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Possible worlds

Noûs 10 (1):65-75 (1976)

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  1. The Way Things Were.Ben Caplan & David Sanson - 2010 - Philosophy and Phenomenological Research 81 (1):24-39.
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  • Island Universes and the Analysis of Modality.Phillip Bricker - 2001 - In Gerhard Preyer & Frank Siebelt (eds.), Reality and Humean Supervenience: Essays on the Philosophy of David Lewis. Rowman & Littlefield Publishers.
    It follows from Humean principles of plenitude, I argue, that island universes are possible: physical reality might have 'absolutely isolated' parts. This makes trouble for Lewis's modal realism; but the realist has a way out. First, accept absolute actuality, which is defensible, I argue, on independent grounds. Second, revise the standard analysis of modality: modal operators are 'plural', not 'individual', quantifiers over possible worlds. This solves the problem of island universes and confers three additional benefits: an 'unqualified' principle of compossibility (...)
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  • Abstract objects.Gideon Rosen - 2008 - Stanford Encyclopedia of Philosophy.
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  • Modal fictionalism.Daniel Nolan - 2008 - Stanford Encyclopedia of Philosophy.
    Questions about necessity (or what has to be, or what cannot be otherwise) and possibility (or what can be, or what could be otherwise) are questions about modality. Fictionalism is an approach to theoretical matters in a given area which treats the claims in that area as being in some sense analogous to fictional claims: claims we do not literally accept at face value, but which we nevertheless think serve some useful function. However, despite its name, “Modal Fictionalism” in its (...)
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  • On the structural similarities between worlds and times.Edward N. Zalta - 1987 - Philosophical Studies 51 (2):213-239.
    In the debate about the nature and identity of possible worlds, philosophers have neglected the parallel questions about the nature and identity of moments of time. These are not questions about the structure of time in general, but rather about the internal structure of each individual time. Times and worlds share the following structural similarities: both are maximal with respect to propositions (at every world and time, either p or p is true, for every p); both are consistent; both are (...)
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  • Possible worlds as shifting domains.Takashi Yagisawa - 1992 - Erkenntnis 36 (1):83 - 101.
    Those who object to David Lewis' modal realism express qualms about philosophical respectability of the Lewisian notion of a possible world and its correlate notion of an inhabitant of a possible world. The resulting impression is that these two notions either stand together or fall together. I argue that the Lewisian notion of a possible world is otiose even for a good Lewisian modal realist, and that one can carry out a good Lewisian semantics for modal discourse without Lewisian possible (...)
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  • Indexical belief.Robert C. Stalnaker - 1981 - Synthese 49 (1):129-151.
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  • Concrete possible worlds.Phillip Bricker - 2008 - In Theodore Sider, John Hawthorne & Dean W. Zimmerman (eds.), Contemporary debates in metaphysics. Malden, MA: Blackwell. pp. 111--134.
    In this chapter, I survey what I call Lewisian approaches to modality: approaches that analyze modality in terms of concrete possible worlds and their parts. I take the following four theses to be characteristic of Lewisian approaches to modality. (1) There is no primitive modality. (2) There exists a plurality of concrete possible worlds. (3) Actuality is an indexical concept. (4) Modality de re is to be analyzed in terms of counterparts, not transworld identity. After an introductory section in which (...)
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  • David Lewis: On the Plurality of Worlds.Phillip Bricker - 2006 - In John Shand (ed.), Central Works of Philosophy, Vol. 5: The Twentieth Century: Quine and After. Acumen Publishing. pp. 246-267.
    David Lewis's book 'On the Plurality of Worlds' mounts an extended defense of the thesis of modal realism, that the world we inhabit the entire cosmos of which we are a part is but one of a vast plurality of worlds, or cosmoi, all causally and spatiotemporally isolated from one another. The purpose of this article is to provide an accessible summary of the main positions and arguments in Lewis's book.
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  • Synthetic apriority.Yakir Levin - 1995 - Erkenntnis 43 (2):137 - 150.
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  • Determinism, indeterminism and the flow of time.Miloš Arsenijević - 2002 - Erkenntnis 56 (2):123 - 150.
    A set of axioms implicitly defining the standard, though not instant-based but interval-based, time topology is used as a basis to build a temporal modal logic of events. The whole apparatus contains neither past, present, and future operators nor indexicals, but only B-series relations and modal operators interpreted in the standard way. Determinism and indeterminism are then introduced into the logic of events via corresponding axioms. It is shown that, if determinism and indeterminism are understood in accordance with their core (...)
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  • Twenty-five basic theorems in situation and world theory.Edward N. Zalta - 1993 - Journal of Philosophical Logic 22 (4):385-428.
    The foregoing set of theorems forms an effective foundation for the theory of situations and worlds. All twenty-five theorems seem to be basic, reasonable principles that structure the domains of properties, relations, states of affairs, situations, and worlds in true and philosophically interesting ways. They resolve 15 of the 19 choice points defined in Barwise (1989) (see Notes 22, 27, 31, 32, 35, 36, 39, 43, and 45). Moreover, important axioms and principles stipulated by situation theorists are derived (see Notes (...)
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  • Approximate truth and dynamical theories.Peter Smith - 1998 - British Journal for the Philosophy of Science 49 (2):253-277.
    Arguably, there is no substantial, general answer to the question of what makes for the approximate truth of theories. But in one class of cases, the issue seems simply resolved. A wide class of applied dynamical theories can be treated as two-component theories—one component specifying a certain kind of abstract geometrical structure, the other giving empirical application to this structure by claiming that it replicates, subject to arbitrary scaling for units etc., the geometric structure to be found in some real-world (...)
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  • The ersatz pluriverse.Theodore Sider - 2002 - Journal of Philosophy 99 (6):279-315.
    While many are impressed with the utility of possible worlds in linguistics and philosophy, few can accept the modal realism of David Lewis, who regards possible worlds as sui generis entities of a kind with the concrete world we inhabit.1 Not all uses of possible worlds require exotic ontology. Consider, for instance, the use of Kripke models to establish formal results in modal logic. These models contain sets often regarded for heuristic reasons as sets of “possible worlds”. But the “worlds” (...)
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  • Presentism and ontological commitment.Theodore Sider - 1999 - Journal of Philosophy 96 (7):325-347.
    Presentism is the doctrine that only the present is real. Since ordinary talk and thought are full of quantification over non-present objects, presentists are in a familiar predicament: in their unreflective moments they apparently commit themselves to far more than their ontological scruples allow. A familiar response is to begin a project of paraphrase. Truths appearing to quantify over problematic entities are shown, on analysis, to not involve quantification over those entities after all. But I think that we might be (...)
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  • The Logic of What Might Have Been.Nathan Salmon - 1989 - Philosophical Review 98 (1):3-34.
    The dogma that the propositional logic of metaphysical modality is S5 is rebutted. The author exposes fallacies in standard arguments supporting S5, arguing that propositional metaphysical modal logic is weaker even than both S4 and B, and is instead the minimal and weak metaphysical-modal logic T.
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  • Axiological actualism.Josh Parsons - 2002 - Australasian Journal of Philosophy 80 (2):137 – 147.
    This intuition may be contrasted with the incompatible intuitions that might support, say, average utilitarianism. According to average utilitarianism we should bring about that outcome which has the highest average utility. That someone would have a higher than average level of utility is, therefore, ceteris paribus a reason to act so that that person exists. Because of this, the basic intuition is a reason for rejecting average utilitarianism.
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  • Two modal–isms: Fictionalism and ersatzism.Berit Brogaard - 2006 - Philosophical Perspectives 20 (1):77–94.
    It is sometimes said that no living philosopher is a genuine modal realist. This is no doubt an exaggeration. But at least this much is true: while we all partake of possible world talk when philosophizing, most of us regard this talk as incurring no commitment to a plurality of concrete worlds.
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  • Absolute Actuality and the Plurality of Worlds.Phillip Bricker - 2006 - Philosophical Perspectives 20 (1):41–76.
    According to David Lewis, a realist about possible worlds must hold that actuality is relative: the worlds are ontologically all on a par; the actual and the merely possible differ, not absolutely, but in how they relate to us. Call this 'Lewisian realism'. The alternative, 'Leibnizian realism', holds that actuality is an absolute property that marks a distinction in ontological status. Lewis presents two arguments against Leibnizian realism. First, he argues that the Leibnizian realist cannot account for the contingency of (...)
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  • From Metaphysics to Ethics: A Defence of Conceptual Analysis.Frank Jackson - 1998 - New York: Oxford University Press.
    Frank Jackson champions the cause of conceptual analysis as central to philosophical inquiry. In recent years conceptual analysis has been undervalued and widely misunderstood, suggests Jackson. He argues that such analysis is mistakenly clouded in mystery, preventing a whole range of important questions from being productively addressed. He anchors his argument in discussions of specific philosophical issues, starting with the metaphysical doctrine of physicalism and moving on, via free will, meaning, personal identity, motion, and change, to ethics and the philosophy (...)
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  • Escenarios contrafácticos. Una reflexión sobre la Teoría institucional del arte.Adrià Harillo Pla - 2024 - Perseitas 12:273-285.
    Siguiendo la definición de Osvaldo Pessoa Jr., un “escenario contrafáctico” sería “una situación posible que no se realizó, como una posibilidad futura en algún instante del pasado”. Este concepto no es nuevo. De hecho, tiene una presencia significativa en campos como la filosofía analítica, la economía, las ciencias experimentales o la psicología. La pretensión de este texto es presentar, mediante el rigor teórico, conceptual, y el método inductivo, una reflexión no derivada de investigación. Esta reflexión es la importancia de la (...)
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  • Idle Questions.Jens Kipper, Alexander W. Kocurek & Zeynep Soysal - 2024 - Journal of Philosophy.
    In light of the problem of logical omniscience, some scholars have argued that belief is question-sensitive: agents don't simply believe propositions but rather believe answers to questions. Hoek (2022) has recently developed a version of this approach on which a belief state is a "web" of questions and answers. Here, we present several challenges to Hoek's question-sensitive account of belief. First, Hoek's account is prone to very similar logical omniscience problems as those he claims to address. Second, the link between (...)
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  • A Hyperintensional Logic of Non-prime Evidence.Pietro Vigiani - 2024 - Journal of Philosophical Logic 53 (3):761-788.
    We present a logic of evidence that reduces agents’ epistemic idealisations by combining classical propositional logic with substructural modal logic for formulas in the scope of epistemic modalities. To this aim, we provide a neighborhood semantics of evidence, which provides a modal extension of Fine’s semantics for relevant propositional logic. Possible worlds semantics for classical propositional logic is then obtained by defining the set of possible worlds as a special subset of information states in Fine’s semantics. Finally, we prove that (...)
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  • Against S5: Impossible Worlds in the Logic of What Might Have Been.Nathan Salmon - manuscript
    The dogma that the propositional logic of metaphysical modality is S5 is rebutted in related installments (previously published and unpublished essays).
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  • Mathematical Modality: An Investigation in Higher-order Logic.Andrew Bacon - 2024 - Journal of Philosophical Logic 53 (1):131-179.
    An increasing amount of contemporary philosophy of mathematics posits, and theorizes in terms of special kinds of mathematical modality. The goal of this paper is to bring recent work on higher-order metaphysics to bear on the investigation of these modalities. The main focus of the paper will be views that posit mathematical contingency or indeterminacy about statements that concern the ‘width’ of the set theoretic universe, such as Cantor’s continuum hypothesis. Within a higher-order framework I show that contingency about the (...)
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  • Possible Worlds as Propositions.Daniel Deasy - forthcoming - Philosophical Quarterly.
    Realists about possible worlds typically identify possible worlds with abstract objects, such as propositions or properties. However, they face a significant objection due to Lewis (1986), to the effect that there is no way to explain how possible worlds-as-abstract objects represent possibilities. In this paper, I describe a response to this objection on behalf of realists. The response is to identify possible worlds with propositions, but to deny that propositions are abstract objects, or indeed objects at all. Instead, I argue (...)
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  • The Epistemological Subject(s) of Mathematics.Silvia De Toffoli - 2024 - In Bharath Sriraman (ed.), Handbook of the History and Philosophy of Mathematical Practice. Cham: Springer. pp. 1-27.
    Paying attention to the inner workings of mathematicians has led to a proliferation of new themes in the philosophy of mathematics. Several of these have to do with epistemology. Philosophers of mathematical practice, however, have not (yet) systematically engaged with general (analytic) epistemology. To be sure, there are some exceptions, but they are few and far between. In this chapter, I offer an explanation of why this might be the case and show how the situation could be remedied. I contend (...)
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  • Introduction to the Routledge Handbook of Propositions.Adam Russell Murray & Chris Tillman - 2022 - In Chris Tillman & Adam Murray (eds.), The Routledge Handbook of Propositions. Routledge.
    Provides a comprehensive overview and introduction to the Routledge Handbook of Propositions.
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  • مطالعۀ تطبیقی جهان‌های موازی فیزیک و جهان‌های ممکن دیوید لوئیس.Maryam Parvizi & Ashouri Kisomi Mohammad Ali - 2021 - Wisodom and Philosophy 17 (67):39-62.
    در نگاه نخست به نظر می‌رسد می‌توان شباهت‌هایی بین جهان‌های ممکن مورد نظر لوئیس و نظریۀ جهان‌های موازی فیزیک یافت. هر دو این نظریات به امکان وجود جهان‌هایی بیش از جهانی که در آن زندگی می‌کنیم، اشاره دارند. پس از رسالۀ اورت، توجه فیزیک‌دانان به چندجهانی و جهان‌های موازی جلب شد. اکنون جهان‌های موازی یکی از نظریه‌های مورد توجه دانشمندان و پژوهشگران حوزۀ فیزیک است. دیوید لوئیس با تکیه بر فیزیکالیسم و رئالیسم موجهاتی از جمله طرفداران نظریۀ جهان‌های ممکن است. (...)
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  • Essence and Thisness.Sungil Han - 2023 - In Dean Zimmerman & Karen Bennett (eds.), Oxford Studies in Metaphysics Vol. 13. Oxford University Press.
    The project of grounding necessity in essence often goes together with the model of essence that assimilates the constitutive essence of an object to the definition of it. The paper argues that if the grounding project is to succeed, the definitional model must be questioned. Like any object whatever, a concrete individual is necessarily identical to that individual. It is argued that this necessity can have an essential ground only if the primitive identity property of it or its thisness is (...)
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  • Introduction to the Synthese Topical Collection 'Modal Modeling in Science: Modal Epistemology meets Philosophy of Science’.Ylwa Sjölin Wirling & Till Grüne-Yanoff - 2023 - Synthese 201 (6):1-13.
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  • Modalité et changement: δύναμις et cinétique aristotélicienne.Marion Florian - 2023 - Dissertation, Université Catholique de Louvain
    The present PhD dissertation aims to examine the relation between modality and change in Aristotle’s metaphysics. -/- On the one hand, Aristotle supports his modal realism (i.e., worldly objects have modal properties - potentialities and essences - that ground the ascriptions of possibility and necessity) by arguing that the rejection of modal realism makes change inexplicable, or, worse, banishes it from the realm of reality. On the other hand, the Stagirite analyses processes by means of modal notions (‘change is the (...)
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  • Informational Monism: A Phenomenological Perspective on the Nature of Information.Igor Ševo - manuscript
    Although a substantial number of papers is published on the topic of consciousness, there is still little consensus on what its nature is and how the physical and phenomenal worlds are connected. Most published research establishes a causal relation between the brain and the mind, but it lacks a cogent theory of how this relation comes to be. In contrast, this paper uses a set of thought experiments grounded in quantum information theory to derive a framework for resolving the hard (...)
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  • Lying versus misleading, with language and pictures: the adverbial account.Manuel García-Carpintero - 2023 - Linguistics and Philosophy 46 (3):509-532.
    We intuitively make a distinction between _lying_ and _misleading_. On the explanation of this phenomenon favored here—the _adverbial_ account—the distinction tracks whether the content and its truth-committing force are literally conveyed. On an alternative _commitment_ account, the difference between lying and misleading is predicated instead on the strength of assertoric commitment. One lies when one presents with full assertoric commitment what one believes to be false; one merely misleads when one presents it without full assertoric commitment, by merely hinting or (...)
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  • Probabilities of conditionals: Updating Adams.Ivano Ciardelli & Adrian Ommundsen - 2024 - Noûs 58 (1):26-53.
    The problem of probabilities of conditionals is one of the long-standing puzzles in philosophy of language. We defend and update Adams' solution to the puzzle: the probability of an epistemic conditional is not the probability of a proposition, but a probability under a supposition. -/- Close inspection of how a triviality result unfolds in a concrete scenario does not provide counterexamples to the view that probabilities of conditionals are conditional probabilities: instead, it supports the conclusion that probabilities of conditionals violate (...)
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  • Expanding logical space; making room for Islamic theological contradictions.Abbas Ahsan - forthcoming - Journal of Applied Non-Classical Logics.
    Islamic theological contradictions are metaphysical contradictions as opposed to logical and semantic ones. I shall demonstrate that if these theological contradictions are tolerable on the theoretical account of metaphysical dialetheism, then logical space, despite being the space of all possibilities, does not accommodate them in virtue of Chalmers’s ‘deep epistemic possibility’. To resolve this issue, I offer a recalibration of the modal concept of possibility. Doing so would redraw a demarcation between what is possible and what is not. Consequently, we (...)
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  • Causal effects and counterfactual conditionals: contrasting Rubin, Lewis and Pearl.Keith A. Markus - 2021 - Economics and Philosophy 37 (3):441-461.
    Rubin and Pearl offered approaches to causal effect estimation and Lewis and Pearl offered theories of counterfactual conditionals. Arguments offered by Pearl and his collaborators support a weak form of equivalence such that notation from the rival theory can be re-purposed to express Pearl’s theory in a way that is equivalent to Pearl’s theory expressed in its native notation. Nonetheless, the many fundamental differences between the theories rule out any stronger form of equivalence. A renewed emphasis on comparative research can (...)
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  • The Logic of Hyperlogic. Part B: Extensions and Restrictions.Alexander W. Kocurek - 2022 - Review of Symbolic Logic:1-28.
    This is the second part of a two-part series on the logic of hyperlogic, a formal system for regimenting metalogical claims in the object language (even within embedded environments). Part A provided a minimal logic for hyperlogic that is sound and complete over the class of all models. In this part, we extend these completeness results to stronger logics that are sound and complete over restricted classes of models. We also investigate the logic of hyperlogic when the language is enriched (...)
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  • The Alethic Platitudes, Deflationism, and Adverbial Quantification.Bradley Armour-Garb & James A. Woodbridge - 2023 - Philosophical Quarterly 73 (2):323-345.
    Alethic pluralists often claim that accommodating certain alethic platitudes motivates rejecting deflationism in favour of a pluralist inflationism about truth. Deflationists claim that the logical role of the truth predicate, viz providing something equivalent to variables for sentence-in-use positions and quantifiers governing them, is sufficient to account for the appeal to truth in the alethic platitudes. Surprisingly, however, most deflationists face an insufficiently acknowledged problem with respect to explaining how this mode of generalizing works. The standard substitutional or higher-order interpretations (...)
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  • A Referential Theory of Truth and Falsity.İlhan İnan - 2022 - New York, NY, USA: Routledge.
    This book proposes a novel theory of truth and falsity. It argues that truth is a form of reference and falsity is a form of reference failure. -/- Most of the philosophical literature on truth concentrates on certain ontological and epistemic problems. This book focuses instead on language. By utilizing the Fregean idea that sentences are singular referring expressions, the author develops novel connections between the philosophical study of truth and falsity and the huge literature in in the philosophy of (...)
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  • The Logic of Hyperlogic. Part A: Foundations.Alexander W. Kocurek - 2024 - Review of Symbolic Logic 17 (1):244-271.
    Hyperlogic is a hyperintensional system designed to regiment metalogical claims (e.g., “Intuitionistic logic is correct” or “The law of excluded middle holds”) into the object language, including within embedded environments such as attitude reports and counterfactuals. This paper is the first of a two-part series exploring the logic of hyperlogic. This part presents a minimal logic of hyperlogic and proves its completeness. It consists of two interdefined axiomatic systems: one for classical consequence (truth preservation under a classical interpretation of the (...)
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  • On Unexplained (Modal) Patterns.Harjit Bhogal - 2022 - Erkenntnis:1-18.
    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 (...)
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  • A Metaphysical Puzzle for Neo‐Fregean Abstractionists.Thomas Donaldson - 2023 - Theoria 89 (3):266-279.
    We discuss abstraction principles in the context of modal and temporal logic. It is argued that abstractionism conflicts with both serious presentism and serious actualism.
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  • Against modal dualism.Dirk Franken - 2021 - European Journal of Philosophy 30 (2):608-622.
    Modal dualism is the claim that there is a space of epistemically possible worlds that exceeds the space of metaphysically possible worlds. In the present paper, I argue that modal dualism is false. I do so via an argument that differs from most previous arguments against modal dualism in that it does not rely on controversial semantic or epistemological assumptions like descriptivism, internalism or modal rationalism. The point of my argument is, instead, that modal dualism is internally inconsistent because it (...)
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  • Introspective knowledge by acquaintance.Anna Giustina - 2022 - Synthese 200 (2):1-23.
    Introspective knowledge by acquaintance is knowledge we have by being directly aware of our phenomenally conscious states. In this paper, I argue that introspective knowledge by acquaintance is a sui generis kind of knowledge: it is irreducible to any sort of propositional knowledge and is wholly constituted by a relationship of introspective acquaintance. My main argument is that this is the best explanation of some epistemic facts about phenomenal consciousness and introspection. In particular, it best explains the epistemic asymmetry between (...)
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  • Formal Ontology and Conceptual Realism.Nino Barnabas Cocchiarella - 2007 - Dordrecht, Netherland: Springer.
    Theories about the ontological structure of the world have generally been described in informal, intuitive terms. This book offers an account of the general features and methodology of formal ontology. The book defends conceptual realism as the best system to adopt based on a logic of natural kinds. By formally reconstructing an intuitive, informal ontological scheme as a formal ontology we can better determine the consistency and adequacy of that scheme.
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  • Proof-Theoretic Semantics and Inquisitive Logic.Will Stafford - 2021 - Journal of Philosophical Logic 50 (5):1199-1229.
    Prawitz conjectured that proof-theoretic validity offers a semantics for intuitionistic logic. This conjecture has recently been proven false by Piecha and Schroeder-Heister. This article resolves one of the questions left open by this recent result by showing the extensional alignment of proof-theoretic validity and general inquisitive logic. General inquisitive logic is a generalisation of inquisitive semantics, a uniform semantics for questions and assertions. The paper further defines a notion of quasi-proof-theoretic validity by restricting proof-theoretic validity to allow double negation elimination (...)
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  • Ostrich Actualism.Craig Warmke - 2021 - In Sara Bernstein & Tyron Goldschmidt (eds.), Non-Being: New Essays on the Metaphysics of Nonexistence. Oxford: Oxford University Press. pp. 205-225.
    In On What Matters, Derek Parfit enters the debate between actualists and possibilists. This debate concerns mere possibilia, possible but non-actual things such as golden mountains and talking donkeys. Roughly, possibilism says that there are such things, and actualism says that there are not. Parfit not only argues for possibilism but also argues that some self-proclaimed actualists are, in fact, unwitting possibilists. -/- I argue that although Parfit’s arguments do not fully succeed, they do highlight a tension within the frameworks (...)
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  • What Cancer Is.J. James Frost - unknown
    The problem of cancer is examined from the metaphysical standpoint of essence and ground. An essentialist definition of cancer is assumed that would be valid in all possible worlds in which cancer could logically exist. The grounds of cancer are then examined and elucidated. Two grounding cancer properties are identified and discussed: symmetry- breaking and computational intelligence. Each examination leads to concrete conclusions for novel therapeutic approaches and a more fundamental understanding of what cancer is at bottom. Other possible cancer (...)
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  • Problemas de Metafísica Analítica / Problems in Analytical Metaphysics.Guido Imaguire & Rodrigo Reis Lastra Cid (eds.) - 2020 - Pelotas: Editora da UFPel / UFPel Publisher.
    O desenvolvimento da filosofia acadêmica no Brasil é direcionada, entre vários fatores, pelas investigações dos diversos Grupos de Trabalho (GTs) da Associação Nacional de Pós-Graduação em Filosofia (ANPOF). Esses GTs se dividem de acordo com a temática investigada. O GT de Metafísica Analítica é relativamente novo e ainda tem poucos membros, mas os temas nele trabalhados são variados e todos centrais no debate metafísico contemporâneo internacional. A sua investigação se caracteriza pelo rigor lógico e conceitual com o qual aborda esses (...)
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