In this article, we discuss the notion of merely confused supposition as it arose in the medieval theory of suppositio personalis. The context of our analysis is our formalization of William of Ockham's theory of supposition sketched in Mind 86 (1977), 109-13. The present paper is, however, self-contained, although we assume a basic acquaintance with supposition theory. The detailed aims of the paper are: to look at the tasks that supposition theory took on itself and to use our formalization to (...) relate them to more modern ideas; to explain the notion of merely confused supposition and to defend it against certain criticisms; and to discuss two issues closely related to the idea of merely confused supposition which we could not broach in a shorter article: the mode of supposition of terms in intensional contexts, and the possible existence of a fourth mode, often called suppositio copulatim. (shrink)

A counterpossible conditional is a counterfactual with an impossible antecedent. Common sense delivers the view that some such conditionals are true, and some are false. In recent publications, Timothy Williamson has defended the view that all are true. In this paper we defend the common sense view against Williamson’s objections.

In this paper we reply to arguments of Kroon (“Characterization and Existence in Modal Meinongianism”. Grazer Philosophische Studien 86, 23–34) to the effect that Modal Meinongianism cannot do justice to Meinongian claims such as that the golden mountain is golden, and that it does not exist.

Nearly a decade has past since Grove gave a semantics for the AGM postulates. The semantics, called sphere semantics, provided a new perspective of the area of study, and has been widely used in the context of theory or belief change. However, the soundness proof that Grove gives in his paper contains an error. In this note, we will point this out and give two ways of repairing it.

Graham Priest's book In Contradiction is a bold defense of the existence of true contradictions. Although Priest's case is impressive, and many of his arguments are correct, his approach is not the only one allowing for true contradictions. As against Priest's, there is at least one contradictorialist approach which establishes a link between true contradictions and degrees of truth. All in all, such an alternative is more conservative, closer to mainstream analytical philosophy. The two approaches differ as regards the (...) floodgate problem. Priest espouses a confinement policy banning contradictions except in a few special domains, particularly those of pure semantics and set-theory , whereas the alternative approach admits two negations -- natural or weak negation and strong negation, the latter being classical; accordingly, the alternative approach prohibits any contradiction involving strong negation, thus providing a syntactic test of what contradictions have to be rejected. (shrink)

We reply to various arguments by Otavio Bueno and Edward Zalta (‘Object Theory and Modal Meinongianism’) against Modal Meinongianism, including that it presupposes, but cannot maintain, a unique denotation for names of fictional characters, and that it is not generalizable to higher-order objects. We individuate the crucial difference between Modal Meinongianism and Object Theory in the former’s resorting to an apparatus of worlds, possible and impossible, for the representational purposes for which the latter resorts to a distinction between two kinds (...) of predication, exemplification and encoding. We show that encoding has fewer forerunners in the history of philosophy than Bueno and Zalta want, and that there’s a reason why the notion has been found baffling by some. (shrink)

Per il dialeteismo ci sono contraddizioni vere. Questa concezione filosofica ha assunto una forma chiara e definita a partire dal lavoro del filosofo e logico Graham Priest – uno dei suoi padri fondatori, nonché uno dei suoi più strenui difensori. Questo libro intende portare il dialeteismo all’attenzione di un ampio pubblico, che non sia solo quello degli addetti ai lavori. Il volume è suddiviso in due parti. La prima include le cinque lezioni su "Dialeteismo e storia della filosofia" tenute (...) da Priest e Filippo Casati a Padova nel 2016, in occasione del Corso di Eccellenza per il dottorato in filosofia dell’Università di Padova. La seconda contiene quattro contributi sul dialeteismo di autori italiani. (shrink)

La noción de totalidad ha generado, a partir de Platón, una serie de aporías internas al pensamiento que reaparecen en la historia moderna, desde la teoría de conjuntos de Cantor hasta los teoremas de incompletitud de Gödel. Graham Priest ha formalizado este problema con el esquema de inclusión, Ω = {x : ϕ(x)} y ψ(Ω). Este estudio muestra que la axiomática del acontecimiento de Alain Badiou, desarrollada en El ser y el acontecimiento y basada en la teoría de conjuntos, (...) desemboca en una ruptura con el Todo ontológico en Lógica de los mundos, reproduciendo una estructura paradójica. Aunque Badiou afirma que “el uno no es” y que el ser es una multiplicidad consistente, su noción de acontecimiento depende de una nominación de sí mismo que lo incluye y lo excluye simultáneamente, presentándose como una multiplicidad inconsistente. La inexistencia del Todo badiouano satisface el esquema de inclusión priestiano, perteneciendo a la serie de paradojas de la autorreferencia que provienen de una fisura de la trascendencia en cualquier filosofía de la inmanencia. (shrink)

Get used to it: paradox and contradiction are inherent in human experience. Australian philosopher of logic Graham Priest takes us on a historical tour of paradox and limitation in human conception, expression, cognition, and calculation. Along the way we meet the many, mostly western, philosophers who've struggled with expressing the inexpressible and conceiving the inconceivable. Priest arrives at a general schema for representing these limit encounters from the standpoint of contemporary logic.

Graham Priest, ampiamente considerato una figura di tutto rilievo nel panorama filosofico contemporaneo, è conosciuto prevalentemente per i suoi contributi nel campo delle logiche non-classiche, e per essere uno dei fondatori della controversa tesi filosofica denominata dialeteismo. Non sorprende che, come per molti degli autori che vengono comunemente inseriti nella tradizione analitica, due delle aree in cui il suo pensiero è stato più fecondo siano la logica e la metafisica. Ciò che sorprende, invece, è la sua capacità di usare (...) le teorie formali e le tesi metafisiche da lui stesso concepite come via di accesso per terreni filosofici normalmente considerati distanti da quello anglosassone. In particolare, sono numerose le occasioni in cui l’attenzione di Priest si è rivolta ad Oriente, e più nello specifico al Buddismo. The Fifth Corner of Four, il suo ultimo libro, può essere considerato a buon diritto la manifestazione più evidente di questo grande e perdurante interesse. (shrink)

In this paper, we look at applying the techniques from analyzing superintuitionistic logics to extensions of the cointuitionistic Priest-da Costa logic daC (introduced by Graham Priest as “da Costa logic”). The relationship between the superintuitionistic axioms- definable in daC- and extensions of Priest-da Costa logic (sdc-logics) is analyzed and applied to exploring the gap between the maximal si-logic SmL and classical logic in the class of sdc-logics. A sequence of strengthenings of Priest-da Costa logic is examined and employed to (...) pinpoint the maximal non-classical extension of both daC and Heyting-Brouwer logic HB . Finally, the relationship between daC and Logics of Formal Inconsistency is examined. (shrink)

Graham Priest has recently proposed a solution to the problem of the One and the Many which involves inconsistent objects and a non-transitive identity relation. We show that his solution entails either that the object everything is identical with the object nothing or that they are mutual parts; depending on whether Priest goes for an extensional or a non-extensional mereology.

Graham Greene's novels are often read with no reference to his Roman Catholic Faith. Particularly, in India there is little knowledge among both students and scholars about the primacy and the nature of the Roman Catholic Faith. They miss the point that the Roman Faith is a deeply Mysterious Faith. The term "Mystery" is used here in the Catholic sense of that Faith's 'Mysteries'. The essay and the long endnotes try to rectify the errors which creep in when Greene (...) is decontextualized from his Faith by logical positivists. In the name of the 'death of the author' religious relativists contaminated with the heresies of modernism misinterpret Greene. 'Heresies of Modernism' will be alien to those whose academic limits do not go beyond staid woke-seminars. The essay is discursive in nature, but on purpose. It sees Greene's works through the lens of the Suffering Servant and Paul's Hymn to Love. It has to be kept in mind that Greene is a Roman Catholic writer who knew his Church's teachings well. Christianity is not a homogenous term. "Religious" in the essay often means those who are lead consecrated lives within the Catholic Church as distinct from diocesan clergy. (shrink)

Markus Gabriel's pluralism and Graham Priest's monism can be considered new forms of skepticism in contemporary philosophy. Gabriel considers 'emptiness' and Priest 'nothingness' as safe havens for logic and philosophy. Similarly, traditional skeptics also considered nothing secure. Furthermore, we can also observe in this book that both Priest and Gabriel present quite eloquent theories, even though they still lack more substantial proofs, much like many important theories in philosophy, such as Leibniz's monadology.

Part of a book symposium on Graham Priest's Towards Non-Being.

In this study, I reconstruct and compare Alain Badiou’s Being and Event (2005) and Graham Priest’s One (2014), arguing that the ontologies pursued within the two texts are intriguingly analogous in a number of ways. Both Badiou and Priest are committed to thinking through classically ontological problems without denying the validity of the paradoxes they raise; both regard Plato’s Parmenides as an early and formative account of these paradoxes; both establish conclusions to the effect that unity – or “oneness” (...) – is indeed a contradictory phenomenon; and both, as a corollary of this conclusion, develop frameworks which confer ontological prominence upon "the void" and "emptiness" respectively, thereby arriving at what appears to be a shared ontological nihilism. In this comparative study, I not only enquire whether the frameworks adopted by Badiou and Priest really do lead to nihilist conclusions, but also attempt to clearly outline their trajectories of thought for the benefit of those who might be tempted to dismiss their seemingly outlandish theses out of hand. (shrink)

(April 2019) UNBELIEVABLE similarities between some articles from a book edited by Bliss and Priest (2018) and my ideas (2002-208) -/- (2018) Reality and its Structure - Essays in Fundamentality, Ricki Bliss and Graham Priest (eds.), Oxford Univ Press -/- The content of this paper is about the following articles from the above book: -/- Gabriel Oak Rabin (2018) Grounding Orthodoxy and the Layered Conception Daniel Nolan (2018) Cosmic Loops Naomi Thompson (2018) Metaphysical Interdependence, Epistemic Coherentism, and Tuomas E. (...) Tahko (2018) Holistic Explanation Fundamentality and Ontological Minimality Matteo Morganti (2018) The Structure of Physical Reality Beyond Foundationalism Nathan Wildman (2018) On Shaky Ground? Exploring the Contingent Fundamentality Thesis . (shrink)

This was written for the Archdiocese of Calcutta's mouthpiece, The Herald in 2009 and published there. The audience is chiefly popular and not the usual academic audience both within Catholicism or in the academe in general. This essay makes a case for us in understanding and empathizing with the essential loneliness of the Catholic Religious (as understood by a married Hindu man). Further, literature is shown hear as effective therapy for resisting loneliness and as a therapeutic tool for self-help by (...) Catholic Religious. The author is not in possession of the published article but has been informed that copies of The Herald, Kolkata are kept at Goethals's Library, St. Xavier's College, Kolkata. (shrink)

The subject of my article is the principle of characterization – the most controversial principle of Meinong’s Theory of Objects. The aim of this text is twofold. First of all, I would like to show that Russell’s well-known objection to Meinong’s Theory of Objects can be reformulated against a new modal interpretation of Meinongianism that is presented mostly by Graham Priest. Secondly, I would like to propose a strategy which gives uncontroversial restriction to the principle of characterization and which (...) allows to avoid Russell’s argument. The strategy is based on the distinction between object- and metalanguage, and it applies to modal Meinongianism as well as to other so-called Meinongian theories. (shrink)

Graham Priest distinguishes between two kinds of Sorites paradoxes: standard Sorites, such as the paradox of the Heap, and non-standard Sorites, such as the Ship of Theseus. The former concerns properties of objects, whereas the latter concerns their identity conditions. Priest notes that the standard Sorites has been solved in fuzzy logic and proposes a logic of fuzzy identity to solve the non-standard Sorites in a similar way. Ideally, a definition of fuzzy identity would satisfy the fuzzy equivalents of (...) the classical principles of identity: it should (i) be a fuzzy equivalence relation and (ii) validate a fuzzy version of the substitutivity of identicals. However, Priest’s definition fails to meet the latter requirement and only applies to a special case of the non-standard Sorites. I suggest an improvement on his logic that overcomes these shortcomings, provides the two Sorites with a unified solution, and also applies to reasoning about vague objects in general. (shrink)

Graham Priest has formulated the minimally inconsistent logic of paradox (MiLP), which is paraconsistent like Priest’s logic of paradox (LP), while staying closer to classical logic. We present logics that stand to (the propositional fragments of) strong Kleene logic (K3) and the logic of first-degree entailment (FDE) as MiLP stands to LP. That is, our logics share the paracomplete and the paraconsistent-cum-paracomplete nature of K3 and FDE, respectively, while keeping these features to a minimum in order to stay closer (...) to classical logic. We give semantic and sequent-calculus formulations of these logics, and we highlight some reasons why these logics may be interesting in their own right. (shrink)

Graham Priest has influentially claimed that the Sorites paradox is an Inclosure paradox, concluding that his favored dialetheic solution to the Inclosure paradoxes should be extended to the Sorites paradox. We argue that, given Priest’s dialetheic solution to the Sorites paradox, the argument purporting to show that that paradox is an Inclosure is unsound, and discuss some issues surrounding this fact.

Graham Priest, in various places, has argued that when you are halfway through walking out of a room, you are both in and not in the room. I argue against this view. ‘In the room’ is open textured and latently ambiguous, admitting of an in-favouring and a not-in-favouring interpretation. Unlike with ordinary ambiguity, where a word or phrase gets used sometimes with one meaning, sometimes with another, a latently ambiguous expression is used with a subtly indeterminate meaning before the (...) latent ambiguity comes to light. This latent ambiguity of ‘in the room’ is not well known because we don’t ordinarily talk about what is the case exactly halfway through walking out of a room. Properly appreciating it neutralizes Priest’s argument. (shrink)

Priest holds anti-exceptionalism about logic. That is, he holds that logic, as a theory, does not have any exceptional status in relation to the theories of empirical sciences. Crucial to Priest’s anti-exceptionalism is the existence of ‘data’ that can force the revision of logical theory. He claims that classical logic is inadequate to the available data and, thus, needs to be revised. But what kind of data can overturn classical logic? Priest claims that the data is our intuitions about the (...) validity of inferences. In order to make sense of this claim, I will appeal to the Madhyamaka Buddhist philosopher Candrakīrti. I will then pose a problem for Priest’s anti-exceptionalism. Finally, I will suggest a way out of the problem for Priest. Whether or not he accepts my solution, I will let him decide. (shrink)

Graham Priest claims that Asian philosophy is going to constitute one of the most important aspects in 21st-century philosophical research. Assuming that this statement is true, it leads to a methodological question whether the dominant comparative and contrastive approaches will be supplanted by a more unifying methodology that works across different philosophical traditions. In this article, I concentrate on the use of empirical evidence from nonphilosophical disciplines, which enjoys popularity among many Western philosophers, and examine the application of this (...) approach to early Chinese philosophy. I specifically focus on Confucian ethics and the study of altruism in experimental psychology. (shrink)

Graham Priest has argued that changes occur at a moment of change in which objects are in a contradictory state, being in both the state changed from and the state changed to. In “Moments of Change,” the current author rejected this model on the grounds that every change would require an infinite number of other changes, and that for similar regress problems, the model is not compatible with the Leibniz Continuity Condition that Priest appeals to in the model’s support. (...) In “Contradiction and the Instant of Change Revisited,” Priest rightly points out in response that any regress can be stopped by allowing that some changes can occur without a moment of change and that there are some exceptions to the lcc in the case of change. It is argued here that while the regress can be stopped by allowing for exceptions to the rules, the more exceptions that must be allowed and the more similar the excepted cases are to cases of supposed contradiction, the less attractive both the contradictory account of change and the lcc should be. Secondly, it is argued that the intuitions that make the contradictory account of change seem appealing are likely to disappear if we adopt an eternalist model of spacetime, which we should do in any case in order to best accommodate the special theory of relativity. In particular, eternalism undermines our intuitions that there must be a moment of change in order for change to occur, that contradictory moments are required to allow for a Laplacian universe, that motion must be intrinsic to an object at a time, and that change obeys the lcc. (shrink)

The goals of this paper are two-fold: I wish to clarify the Aristotelian conception of the law of non-contradiction as a metaphysical rather than a semantic or logical principle, and to defend the truth of the principle in this sense. First I will explain what it in fact means that the law of non-contradiction is a metaphysical principle. The core idea is that the law of non-contradiction is a general principle derived from how things are in the world. For example, (...) there are certain constraints as to what kind of properties an object can have, and especially: some of these properties are mutually exclusive. Given this characterisation, I will advance to examine what kind of challenges the law of non-contradiction faces; the main opponent here is Graham Priest. I will consider these challenges and conclude that they do not threaten the truth of the law of non-contradiction understood as a metaphysical principle. (shrink)

I argue that Graham Priest's story 'Sylvan's Box' has an attractive consistent reading. Priest's hope that this story can be used as an example of a non-trivial 'essentially inconsistent' story is thus threatened. I then make some observations about the role 'Sylvan's Box' might play in a theory of unreliable narrators.

This article critically examines the concept of "Absolute Nothingness" from a rigorous logical-metaphysical perspective. It is argued that Nothingness, as a negation of Being, cannot subsist as a primary, autonomous or positively articulable concept without incurring in a performative contradiction. Based on the thesis that Being is a necessary metaphysical-ontological condition of every proposition (S((T)(φ))), it is demonstrated that every attempt to enunciate absolute Nothingness inevitably converts it into linguistic or conceptual positivity, betraying its own definition. The text critically examines (...) authors such as Heidegger, Hegel, Sartre, Graham Priest, and Alain Badiou, showing that any effort to positivize absolute Nothingness, whether ontologically, logically, or phenomenologically, collapses when it depends on Being itself for its formulation. It is concluded that absolute Nothingness is not ontologically thinkable, logically consistent, or linguistically referenceable, being only a negative limit that demarcates the impossibility of thought outside Being. (shrink)

Impossible worlds are representations of impossible things and impossible happenings. They earn their keep in a semantic or metaphysical theory if they do the right theoretical work for us. As it happens, a worlds-based account provides the best philosophical story about semantic content, knowledge and belief states, cognitive significance and cognitive information, and informative deductive reasoning. A worlds-based story may also provide the best semantics for counterfactuals. But to function well, all these accounts need use of impossible and as well (...) as possible worlds. So what are impossible worlds? Graham Priest claims that any of the usual stories about possible worlds can be told about impossible worlds, too. But far from it. I'll argue that impossible worlds cannot be genuine worlds, of the kind proposed by Lewis, McDaniel or Yagisawa. Nor can they be ersatz worlds on the model proposed by Melia or Sider. Constructing impossible worlds, it turns out, requires novel metaphysical resources. (shrink)

A logic is called 'paraconsistent' if it rejects the rule called 'ex contradictione quodlibet', according to which any conclusion follows from inconsistent premises. While logicians have proposed many technically developed paraconsistent logical systems and contemporary philosophers like Graham Priest have advanced the view that some contradictions can be true, and advocated a paraconsistent logic to deal with them, until recent times these systems have been little understood by philosophers. This book presents a comprehensive overview on paraconsistent logical systems to (...) change this situation. The book includes almost every major author currently working in the field. The papers are on the cutting edge of the literature some of which discuss current debates and others present important new ideas. The editors have avoided papers about technical details of paraconsistent logic, but instead concentrated upon works that discuss more 'big picture' ideas. Different treatments of paradoxes takes centre stage in many of the papers, but also there are several papers on how to interpret paraconistent logic and some on how it can be applied to philosophy of mathematics, the philosophy of language, and metaphysics. (shrink)

Mark Colyvan formulates a puzzle about belief in inconsistent entities. As a scientific realist, Colyvan refers to salient instances of inconsistencies in our best science and demonstrates how an indispensability argument may justify belief in an inconsistent entity. Colyvan’s indispensability argument presents a two-horned dilemma: either scientific realists are committed to the possibility of warranted belief in inconsistent objects, or we have a reductio ad absurdum, bringing realism into a crisis. Firstly, this paper follows Graham Priest by opposing the (...) received characterisation of inconsistent belief as a kind of epistemic hell. Secondly, I challenge the Quinean naturalism that underpins Colyvan’s indispensability argument. Then, I reformulate Colyvan’s argument with a fallible naturalism, better equipped to account for certain problem candidates for inconsistent entities. Finally, I contend that—even if indispensable—an inconsistent entity poses no problem for the scientific realist, who can have justified belief in inconsistent entities. (shrink)

The fourteen papers in this collection offer a variety of original contributions to the epistemology of modality. In seeking to explain how we might account for our knowledge of possibility and necessity, they raise some novel questions, develop some unfamiliar theoretical perspectives, and make some intriguing proposals. Collectively, they advance our understanding of the field. In Part I of this Introduction, I give some general background about the contemporary literature in the area, by sketching a timeline of the main tendencies (...) of the past twenty-five years or so, up to the present debates. Next, I focus on four features that largely characterize the latest literature, and the papers in the present collection in particular: (i) an endorsement of the importance of essentialism; (ii) a shift to a “metaphysics-first” approach to modal epistemology; (iii) a focus on metaphysical modality as opposed to other kinds of modality; and (iv) a preference for non-uniform modal epistemology. In Part II, I present the individual papers in the volume. These are organized around the following four chapters, based on their topic: (A) Skepticism & Deflationism; (B) Essentialism; (C) Non-Essentialist Accounts; (D) Applications. -/- LIST OF CONTRIBUTORS: Francesco Berto; Stephen Biggs & Jessica Wilson; Justin Clark-Doane; Philip Goff; Bob Hale; Frank Jackson; Mark Jago; Boris Kment; Antonella Mallozzi; Graham Priest; Gabriel Rabin; Amie Thomasson; Anand Vaidya & Michael Wallner; Jennifer Wang. -/- The volume is dedicated to the memory of Bob Hale. -/- . (shrink)

Philosophical dialetheism, whose main exponent is Graham Priest, claims that some contradictions hold, are true, and it is rational to accept and assert them. Such a position is naturally portrayed as a challenge to the Law of Non-Contradiction (LNC). But all the classic formulations of the LNC are, in a sense, not questioned by a typical dialetheist, since she is (cheerfully) required to accept them by her own theory. The goal of this paper is to develop a formulation of (...) the Law which appears to be unquestionable, in the sense that the Priestian dialetheist is committed to accept it without also accepting something inconsistent with it, on pain of trivialism—that is to say, on pain of lapsing into the position according to which everything is the case. This will be achieved via (a) a discussion of Priest's dialetheic treatment of the notions of rejection and denial; and (b) the characterization of a negation via the primitive intuition of content exclusion. Such a result will not constitute a cheap victory for the friends of consistency. We may just learn that different things have been historically conflated under the label of 'Law of Non-Contradiction'; that dialetheists rightly attack some formulations of the Law, and orthodox logicians and philosophers have been mistaken in assimilating them to the indisputable one. (shrink)

Este artigo examina criticamente o conceito de “Nada absoluto” a partir de uma perspectiva lógico-metafísica rigorosa. Defende-se que o Nada, enquanto negação do Ser, não pode subsistir como conceito primário, autônomo ou positivamente articulável sem incorrer em contradição performativa. Com base na tese de que o Ser é condição metafísico-ontológica necessária de toda proposição (S(Ⓣ(φ))), demonstra-se que toda tentativa de enunciar o Nada absoluto o converte, inevitavelmente, em positividade linguística ou conceitual, traindo sua própria definição. O texto examina criticamente autores (...) como Heidegger, Hegel, Sartre, Graham Priest e Alain Badiou, mostrando que qualquer esforço para positivar o Nada absoluto, seja ontologicamente, logicamente ou fenomenologicamente, colapsa ao depender do próprio Ser para sua formulação. Conclui- se que o Nada absoluto não é ontologicamente pensável, logicamente consistente, nem linguisticamente referenciável, sendo apenas um limite negativo que demarca a impossibilidade do pensamento fora do Ser. (shrink)

In his In Contradiction (1987), Priest levelled three powerful arguments against the received Russellian view of change and motion. He argued that his preferred paraconsistent theory of change, the Hegelian account, is immune from these objections. Here I argue that these three arguments are sound, but that the Hegelian account falls pray to them too. I conclude, however, that the Hegelian account is in a better position to tackle these challenges.

In order to reason in a non-trivializing way with contradictions, para- consistent logics reject some classically valid inferences. As a way of re- covering some of these inferences, Graham Priest ([Priest, 1991]) proposed to nonmonotonically strengthen the Logic of Paradox by allowing the se- lection of “less inconsistent” models via a comparison of their respective inconsistent parts. This move recaptures a good portion of classical logic in that it does not block, e.g., disjunctive syllogism, unless it is applied to (...) contradictory assumptions. In Priest’s approach the inconsistent parts of models are compared in an extensional way by considering their inconsis- tent objects. This distinguishes his system from the standard format of (inconsistency-)adaptive logics pioneered by Diderik Batens, according to which (atomic) contradictions validated in models form the basis of their comparison. A well-known problem for Priest’s extensional approach is its lack of the Strong Reassurance property, i.e., for specific settings there may be infinitely descending chains of less and less inconsistent models, thus never reaching a minimally inconsistent model. In this paper, we demonstrate that Strong Reassurance holds for the extensional approach under a cardinality-based comparison of the incon- sistent parts of models. Furthermore, we introduce and investigate the metatheory of the class of first-order nonmonotonic inconsistency-tolerant construct over the extensional or quantitative comparisons of their respec- tive models. Core model-theoretic properties for these logics, such as the Löwenheim-Skolem theorems, along with other nonmonotonic properties, are further studied. (shrink)

The essays collected in this volume are all concerned with the connection between fiction and truth. This question is of utmost importance to metaphysics, philosophy of language, philosophical logic and epistemology, raising in each of these areas and at their intersections a large number of issues related to creation, existence, reference, identity, modality, belief, assertion, imagination, pretense, etc. All these topics and many more are addressed in this collection, which brings together original essays written from various points of view by (...) philosophers of diverse trends. These essays constitute major contributions to the current debates that the connection between truth and fiction continually enlivens, and give a sense of the directions in which research on this question is heading. Contributors: Fred Adams, Frederick Kroon, Robert Howell, Brendan Murday, Terence Parsons, Graham Priest, Erich Rast, Manuel Rebuschi, Marion Renauld, R.M. Sainsbury, Grant Tavinor, Alberto Voltolini. (shrink)

The idea that there is a coherent and morally relevant concept of sexual perversions has been increasingly called into question. In what follows, I will be concerned with two recent attacks on the notion of sexual perversion: those of Graham Priest and Igor Primoratz. Priest’s paper is the deeper of the two. Primoratz goes methodically through various accounts of sexual perversion and finds difficulties in them. This is no small task, of course, but unlike Priest he does not attempt (...) to provide any diagnosis of why any attempt to analyse the concept of sexual perversion must fail. Priest argues that sexual perversion is an “inapplicable concept”: the presuppositions that would allow us to make sense of the notion have been rightly rejected. Without the theoretical backdrop of an Aristotelian moral teleology, we cannot provide a satisfactory account of sexual perversion, for only such a teleological world-view allows us to give some sense to the idea that a sexual practice might be morally wrong because it is unnatural. Priest surveys accounts of perversion that don’t appeal to any idea of unnaturalness and rejects them—rightly I believe. But, Priest argues, Aristotle’s own moral teleology is part and parcel of his wider views about purpose in nature. This natural teleology has been shown to be explanatorily superfluous. Though some sciences still talk of functions, this can be understood in terms of contributions to evolutionary survival. Though there is considerable disagreement about the details of the right account of function, all versions of this scientifically respectable teleology are morally neutral: it would not follow from the fact that homosexual intercourse does nothing to propagate the agents’ genetic material to future generations that it is therefore morally wrong. Here too I think Priest is right. He also considers what he calls “Aristotelian revivalism” in Roger Scruton’s account of sexual perversion. I think Priest sells Aristotelianism short. I have no interest in defending Scruton’s own understanding of the Aristotelian moral framework nor his particular account of sexual perversion. I shall, however, argue that Aristotelian moral philosophy provides a more useful framework for thinking about these issues than Priest implies, and attempt to defend an account of sexual perversion within the context of this framework. (shrink)

There is a strong intuition that for a change to occur, there must be a moment at which the change is taking place. It will be demonstrated that there are no such moments of change, since no state the changing thing could be in at any moment would suffice to make that moment a moment of change. A moment in which the changing thing is simply in the state changed from or the state changed to cannot be the moment of (...) change, since these states are respectively before and after the change; moreover, to select one of these moments over the other as the moment of change would be arbitrary. A moment in which the changing thing is neither in the state changed from nor in the state changed to cannot be the moment of change, since there are changes for which it is impossible for something to be in neither state. Finally, the moment of change cannot be a moment in which the changing thing is in both the state changed from and the state changed to, as suggested by Graham Priest and others. Even if, like proponents of this view, we are willing to accept the contradictions that the account entails, it is demonstrated that on such a model, every change would require an infinite number of other changes, every change would take an infinite amount of time, and some changes would occur without occurring at any time. Further, the model is grossly counterintuitive, with the exact nature of the counterintuitive element depending on what model of time and space one endorses. Finally, it is demonstrated that this model is incompatible with the Leibniz Continuity Condition. (shrink)

According to some critics, Aristotle’s elenctic defence (elenchos, elenchus) of the Law of Non-Contradiction (Metaphysics IV) would be ineffective because it viciously begs the question. After briefly recalling the elenctic refutation of the denier of the Law of Non-Contradiction, I will first focus on Filippo Costantini’s objection to the elenchus, which, in turn, is based on the dialetheic account of negation developed by Graham Priest. Then, I will argue that there is at least one reading of the elenchus that (...) might not be viciously question-begging. In doing so, I will leverage, reinterpret and adjust the distinction between two senses of epistemic dependence, offered by Noah Lemos and originally based on some thoughts about George Edward Moore’s ‘proof of an external world.’ The key point of my counter-objection to recover the elenchus is to use the distinction between a necessary-condition relation between propositions (p only if q) and a grounding relation between facts (the fact that an epistemic agent S believes that p is grounded in the fact that S believes that q), where p and q are the content of S’s beliefs. (shrink)

In his book review of Graham Priest's The Fifth Corner of Four, Mark Siderits, while criticising Priest's philology, suggests that Priest's work is 'of considerable interest' for two reasons. First, 'when two independent traditions use similar methods to work on similar issues, it is always possible that one may have hit on approaches that the other missed'. Second, 'the decentering that can be induced by looking at another tradition may trigger fresh insights, even if those insights are not ones (...) that were actually developed by the tradition marked 'other''. The main task of this paper is to unpack Siderits' thought. By analysing some of Priest's work, I will suggest a decentering that must have taken place in China when Buddhism was 'exported to China in Buddhist shipping containers'. For anyone familiar with the forms of Buddhist philosophy developed in India, various forms of Chinese Buddhism can often look strange. Some ideas that were debated and defended by Indian Buddhists do not appear anywhere in Chinese Buddhism and some assumptions have been quietly added to Buddhism by Chinese Buddhists. By showing that Priest's work brings out the 'innovation' that Chinese Buddhists gave to Buddhism, I will suggest that it is this decentering that Siderits suggests Priest makes use of. (shrink)

I consider a familiar argument for two-boxing in Newcomb's Problem and find it defective because it involves a type of divergence from standard Baysian reasoning, which, though sometimes justified, conflicts with the stipulations of the Newcomb scenario. In an appendix, I also find fault with a different argument for two-boxing that has been presented by Graham Priest.

The view that contradictions cannot be true has been part of accepted philosophical theory since at least the time of Aristotle. In this regard, it is almost unique in the history of philosophy. Only in the last forty years has the view been systematically challenged with the advent of dialetheism. Since Graham Priest introduced dialetheism as a solution to certain self-referential paradoxes, the possibility of true contradictions has been a live issue in the philosophy of logic. Yet, despite the (...) arguments advanced by dialetheists, many logicians and philosophers still hold the opinion that contradictions cannot be true. -/- Rather than advocating the truth of certain contradictions, this thesis offers a different challenge to the classical logician. By showing that it can be philosophically coherent to propose that true contradictions are metaphysically possible, the thesis suggests that the classical logician must do more than she currently has to justify her confidence in the impossibility of true contradictions. Simply fighting off the dialetheist’s putative examples of true contradictions at the actual world isn’t enough to justify the classical logician’s conclusion that true contradictions are impossible. -/- To aid the thesis dialectically, we introduce a new position, absolutism, which hypothesises that it’s metaphysically possible for at least one contradiction to be true, contrasting with the dialetheic hypothesis that some contradictions are true in the actual world. We demonstrate that absolutism can be given a philosophically coherent interpretation, an appropriate logic, and that certain criticisms are completely toothless against absolutism. The challenge put to the classical logician is then: On what logical or philosophical grounds can we rule out the metaphysical possibility of true contradictions? (shrink)

This article is an inquiry into how the relationship between the principle of non-contradiction and the limits of thought has been understood by thinkers as diverse as Hegel, Heidegger, Levinas, and Graham Priest. While Heidegger and Levinas focus on the question of temporality and Priest takes a formal approach, all these philosophers effectively maintain that the principle of non-contradiction imposes a restriction on thought that disables it from adequately accounting for its own limits and thus what lies beyond those (...) limits, the implication being that the violation of the principle is necessary for such an accounting to take place. However, the ultimate argument here is that, contrary to Priest’s interpretation, Hegel’s philosophy can be convincingly read as supporting the idea that the mind’s ability to go beyond any particular limit of thought can actually be said to involve an adherence to a normative demand to locate and dispel the contradictions that emerge through the very setting of determinative limits. This is a non-formal consistency that evinces a “logic” that is unknowingly followed by the Heideggerian and Levinasian phenomenological philosophies of transcendence. (shrink)

This article appeals to the table of nothingness (Nichts) occurring within Kant's Critique of Pure Reason to assess three recent accounts of nothingness - by Graham Priest, Filippo Costantini, and Filippo Casati & Naoya Fujikawa - under the light of folk preconceptions about nothingness. After defining the two strongest preconceptions as the absence of unrestrictedly everything (nihil absolutum) and the idea of nothingness as a self-contradictory item (nihil negativum), I argue that both might be read as two Aristotelian connected (...) homonyms, rather than conflating them into a single item (as Priest's and Casati and Fujikawa's accounts seem to do), or dropping the idea of the nihil absolutum, as Costantini's account does. (shrink)

In ‘Towards a Solution to the Sorites Paradox’, Graham Priest gives us a new account of the sorites based on fuzzy logic. The novelty lies in the suggestion that truth-value assignments should themselves be treated as fuzzy objects, i.e., objects about which we can make fuzzy identity statements. I argue that Priest’s solution does not have the explanatory force that Priest advocates. That is, it does not explain why we find the existence of a cut-off point counter-intuitive. I also (...) argue that this sort of explanation calls for a general theory that goes beyond the special case of linguistic vagueness, for the phenomenon is at bottom not linguistic. (shrink)

COTENT -/- (second April 2019) Why so many people (from so many countries/domains/on so many topics) have already plagiarized my ideas? (Gabriel Vacariu) -/- Some preliminary comments Introduction: The EDWs perspective in my article from 2005 and my book from 2008 -/- I. PHYSICS, COGNITIVE NEUROSCIENCE, PHILOSOPHY (‘REBORN DINOSAURS’ ) • (2016) Did Sean Carroll’s ideas (California Institute of Technology, USA) plagiarize my ideas (2002-2010) (within the EDWs framework)? • (2016) Frank Wilczek’s ideas (Nobel Prize in Physics) (Philosophy of Mind (...) and Quantum Mechanics) • (2017-2019 - NEW March 2019) Carlo Rovelli’s ideas (Italy) in three books (2015, 2017) to my ideas (2002-2008) + commentary February 2018! • (2016) Kastner + (2017) R. E. Kastner, Stuart Kauffman, Michael Epperson • (2017) A trick: Lee Smolin’s ideas (2017) and my ideas (2002-2008) • (May 2018) ‘Thus spoke Zarathustra!’ - A fairy-tale with Eugen Ionesco and the Idiot about Nothingness -/- II. PHYSICS • (2011) Radu Ionicioiu (Physics, University of Bucharest, Romania) and Daniel R. Terno (Physics, Macquarie University, Sydney, Australia) • (2013) Côté B. Gilbert (Oontario, Canada) • (2015) Pikovski Igor, Zych Magdalena, Costa Fabio, and Brukner Časlav’s ideas and my ideas (2006-2008) (Quantum Mechanics) • (2015) Elisabetta Caffau’s ideas (Center for Astronomy at the University of Heidelberg and the Paris Observatory) and my ideas (2011, 2014) • (2015) Did Wolfram Schommers (University of Texas at Arlington, USA & Karlsruhe Institute of Technology, Germany) (Physics) • (2015) "Dark Matter May be 'Another Dimension' - Or Even a Major Galactic Transport System" January 22, 2015 • (2016) Dylan H. Mahler, Lee Rozema, Kent Fisher, Lydia Vermeyden, Kevin J. Resch, Howard M. Wiseman, and Aephraim Steinberg’s ideas (USA) • (2016) Bill Poirier’s ‘Many Interacting Worlds’ (Quantum Mechanics) • (2016 or Adam Frank’s ideas (University of Rochester in New York , USA) • (2017, 2017) Did Sebastian de Haro (HPS, Cambridge, UK) plagiarize my ideas (2002-2008) • (2017) Laura Condiotto’s ideas and my ideas (2002-2008) • (2016) Hugo F. Alrøe and Egon Noe’s (Department of Agroecology, Aarhus University, Denmark) ideas (USA) • (2017) Federico Zalamea’s ideas and my ideas • (2018) Peter J. Lewis’s ideas (2018) and my ideas (2002-2008) • (2018) Timothy Hollowood, ‘Classical from Quantum’, [arXiv:1803.04700v1 [quant-ph] 13 March 2018] • (2018) Mario Hubert and Davide Romano, ‘The Wave-Function as a Multi-Field’ -/- III. COGNITIVE NEUROSCIENCE AND PHILOSOPHY OF MIND • (2011-2014) Did Georg Northoff (Psychoanalysis, Institute of Mental Health) plagiarize my ideas (2002-2008)? • (2011) Kalina Diego Cosmelli, Legrand Dorothée and Thompson Evan’s ideas (USA) and my ideas (Cognitive Neuroscience) • (2015) Did David Ludwig (Philosophy, University of Amsterdam) plagiarize many of my ideas? (Philosophy (of Mind) • (2016) Neil D. Theise (Department of Pathology, Icahn School of Medicine at Mount Sinai, New York, USA) and Kafatos C. Menas (Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, USA) • David Bourget (2018) (Director, Centre for Digital Philosophy, Western University (or University of Western Ontario) + Chalmers • (2016) Dan Siegel’s ideas (Mindsight Institute, USA) -/- IV. Philosophy (of science) • (2010) Alexey Alyushin (Moscow, Russia) • (2013 + 2017) Did Markus Gabriel (Bonn University) • (2013) Andrew Newman’s ideas (University of Nebraska, at Omaha, USA) • (2016) Did Tahko E. Tuomas (University of Helsinki, Finland) plagiarize my ideas? + Tahko E. Tuomas (‘The Epistemology of Essence’) • (2017) Jani Hakkarainen (University of Tampere, Finland) + (2017) Markku Keinänen, Antti Keskinen & Jani Hakkarainen • (2017) Dean Rickles’s ideas (HPS, Univ. of Sydney) • (2017) Did Dirk K. F. Meijer and Hans J. H. Geesink (University of Groningen, Netherlands • (2018) Jason Winning’s ideas (2018) • (2018) David Mark Kovacs (Lecturer of philosophy at Tel Aviv University) -/- Conclusion Bibliography -/- July 2018 • Oreste M. Fiocco • Baptiste Le Bihan (University of Geneva, forthcoming) • Antonella Mallozzi (The Graduate Center – CUNY, forthcoming in Synthese, penultimate draft) • Erik C. Banks (Wright State University, 2014) • Sami Pihlström (2009) • Katherin Koslicki’s ideas (2008) -/- November 2018 • Maurizio Ferraris (2014/2012) Manifesto of New Realism • Graham Harman (2017) : Object-Oriented Ontology: -/- January 2019 • Philip Ball (2018): “Why everything you thought you knew about quantum physics is different” • Gerhard Grössing “Vacuum landscaping: cause of nonlocal influences without signaling” • Anne Sophie Meincke (November 2018) The Disappearance of Change (IJPS) • Baptiste Le Bihana (University of Geneva) and James Read (Oxford Univ.) “Duality and Ontology” • Baptiste Le Bihan (University of Geneva): “Space Emergence in Contemporary Physics: • Alexander Alexandrovich Antonov (2016) -/- February 2019 • James Barham (2019): “The Reality of Purpose and the Reform of Naturalism” • Giorgio Lando (2017) Mereology - A Philosophical Introduction, Bloomsbury Academic • (2018) Albrecht von M¨uller • Elias Zafiris, Concept and Formalization of Constellatory Self-Unfolding • (2019) Flaminia Giacomini, Esteban Castro-Ruiz, & Časlav Brukner • (2019) Valia Allori, “Scientific Realism without the Wave-Function: An Example of Naturalized Quantum Metaphysics” • (2018) Paulo De Jesus “Thinking through enactive agency: • (2016) TIMOTHY MORTON, For a Logic of Future Coexistence, (Columbia University Press) • (2017) Andrew Cooper, Two directions for teleology: -/- March 2019 • (2019) Massimiliano Proietti,1 Alexander Pickston,1 Francesco Graffitti,1 Peter Barrow,1 Dmytro Kundys,1 Cyril Branciard,2 Martin Ringbauer,1, 3 and Alessandro Fedrizzi1: (2019) “Experimental rejection of observer-independence in the quantum world” • (2015) Cˇaslav Brukner On the quantum measurement problem, • (2015) Mateus Araújo, Cyril Branciard, Fabio Costa, Adrien Feix, Christina Giarmatzi, Časlav Brukner, Witnessing causal nonseparability, • (2008 + 2013) Giulio Chiribella,∗ Giacomo Mauro D’Ariano,† and Paolo Perinotti‡ QUIT Group, Dipartimento di Fisica “A. Volta” and INFM, via Bassi 6, 27100 Pavia, Italy§ (Dated: October 22, 2018): Transforming quantum operations: quantum supermaps (22 Oct 2008) + Giulio Chiribella,1, ∗ Giacomo Mauro D’Ariano,2, † Paolo Perinotti,2, ‡ and Benoit Valiron3, § (2013), Quantum computations without definite causal structure, • (2013) Ognyan Oreshkov1;2, Fabio Costa1, Cˇ aslav Brukner1;3, Quantum correlations • (2018) Marcus Schmieke, Kränzlin, 17 July 2018, “Orthogonal Complementarity -/- April 2019 These articles are in this book: Reality and its Structure - Essays in Fundamentality, Ricki Bliss and Graham Priest (2018), Oxford Univ Press -/- Gabriel Oak Rabin (2018) Grounding Orthodoxy and the Layered Conception Daniel Nolan (2018) Cosmic Loops Naomi Thompson (2018) Metaphysical Interdependence, Epistemic Coherentism, and Tuomas E. Tahko (2018) Holistic Explanation Fundamentality and Ontological Minimality Matteo Morganti (2018) The Structure of Physical Reality Beyond Foundationalism Nathan Wildman (2018) On Shaky Ground? Exploring the Contingent Fundamentality Thesis -/- (2015) M. Ringbauer, B. Duffus, C. Branciard1;3, E. G. Cavalcanti4, A. G. White1;2 & A. Fedrizzi: “Measurements on the reality of the wavefunction” . (shrink)