Results for 'a posteriori necessity'

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  1. A Priori Knowledge in Perspective: Naming, Necessity and the Analytic a Posteriori.Stephen Palmquist - 1987 - Review of Metaphysics 41 (2):255 - 282.
    This is the second in a two part series of articles that attempt to clarify the nature and enduring relevance of Kant's concept of a priori knowledge. (For Part I, see below.) In this article I focus mainly on Saul Kripke's critique of Kant, in Naming and Necessity. I argue that Kripke draws attention to a genuine defect in Kant's epistemological framework, but that he used definitions of certain key terms that were quite different from Kant's definitions. When Kripke's (...)
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  2. On the Modal Content of A Posteriori Necessities.Tuomas E. Tahko - 2009 - Theoria 75 (4):344-357.
    This paper challenges the Kripkean interpretation of a posteriori necessities. It will be demonstrated, by an analysis of classic examples, that the modal content of supposed a posteriori necessities is more complicated than the Kripkean line suggests. We will see that further research is needed concerning the a priori principles underlying all a posteriori necessities. In the course of this analysis it will emerge that the modal content of a posteriori necessities can be best described in (...)
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  3. Are There a Posteriori Conceptual Necessities?Daniel Dohrn - 2011 - Philosophical Studies 155 (2):181-197.
    I critically assess Stephen Yablo’s claim that cassinis are ovals is an a posteriori conceptual necessity. One does not know it simply by mastering the relevant concepts but by substantial empirical scrutiny. Yablo represents narrow content by would have turned out -conditionals. An epistemic reading of such conditionals does not bear Yablo’s claim. Two metaphysically laden readings are considered. In one reading, Yablo’s conditionals test under what circumstances concepts remain the same while their extensions diverge. As an alternative, (...)
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  4.  92
    Kripke’s Category Error: Why There Are No Necessary A Posteriori Propositions.Peter Ulric Tse - manuscript
    Kripke’s main argument against descriptivism is rooted in a category error that confuses statements about the world with statements about models of the world. It is only because of the ambiguity introduced by the fact that a single sentence can frame two different propositions, one necessary and the other a posteriori, that one reaches the mistaken conclusion that there can be necessary a posteriori truths. This ambiguity from language was carried over into modal logic by Kripke. However, we (...)
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  5. Abductive Two-Dimensionalism: A New Route to the A Priori Identification of Necessary Truths.Biggs Stephen & Wilson Jessica - forthcoming - Synthese:1-35.
    Epistemic two-dimensional semantics (E2D), advocated by Chalmers (2006) and Jackson (1998), among others, aims to restore the link between necessity and a priority seemingly broken by Kripke (1972/1980), by showing how armchair access to semantic intensions provides a basis for knowledge of necessary a posteriori truths (among other modal claims). The most compelling objections to E2D are that, for one or other reason, the requisite intensions are not accessible from the armchair (see, e.g., Wilson 1982, Melnyk 2008). As (...)
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  6. On a Priori Knowledge of Necessity.Juhani Yli-Vakkuri & Margot Strohminger - manuscript
    The idea that the epistemology of modality is in some sense a priori is a popular one, but it has turned out to be difficult to precisify in a way that does not expose it to decisive counterexamples. The most common precisifications follow Kripke’s suggestion that cases of necessary a posteriori truth that can be known a priori to be necessary if true ‘may give a clue to a general characterization of a posteriori knowledge of necessary truths’. The (...)
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  7. A New Definition of A Priori Knowledge: In Search of a Modal Basis.Tuomas E. Tahko - 2008 - Metaphysica 9 (2):57-68.
    In this paper I will offer a novel understanding of a priori knowledge. My claim is that the sharp distinction that is usually made between a priori and a posteriori knowledge is groundless. It will be argued that a plausible understanding of a priori and a posteriori knowledge has to acknowledge that they are in a constant bootstrapping relationship. It is also crucial that we distinguish between a priori propositions that hold in the actual world and merely possible, (...)
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  8. Knowledge of Necessity: Logical Positivism and Kripkean Essentialism.Stephen K. Mcleod - 2008 - Philosophy 83 (2):179-191.
    By the lights of a central logical positivist thesis in modal epistemology, for every necessary truth that we know, we know it a priori and for every contingent truth that we know, we know it a posteriori. Kripke attacks on both flanks, arguing that we know necessary a posteriori truths and that we probably know contingent a priori truths. In a reflection of Kripke's confidence in his own arguments, the first of these Kripkean claims is far more widely (...)
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  9. A Priori and A Posteriori: A Bootstrapping Relationship.Tuomas E. Tahko - 2011 - Metaphysica 12 (2):151-164.
    The distinction between a priori and a posteriori knowledge has been the subject of an enormous amount of discussion, but the literature is biased against recognizing the intimate relationship between these forms of knowledge. For instance, it seems to be almost impossible to find a sample of pure a priori or a posteriori knowledge. In this paper, it will be suggested that distinguishing between a priori and a posteriori is more problematic than is often suggested, and that (...)
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  10. Salmon on the Contingent a Priori and the Necessary a Posteriori.Graham Oppy - 1994 - Philosophical Studies 73 (1):5 - 33.
    This paper is an examination of the contingent a priori and the necessary a posteriori. In particular, it considers -- and assesses -- the criticisms that Nathan Salmon makes of the views of Saul Kripke.
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  11. Natural Kind Essentialism Revisited.Tuomas E. Tahko - 2015 - Mind 124 (495):795-822.
    Recent work on Natural Kind Essentialism has taken a deflationary turn. The assumptions about the grounds of essentialist truths concerning natural kinds familiar from the Kripke-Putnam framework are now considered questionable. The source of the problem, however, has not been sufficiently explicated. The paper focuses on the Twin Earth scenario, and it will be demonstrated that the essentialist principle at its core (which I call IDENT)—that necessarily, a sample of a chemical substance, A, is of the same kind as another (...)
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  12. A Posteriori Physicalism and Introspection.Andreas Elpidorou - 2017 - Pacific Philosophical Quarterly 98 (1):474-500.
    Introspection presents our phenomenal states in a manner otherwise than physical. This observation is often thought to amount to an argument against physicalism: if introspection presents phenomenal states as they essentially are, then phenomenal states cannot be physical states, for we are not introspectively aware of phenomenal states as physical states. In this article, I examine whether this argument threatens a posteriori physicalism. I argue that as along as proponents of a posteriori physicalism maintain that phenomenal concepts present (...)
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  13. Neural Materialism, Pain's Badness, and a Posteriori Identities.Irwin Goldstein - 2004 - In Maite Ezcurdia, Robert Stainton & Christopher Viger (eds.), Canadian Journal of Philosophy. University of Calgary Press. pp. 261-273.
    Orthodox neural materialists think mental states are neural events or orthodox material properties of neutral events. Orthodox material properties are defining properties of the “physical”. A “defining property” of the physical is a type of property that provides a necessary condition for something’s being correctly termed “physical”. In this paper I give an argument against orthodox neural materialism. If successful, the argument would show at least some properties of some mental states are not orthodox material properties of neural events. Opposing (...)
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  14. Weak and Strong Necessity Modals: On Linguistic Means of Expressing "A Primitive Concept OUGHT".Alex Silk - forthcoming - In Meaning, Decision, and Norms: Themes from the Work of Allan Gibbard.
    This paper develops an account of the meaning of `ought', and the distinction between weak necessity modals (`ought', `should') and strong necessity modals (`must', `have to'). I argue that there is nothing specially ``strong'' about strong necessity modals per se: uses of `Must p' predicate the (deontic/epistemic/etc.) necessity of the prejacent p of the actual world (evaluation world). The apparent ``weakness'' of weak necessity modals derives from their bracketing whether the necessity of the prejacent (...)
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  15. The Discovery That Phosphorus is Hesperus: A Follow-Up to Kripke on the Necessity of Identity.M. J. García-Encinas - 2017 - Analysis and Metaphysics 16:52-69.
    It was an empirical discovery that Phosphorus is Hesperus. According to Kripke, this was also the discovery of a necessary fact. Now, given Kripke’s theory of direct reference one could wonder what kind of discovery this is. For we already knew Phosphorus/Hesperus, and we also knew that any entity is, necessarily, identical to itself. So what is it that was discovered? I want to show that there is more to this widely known case than what usual readings, and critics, reveal; (...)
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  16. Noncivil Disobedience and the Right of Necessity. A Point of Convergence.Alejandra Mancilla - 2012 - Krisis 3:3-15.
    Given the conceptual gap in the global justice debate today (where most of the talk is about the duties of the rich, but little is said about what the poor may do for themselves), in this article I reintroduce the idea of a right of necessity. I first delineate a normative framework for such a right, inspired by these historical accounts. I then offer a contemporary case where the exercise of the right of necessity would be morally legitimate (...)
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  17.  71
    Peacocke’s Epiphany: A Possible Problem for Semantic Approaches to Metaphysical Necessity.Jon Barton - 2012 - Philosophia Scientiae 16 (2):99-116.
    In his _Being Known_ Peacocke sets himself the task of answering how we come to know about metaphysical necessities. He proposes a semantic principle-based conception consisting of, first, his Principles of Possibility which pro­vide necessary and sufficient conditions for a new concept 'admissibility', and second, characterizations of possibility and of necessity in terms of that new con­cept. I focus on one structural feature; viz. the recursive application involved in the specification of 'admissibility'. After sketching Peacocke’s proposal, I intro­duce a (...)
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  18. Naming and Necessity From a Functional Point of View.Osamu Kiritani - 2013 - Croatian Journal of Philosophy 13 (1):93-98.
    The aim of this paper is to develop a new connection between naming and necessity. I argue that Kripke’s historical account of naming presupposes the functional necessity of naming. My argument appeals to the etiological notion of function, which can be thought to capture the necessity of functionality in historical terms. It is shown that the historical account of naming entails all conditions in an etiological definition of function.
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  19. Against the Necessity of Functional Roles for Conscious Experience: Reviving and Revising a Neglected Argument.Gary Bartlett - 2014 - Journal of Consciousness Studies 21 (1-2):33-53.
    While the claim that certain functional states are sufficient for conscious experience has received substantial critical attention, the claim that functional states are necessary is rarely addressed. Yet the latter claim is perhaps now more common than the former. I aim to revive and revise a neglected argument against the necessity claim, by Michael Antony. The argument involves manipulating a conscious subject's brain so as to cancel a disposition which is supposedly crucial to the realization of an experience that (...)
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  20. A Definition of Necessity.George Bealer - 2006 - Philosophical Perspectives 20 (1):17–39.
    In the history of philosophy, especially its recent history, a number of definitions of necessity have been ventured. Most people, however, find these definitions either circular or subject to counterexamples. I will show that, given a broadly Fregean conception of properties, necessity does indeed have a noncircular counterexample-free definition.
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  21. Necessity, Possibility and Determinism in Stoic Thought.Vanessa de Harven - 2016 - In Max Cresswel, Edwin Mares & Adriane Rini (eds.), Logical Modalities from Aristotle to Carnap: The Story of Necessity. Cambridge: Cambridge University Press. pp. 70-90.
    At the heart of the Stoic theory of modality is a strict commitment to bivalence, even for future contingents. A commitment to both future truth and contingency has often been thought paradoxical. This paper argues that the Stoic retreat from necessity is successful. it maintains that the Stoics recognized three distinct senses of necessity and possibility: logical, metaphysical and providential. Logical necessity consists of truths that are knowable a priori. Metaphysical necessity consists of truths that are (...)
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  22.  22
    On the Abuse of the Necessary a Posteriori.Helen Beebee & Nigel Sabbarton-Leary - 2010 - In Helen Beebee & Nigel Sabbarton-Leary (eds.), The Semantics and Metaphysics of Natural Kinds. New York & London: Routledge. pp. 159--79.
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  23.  63
    Los capítulos I-IV del Monologion de san Anselmo de Canterbury como partes de una única vía argumentativa a posteriori para demostrar la existencia de Dios.Nicolás Olivares Bøgeskov - 2016 - Brasiliensis 5 (10):7-32.
    The article analyzes the a posteriori argumentation for the existence of God present in saint Anselm’s Monologion. It defends that the arguments in chapters I-IV are parts of a single argumentative way comparable with the fourth way of Thomas Aquinas. The only starting point for the argumentation is the evidence of the degrees of transcendental perfection (goodness and greatness) found in things. According to this single point of departure, the argument also has a single formulation of the principle of (...)
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  24.  25
    Necessity, a Leibnizian Thesis, and a Dialogical Semantics.Mohammad Shafiei - 2017 - South American Journal of Logic 3 (1):1-23.
    In this paper, an interpretation of "necessity", inspired by a Leibnizian idea and based on the method of dialogical logic, is introduced. The semantic rules corresponding to such an account of necessity are developed, and then some peculiarities, and some potential advantages, of the introduced dialogical explanation, in comparison with the customary explanation offered by the possible worlds semantics, are briefly discussed.
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  25. The Necessity of Exosomatic Knowledge for Civilization and a Revision to Our Epistemology.Ray Scott Percival - 2012 - In Norbert-Bertrand Barbe (ed.), Le Néant dans la Pensée contemporaine. [The Nothing in Contemporary Thought.]. pp. 136-150.
    The traditional conception of knowledge is justified, true belief. If one looks at a modern textbook on epistemology, the great bulk of questions with which it deals are to do with personal knowledge, as embodied in beliefs and the proper experiences that someone ought to have had in order to have the right (or justification) to know. I intend to argue that due to the explosive growth of knowledge whose domain is “outside the head”, this conception has outlived its relevance. (...)
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  26. A Likely Account of Necessity: Plato's Receptacle as a Physical and Metaphysical Foundation for Space.Barbara Sattler - 2012 - Journal of the History of Philosophy 50 (2):159-195.
    This paper aims to show that—and how—Plato’s notion of the receptacle in the Timaeus provides the conditions for developing a mathematical as well as a physical space without itself being space. In response to the debate whether Plato’s receptacle is a conception of space or of matter, I suggest employing criteria from topology and the theory of metric spaces as the most basic ones available. I show that the receptacle fulfils its main task–allowing the elements qua images of the Forms (...)
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  27. Does Chance Hide Necessity ? A Reevaluation of the Debate ‘Determinism - Indeterminism’ in the Light of Quantum Mechanics and Probability Theory.Louis Vervoort - 2013 - Dissertation, University of Montreal
    In this text the ancient philosophical question of determinism (“Does every event have a cause ?”) will be re-examined. In the philosophy of science and physics communities the orthodox position states that the physical world is indeterministic: quantum events would have no causes but happen by irreducible chance. Arguably the clearest theorem that leads to this conclusion is Bell’s theorem. The commonly accepted ‘solution’ to the theorem is ‘indeterminism’, in agreement with the Copenhagen interpretation. Here it is recalled that indeterminism (...)
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  28.  58
    Immigrants, Precarious Workforce as a Structural Necessity of Modern Global Capitalism.Łukasz Rąb - 2016 - Studies in Global Ethics and Global Education 6:69-75.
    This article focuses on the socio-economic aspects of migration and migrants – economic refugees. The author presents the migrants as a precarious workforce, which is an indispensable part of modern global capitalism. In this article, the author points out that among the many factors influencing migration, the economic ones play the most crucial role. Forces released by the neo-liberal paradigm led to the global economic and social tensions. This is due to the fact that the market has become the only (...)
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  29. Nature as a Good Housekeeper. Secondary Teleology and Material Necessity in Aristotle’s Biology.Mariska Leunissen - 2010 - Apeiron 43 (4):117-142.
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  30. Presupposition and the a Priori.Nate Charlow - 2013 - Philosophical Studies 165 (2):509-526.
    This paper argues for and explores the implications of the following epistemological principle for knowability a priori (with 'Ka' abbreviating 'it is knowable a priori that'). -/- (AK) For all ϕ, ψ such that ϕ semantically presupposes ψ: if Ka(ϕ), Ka(ψ). -/- Well-known arguments for the contingent a priori and a priori knowledge of logical truth founder when the semantic presuppositions of the putative items of knowledge are made explicit. Likewise, certain kinds of analytic truth turn out to carry semantic (...)
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  31.  73
    Still a New Problem for Defeasibility: A Rejoinder to Borges.John N. Williams - 2016 - Logos and Episteme 7 (1):83-94.
    I objected that the defeasibility theory of knowledge prohibits you from knowing that you know that p if your knowledge that p is a posteriori. Rodrigo Borges claims that Peter Klein has already satisfactorily answered a version of my objection. He attempts to defend Klein’s reply and argues that my objection fails because a principle on which it is based is false.I will show that my objection is not a version of the old one that Klein attempts (unsuccessfully) to (...)
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  32. Properties in a Contingentist's Domain.Kristie Miller - 2013 - Pacific Philosophical Quarterly 94 (2):225-245.
    This article attempts to make sense of property contingentism, the view that the metaphysical nature of properties is contingent. That is, it is contingent whether properties are universals or tropes or some other kind of entity. The article argues that even if one thinks that necessities are exhausted by conceptual truths and a posteriori necessities, the sort of methodology that can lead one to endorse contingentism in various domains in metaphysics does not give us good grounds to suppose that (...)
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  33. Linking Necessity to Apriority.Tristan Haze - 2019 - Acta Analytica 34 (1):1-7.
    There is an important and fairly straightforward link between necessity and apriority which can shed light on our knowledge of the former, but initially plausible attempts to spell out what it is fall victim to counterexamples. Casullo discusses one such proposal, argues—following Anderson :1–20, )—that it fails, and suggests an alternative. In this paper, I argue that Casullo’s alternative also fails, before making a suggestion for which I can find no counterexamples and which, notably, handles some recent examples due (...)
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  34. Contingentism in Metaphysics.Kristie Miller - 2010 - Philosophy Compass 5 (11):965-977.
    In a lot of domains in metaphysics the tacit assumption has been that whichever metaphysical principles turn out to be true, these will be necessarily true. Let us call necessitarianism about some domain the thesis that the right metaphysics of that domain is necessary. Necessitarianism has flourished. In the philosophy of maths we find it held that if mathematical objects exist, then they do of necessity. Mathematical Platonists affirm the necessary existence of mathematical objects (see for instance Hale and (...)
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  35.  98
    Review of Andrew Melnyk, A Physicalist Manifesto. [REVIEW]Andrew Botterell - 2005 - Philosophical Review 114 (1):125-128.
    A review of Andrew Melnyk, A Physicalist Manifesto: Thoroughly Modern Materialism (Cambridge University Press, 2003).
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  36. The Idea of A Priori Thinking Revisited.Sanjit Chakraborty - 2017 - Philosophia: E-Journal for Philosophy and Culture 17.
    In this article I would like to discuss the concept of a priori mainly focusing on Kant’s Copernican revolution. How is metaphysics at all possible and how a priority takes place in Kantian metaphysics are the questions that I have addressed in the first part of my article. In this context, I have explained analytic, synthetic distinction from epistemological, metaphysical and semantical perspectives and I want to show how the concept of a priori and other associated notions are derived from (...)
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  37. On the Metaphysical Contingency of Laws of Nature.Alan Sidelle - 2002 - In John Hawthorne & Tamar Szabó Gendler (eds.), Conceivability and Possibility. Oxford University Press. pp. 309--336.
    This paper defends the traditional view that the laws of nature are contingent, or, if some of them are necessary, this is due to analytic principles for the individuation of the law-governed properties. Fundamentally, I argue that the supposed explanatory purposes served by taking the laws to be necessary --showing how laws support counterfactuals, how properties are individuated, or how we have knowledge of properties--are in fact undermined by the continued possibility of the imagined scenarios--this time, described neutrally--which seemed to (...)
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  38. Internalists Beware—We Might All Be Amoralists!Gunnar Björnsson & Ragnar Francén Olinder - 2013 - Australasian Journal of Philosophy 91 (1):1 - 14.
    Standard motivational internalism is the claim that by a priori or conceptual necessity, a psychological state is a moral opinion only if it is suitably related to moral motivation. Many philosophers, the authors of this paper included, have assumed that this claim is supported by intuitions to the effect that amoralists?people not suitably related to such motivation?lack moral opinions proper. In this paper we argue that this assumption is mistaken, seeming plausible only because defenders of standard internalism have failed (...)
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  39. Empirically-Informed Modal Rationalism.Tuomas Tahko - 2017 - In Robert William Fischer & Felipe Leon (eds.), Modal Epistemology After Rationalism. Synthese Library. pp. 29-45.
    In this chapter, it is suggested that our epistemic access to metaphysical modality generally involves rationalist, a priori elements. However, these a priori elements are much more subtle than ‘traditional’ modal rationalism assumes. In fact, some might even question the ‘apriority’ of these elements, but I should stress that I consider a priori and a posteriori elements especially in our modal inquiry to be so deeply intertwined that it is not easy to tell them apart. Supposed metaphysically necessary identity (...)
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  40. Anti-Exceptionalism About Logic.Stephen Read - forthcoming - Australasian Journal of Logic.
    Anti-exceptionalism about logic is the doctrine that logic does not require its own epistemology, for its methods are continuous with those of science. Although most recently urged by Williamson, the idea goes back at least to Lakatos, who wanted to adapt Popper's falsificationism and extend it not only to mathematics but to logic as well. But one needs to be careful here to distinguish the empirical from the a posteriori. Lakatos coined the term ‘quasi-empirical' for the counterinstances to putative (...)
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  41.  87
    Critical Notice of Scott Soames, Beyond Rigidity.Michael McKinsey - 2005 - Canadian Journal of Philosophy 35 (1):149-168.
    In this admirable book, Scott Soames provides well defended answers to some of the most difficult and important questions in the philosophy of language, and he does so with characteristic thoroughness, clarity, and rigor. The book's title is appropriate, since it does indeed go ‘beyond rigidity’ in many ways. Among other things, Soames does the following in the course of the book. He persuasively argues that the main thesis of Kripke's Naming and Necessity—that ordinary names are rigid designators—can be (...)
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  42.  46
    Beyond Rigidity.Michael McKinsey - 2005 - Canadian Journal of Philosophy 35 (1):149-168.
    In this admirable book, Scott Soames provides well defended answers to some of the most difficult and important questions in the philosophy of language, and he does so with characteristic thoroughness, clarity, and rigor. The book's title is appropriate, since it does indeed go ‘beyond rigidity’ in many ways. Among other things, Soames does the following in the course of the book. He persuasively argues that the main thesis of Kripke's Naming and Necessity—that ordinary names are rigid designators—can be (...)
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  43. The Epistemology of Essence.Tuomas Tahko - 2018 - In Alexander Carruth, S. C. Gibb & John Heil (eds.), Ontology, Modality, Mind: Themes from the Metaphysics of E. J. Lowe. Oxford, UK: Oxford University Press. pp. 93-110.
    The epistemology of essence is a topic that has received relatively little attention, although there are signs that this is changing. The lack of literature engaging directly with the topic is probably partly due to the mystery surrounding the notion of essence itself, and partly due to the sheer difficulty of developing a plausible epistemology. The need for such an account is clear especially for those, like E.J. Lowe, who are committed to a broadly Aristotelian conception of essence, whereby essence (...)
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  44. Soames's Deflationism About Modality.Tuomas E. Tahko - 2013 - Erkenntnis 78 (6):1367-1379.
    One type of deflationism about metaphysical modality suggests that it can be analysed strictly in terms of linguistic or conceptual content and that there is nothing particularly metaphysical about modality. Scott Soames is explicitly opposed to this trend. However, a detailed study of Soames’s own account of modality reveals that it has striking similarities with the deflationary account. In this paper I will compare Soames’s account of a posteriori necessities concerning natural kinds with the deflationary one, specifically Alan Sidelle’s (...)
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  45. Philosophical Insights and Modal Cognition.Mikkel Gerken - 2015 - In Eugen Fischer John Collins (ed.), Experimental Philosophy, Rationalism, and Naturalism. pp. 110-131.
    Modal rationalists uphold a strong constitutive relationship between a priori cognition and modal cognition. Since both a priori cognition and modal cognition have been taken to be characteristic of philosophical insights, I will critically assess an ambitious modal rationalism and an associated ambitious methodological rationalism. I begin by examining Kripkean cases of the necessary a posteriori in order to characterize the ambitious modal rationalism that will be the focus of my criticism. I then argue that there is a principled (...)
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  46.  81
    The Reduction of Necessity to Essence.Andreas Ditter - forthcoming - Mind.
    In `Essence and Modality', Kit Fine proposes that for a proposition to be metaphysically necessary is for it to be true in virtue of the nature of all objects whatsoever. Call this view Fine's Thesis. This paper is a study of Fine's Thesis in the context of Fine's logic of essence (LE). Fine himself has offered his most elaborate defense of the thesis in the context of LE. His defense rests on the widely shared assumption that metaphysical necessity obeys (...)
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  47. Putting Modal Metaphysics First.Antonella Mallozzi - 2018 - Synthese:1-20.
    I propose that we approach the epistemology of modality by putting modal metaphysics first and, specifically, by investigating the metaphysics of essence. Following a prominent Neo-Aristotelian view, I hold that metaphysical necessity depends on the nature of things, namely their essences. I further clarify that essences are core properties having distinctive superexplanatory powers. In the case of natural kinds, which is my focus in the paper, superexplanatoriness is due to the fact that the essence of a kind is what (...)
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  48.  90
    Natural Deduction for Diagonal Operators.Fabio Lampert - 2017 - In Maria Zack & Dirk Schlimm (eds.), Research in History and Philosophy of Mathematics: The CSHPM 2016 Annual Meeting in Calgary, Alberta. Cham: Birkhäuser. pp. 39-51.
    We present a sound and complete Fitch-style natural deduction system for an S5 modal logic containing an actuality operator, a diagonal necessity operator, and a diagonal possibility operator. The logic is two-dimensional, where we evaluate sentences with respect to both an actual world (first dimension) and a world of evaluation (second dimension). The diagonal necessity operator behaves as a quantifier over every point on the diagonal between actual worlds and worlds of evaluation, while the diagonal possibility quantifies over (...)
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  49. The Broadest Necessity.Andrew Bacon - 2018 - Journal of Philosophical Logic 47 (5):733-783.
    In this paper the logic of broad necessity is explored. Definitions of what it means for one modality to be broader than another are formulated, and it is proven, in the context of higher-order logic, that there is a broadest necessity, settling one of the central questions of this investigation. It is shown, moreover, that it is possible to give a reductive analysis of this necessity in extensional language. This relates more generally to a conjecture that it (...)
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  50. Certainty, Necessity, and Knowledge in Hume's Treatise.Miren Boehm - 2013 - In Stanley Tweyman (ed.), David Hume, A Tercentenary Tribute [the version in PhilPapers is the accurate, final version of the paper].
    Hume appeals to different kinds of certainties and necessities in the Treatise. He contrasts the certainty that arises from intuition and demonstrative reasoning with the certainty that arises from causal reasoning. He denies that the causal maxim is absolutely or metaphysically necessary, but he nonetheless takes the causal maxim and ‘proofs’ to be necessary. The focus of this paper is the certainty and necessity involved in Hume’s concept of knowledge. I defend the view that intuitive certainty, in particular, is (...)
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