifications? • Flexible essential properties seem to be more plausible than non‐flexible ones. Yet, together with sufficient‐for‐existence properties, they imply flexible individual essences. How plausible are these? Should we revise our intuitions supporting flexible essential properties? • What are, ultimately, the ontological differences between a necessitist approach to possibilia and an individual‐essences‐based approach? • According to necessitism, essential properties do not impose necessary conditions for an object’s existence. Can the necessitist, nonetheless, capture this role of essential properties by saying that, when it comes to possibly concrete entities, essential properties provide necessary conditions for an object’s concreteness? Can they, on a similar vein, also offer sufficient‐for‐concreteness properties as a surrogate for the (non‐necessitist’s) sufficient‐for‐existence properties? • Even after the enormous amount of literature that essentialism has generated, we are far from reaching a general agreement as to which properties are essential and which are accidental. Should this be a reason to reflect, critically, on the methodology that is being used in the arguments for or against essential properties? Is reliance on intuitions inescapable? (shrink)

This paper examines the legitimacy of two common methodologies within philosophy: thought experiments and conceptual analysis. In particular, I examine the uses to which these two methodologies have been put within modal epistemology. I argue that, although both methods can be used to reveal conditional essentialist claims (e.g. necessarily: if x is water, then x is H20), neither can be used to reveal the de re essentialists claims (e.g. x is water and x is essentially H20) they’re often taken to (...) reveal. (shrink)

Many are reluctant to accept primitive modality into their fundamental picture of the world. The worry often traces to this thought: we shouldn't adopt any more primitive - that is, unexplained - notions than we need in order to explain all the features of the world, and primitive modal notions are not needed. I examine one prominent rival to modal primitivism, combinatorialism, and show that in order to account for all the modal features of the world the combinatorialist must adopt (...) two additional primitive notions. My own modal primitivist view takes as primitive the notion of incompatibility between properties or relations. I show how the non-modal notions that the combinatorialist must adopt as primitive may be analyzed using my notion. The upshot is that with respect to the number of primitive notions, my modal primitivist theory comes out ahead. (shrink)