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  1. Can It Be Irrational to Knowingly Choose the Best?Jack Spencer - forthcoming - Australasian Journal of Philosophy.
    Seeking a decision theory that can handle both the Newcomb problems that challenge evidential decision theory and the unstable problems that challenge causal decision theory, some philosophers recently have turned to ‘graded ratifiability’. The graded ratifiability approach to decision theory is, however, despite its virtues, unsatisfactory; for it conflicts with the platitude that it is always rationally permissible for an agent to knowingly choose their best option.
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  2. Reconsidering the Alleged Cases of Knowledge From Falsehood.Kok Yong Lee - 2021 - Philosophical Investigations 44 (2):151-162.
    A number of philosophers have recently proposed several alleged cases of “knowledge from falsehood,” i.e., cases of inferential knowledge epistemised by an inference with a false crucial premise. This paper examines such cases and argues against interpreting them as cases of knowledge from falsehood. Specifically, I argue that the inferences in play in such cases are in no position to epistemise their conclusions.
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  3. Knowledge Closure and Knowledge Openness: A Study of Epistemic Closure Principles.Levi Spectre - 2009 - Stockholm: Stockholm University.
    The principle of epistemic closure is the claim that what is known to follow from knowledge is known to be true. This intuitively plausible idea is endorsed by a vast majority of knowledge theorists. There are significant problems, however, that have to be addressed if epistemic closure – closed knowledge – is endorsed. The present essay locates the problem for closed knowledge in the separation it imposes between knowledge and evidence. Although it might appear that all that stands between knowing (...)
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  4. Conditioning Principles: On Bioethics and The Problem of Ableism.Joel Michael Reynolds - 2021 - In Elizabeth Victor & Laura Guidry Grimes (eds.), Applying Nonideal Theory to Bioethics: Living and Dying in a Nonideal World. Springer. pp. 99-118.
    This paper has two goals. The first is to argue that the field of bioethics in general and the literature on ideal vs. nonideal theory in particular has underemphasized a primary problem for normative theorizing: the role of conditioning principles. I define these as principles that implicitly or explicitly ground, limit, or otherwise determine the construction and function of other principles, and, as a result, profoundly impact concept formation, perception, judgment, and action, et al. The second is to demonstrate that (...)
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  5. Potentiality as the Basis of Reality, A Speculative Approach.Erwin Sonderegger - manuscript
    Is reality the basis of everything or has reality itself an other basis? What makes reality – not the real things – to be active, to exist? The question of what is real seems to be an easy question, because in our daily lives we are and must be naive realists. We ourselves, the things around us, the world, the facts, all that is real. there must be several concepts of reality if we want to say that not only physical (...)
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  6. Definition and the Foundations of Knowledge in Illuminationist Philosophy: Section on Expository Propositions (Al-Aqwāl Al-Shāriḥa),.Hossein Ziai - 1993 - In Borhan Ibneh Yousef (ed.), Papers in Honor of ‘Ostād’ Javad Mosleh. Los Angeles: Research & Education Center. pp. 108-130.
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  7. At the Threshold of Knowledge.Daniel Rothschild & Levi Spectre - 2018 - Philosophical Studies 175 (2):449-460.
    We explore consequences of the view that to know a proposition your rational credence in the proposition must exceed a certain threshold. In other words, to know something you must have evidence that makes rational a high credence in it. We relate such a threshold view to Dorr et al.’s :277–287, 2014) argument against the principle they call fair coins: “If you know a coin won’t land tails, then you know it won’t be flipped.” They argue for rejecting fair coins (...)
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  8. Bagimsiz Yasam Istegi.Hasan Bulent Paksoy - 2012 - Florence: Carrie/European University Institute.
    Universite’nin gorevi nedir? Su tanim’i yapabiliriz: dusunceleri birlestirip,ilerletmek. Dusunceleri birlestirmek ve ilerletmek neden gereklidir? Bir atilim’a gecmek icin, yer alacak olaylarin onceden ve kapsamli olarakdusunulmesi gerekir. Dusunceler, bir atilimin baslangicidir ve yalniz universite icinde gelismez.Dusunceler bir yonetim'e katilim birimi icinde gelkisebilecegi gibi, arkadastopluluklari icinde de yer alabilir. Ayrica, bir tek kisi'ce de olusturulup birkitap icinde dunya'ya sunulabilir.
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  9. Closure of A Priori Knowability Under A Priori Knowable Material Implication.Jan Heylen - 2015 - Erkenntnis 80 (2):359-380.
    The topic of this article is the closure of a priori knowability under a priori knowable material implication: if a material conditional is a priori knowable and if the antecedent is a priori knowable, then the consequent is a priori knowable as well. This principle is arguably correct under certain conditions, but there is at least one counterexample when completely unrestricted. To deal with this, Anderson proposes to restrict the closure principle to necessary truths and Horsten suggests to restrict it (...)
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  10. Skeptical Appeal: The Source‐Content Bias.John Turri - 2014 - Cognitive Science 38 (5):307-324.
    Radical skepticism is the view that we know nothing or at least next to nothing. Nearly no one actually believes that skepticism is true. Yet it has remained a serious topic of discussion for millennia and it looms large in popular culture. What explains its persistent and widespread appeal? How does the skeptic get us to doubt what we ordinarily take ourselves to know? I present evidence from two experiments that classic skeptical arguments gain potency from an interaction between two (...)
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  11. Review of Steven D. Hales' Book: Relativism and the Foundations of Philosophy. [REVIEW]Manhal Hamdo - 2018 - INTERNATIONAL JOURNAL OF RESEARCH CULTURE SOCIETY 2 (1):200-204.
    This review is a critical evaluation of the main points of Steven D. Hales’ significant book: Relativism and the Foundations of Philosophy. To that end, I will first summarize his major line of argument pointing out to the richness and significance of the book. After that, I will argue that Hales’ account of intuition is subject to the challenge shown by some recent works written on the topic, and that it postulates a concept of knowledge that opposes Gettier’s one, without (...)
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  12. Operators in the Paradox of the Knower.Patrick Grim - 1993 - Synthese 94 (3):409 - 428.
    Predicates are term-to-sentence devices, and operators are sentence-to-sentence devices. What Kaplan and Montague's Paradox of the Knower demonstrates is that necessity and other modalities cannot be treated as predicates, consistent with arithmetic; they must be treated as operators instead. Such is the current wisdom.A number of previous pieces have challenged such a view by showing that a predicative treatment of modalities neednot raise the Paradox of the Knower. This paper attempts to challenge the current wisdom in another way as well: (...)
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  13. Truth, Omniscience, and the Knower.Patrick Grim - 1988 - Philosophical Studies 54 (1):9 - 41.
    Let us sum up. The paradox of the Knower poses a direct and formal challenge to the coherence of common notions of knowledge and truth. We've considered a number of ways one might try to meet that challenge: propositional views of truth and knowledge, redundancy or operator views, and appeal to hierarchy of various sorts. Mere appeal to propositions or operators, however, seems to be inadequate to the task of the Knower, at least if unsupplemented by an auxiliary recourse to (...)
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Closure of Knowledge
  1. Underdetermination and Closure: Thoughts on Two Sceptical Arguments.Martin Smith - forthcoming - In Matthew Jope & Duncan Pritchard (eds.), New Perspectives on Epistemic Closure. Routledge.
    In this paper, I offer reasons for thinking that two prominent sceptical arguments in the literature – the underdetermination-based sceptical argument and the closure-based sceptical argument – are less philosophically interesting than is commonly supposed. The underdetermination-based argument begs the question against a non-sceptic and can be dismissed with little fanfare. The closure-based argument, though perhaps not question-begging per se, does rest upon contentious assumptions that a non-sceptic is under no pressure to accept.
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  2. A Cumulative Case Argument for Infallibilism.Nevin Climenhaga - 2021 - In Christos Kyriacou & Kevin Wallbridge (eds.), Skeptical Invariantism Reconsidered. Routledge.
    I present a cumulative case for the thesis that we only know propositions that are certain for us. I argue that this thesis can easily explain the truth of eight plausible claims about knowledge: -/- (1) There is a qualitative difference between knowledge and non-knowledge. (2) Knowledge is valuable in a way that non-knowledge is not. (3) Subjects in Gettier cases do not have knowledge. (4) If S knows that P, P is part of S’s evidence. (5) If S knows (...)
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  3. Epistemic Closure Violation and Doxastic Modellability: Infallibilism and Fallibilism Through the Eyes of Doubt.Iñaki Xavier Larrauri Pertierra - manuscript
    Generally, an epistemic fallibilist considers it reasonable to claim, “I know that P, but I may be wrong.” An epistemic infallibilist, on the other hand, would consider this claim absurd. I argue initially that infallibilism presents more advantages in its assertion of the claim’s absurdity than fallibilism does in making the claim. One, infallibilism is not faulted with the propensity for violations of epistemic closure that beleaguers some fallibilist accounts, due in part to the latter’s problematic shunting of fallible epistemic (...)
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  4. Rosenkranz’s Logic of Justification and Unprovability.Jan Heylen - 2020 - Journal of Philosophical Logic 49 (6):1243-1256.
    Rosenkranz has recently proposed a logic for propositional, non-factive, all-things-considered justification, which is based on a logic for the notion of being in a position to know, 309–338 2018). Starting from three quite weak assumptions in addition to some of the core principles that are already accepted by Rosenkranz, I prove that, if one has positive introspective and modally robust knowledge of the axioms of minimal arithmetic, then one is in a position to know that a sentence is not provable (...)
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  5. The Mind as a Sponge, its Cognitive Artifacts, and Being in the 21st Century.Ho Manh Tung - 2020 - OSF Preprints 2020 (10).
    In this essay, I discuss the analogy of the mind as a sponge, the issues of cognitive artifacts, and being a mind in the 21st century.
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  6. The Fundamental Problem of Logical Omniscience.Peter Hawke, Aybüke Özgün & Francesco Berto - 2020 - Journal of Philosophical Logic 49 (4):727-766.
    We propose a solution to the problem of logical omniscience in what we take to be its fundamental version: as concerning arbitrary agents and the knowledge attitude per se. Our logic of knowledge is a spin-off from a general theory of thick content, whereby the content of a sentence has two components: an intension, taking care of truth conditions; and a topic, taking care of subject matter. We present a list of plausible logical validities and invalidities for the logic of (...)
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  7. The Hardest Paradox for Closure.Martin Smith - forthcoming - Erkenntnis:1-26.
    According to the principle of Conjunction Closure, if one has justification for believing each of a set of propositions, one has justification for believing their conjunction. The lottery and preface paradoxes can both be seen as posing challenges for Closure, but leave open familiar strategies for preserving the principle. While this is all relatively well-trodden ground, a new Closure-challenging paradox has recently emerged, in two somewhat different forms, due to Marvin Backes (2019a) and Francesco Praolini (2019). This paradox synthesises elements (...)
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  8. Mark McBride, Basic Knowledge and Conditions on Knowledge, Cambridge: Open Book Publishers, 2017, 228 Pp., £16.95 , ISBN 978‐1‐78374‐283‐7. [REVIEW]Artūrs Logins - 2019 - Dialectica 73 (1-2):280-285.
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  9. Enough is Enough: Austin on Knowing.Guy Longworth - 2018 - In Savas L. Tsohatzidis (ed.), Interpreting J. L. Austin: Critical Essays. Oxford, UK: pp. 186–205.
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  10. Closure, Credence and Rationality: A Problem for Non-Belief Hinge Epistemology.Matt Jope - 2019 - Synthese (Suppl 15):1-11.
    Duncan Pritchard’s Epistemic Angst promises a novel solution to the closure-based sceptical problem that, unlike more traditional solutions, does not entail revising our fundamental epistemological commitments. In order to do this, it appeals to a Wittgensteinian account of rational evaluation, the overarching theme of which is that it neither makes sense to doubt nor to believe in our anti-sceptical hinge commitments. The purpose of this paper is to show that the argument for the claim that there can be no rational (...)
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  11. Semantic Externalism. [REVIEW]Ricardo Miguel & Diogo Santos - 2016 - Disputatio 8 (42):131-137.
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  12. Perceptual Knowledge, Discrimination, and Closure.Santiago Echeverri - 2020 - Erkenntnis 85 (6):1361-1378.
    Carter and Pritchard (2016) and Pritchard (2010, 2012, 2016) have tried to reconcile the intuition that perceptual knowledge requires only limited discriminatory abilities with the closure principle. To this end, they have introduced two theoretical innovations: a contrast between two ways of introducing error-possibilities and a distinction between discriminating and favoring evidence. I argue that their solution faces the “sufficiency problem”: it is unclear whether the evidence that is normally available to adult humans is sufficient to retain knowledge of the (...)
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  13. Knowing and Checking: An Epistemological Investigation.Guido Melchior - 2019 - New York City, New York, USA: Routledge.
    This book is primarily about checking and only derivatively about knowing. Checking is a very common concept for describing a subject’s epistemic goals and actions. Surprisingly, there has been no philosophical attention paid to the notion of checking. In Part I, I develop a sensitivity account of checking. To be more explicit, I analyze the internalist and externalist components of the epistemic action of checking which include the intentions of the checking subject and the necessary externalist features of the method (...)
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  14. Pragmatic Encroachment and Closure.Charity Anderson & John Hawthorne - forthcoming - In Brian Kim & Matthew McGrath (eds.), Pragmatic Encroachment in Epistemology. Routledge.
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  15. Knowability Relative to Information.Peter Hawke & Franz Berto - forthcoming - Mind.
    We present a formal semantics for epistemic logic, capturing the notion of knowability relative to information (KRI). Like Dretske, we move from the platitude that what an agent can know depends on her (empirical) information. We treat operators of the form K_AB (‘B is knowable on the basis of information A’) as variably strict quantifiers over worlds with a topic- or aboutness- preservation constraint. Variable strictness models the non-monotonicity of knowledge acquisition while allowing knowledge to be intrinsically stable. Aboutness-preservation models (...)
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  16. Can Probability Theory Explain Why Closure is Both Intuitive and Prone to Counterexamples?Marcello Di Bello - 2018 - Philosophical Studies 175 (9):2145-2168.
    Epistemic closure under known implication is the principle that knowledge of "p" and knowledge of "p implies q", together, imply knowledge of "q". This principle is intuitive, yet several putative counterexamples have been formulated against it. This paper addresses the question, why is epistemic closure both intuitive and prone to counterexamples? In particular, the paper examines whether probability theory can offer an answer to this question based on four strategies. The first probability-based strategy rests on the accumulation of risks. The (...)
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  17. Four Arguments for Denying That Lottery Beliefs Are Justified.Martin Smith - 2021 - In Douven, I. ed. Lotteries, Knowledge and Rational Belief: Essays on the Lottery Paradox (Cambridge: Cambridge University Press). Cambridge:
    A ‘lottery belief’ is a belief that a particular ticket has lost a large, fair lottery, based on nothing more than the odds against it winning. The lottery paradox brings out a tension between the idea that lottery beliefs are justified and the idea that that one can always justifiably believe the deductive consequences of things that one justifiably believes – what is sometimes called the principle of closure. Many philosophers have treated the lottery paradox as an argument against the (...)
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  18. Modal Epistemology.Juhani Yli-Vakkuri & John Hawthorne - manuscript
    Some central epistemological notions are expressed by sentential operators O that entail the possibility of knowledge in the sense that 'Op' entails 'It is possible to know that p'. We call these modal-epistemological notions. Using apriority and being in a position to know as case studies, we argue that the logics of modal epistemological notions are extremely weak. In particular, their logics are not normal and do not include any closure principles.
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  19. Ignorance and Knowledge: The Viability of Externalist Neo-Mooreanism as a Resonse to Radical Scepticism.John Asquith - 2017 - Dissertation, King's College London
    Here, I shall be examining the viability of a Moorean response to the Argument from Ignorance; i.e., one that tries to rebut the argument by denying its first premise that we cannot have knowledge that we are not BIVs. After first explicating the Argument from Ignorance in detail, I then go on to try and motivate this approach by critically examining two alternative approaches to dealing with radical scepticism: closure-denial, and attributer contextualism. Finding them wanting, I then turn to a (...)
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  20. On the Factivity of Implicit Intersubjective Knowledge.Alessandro Giordani - 2014 - Synthese 191 (8):1909-1923.
    The concept of knowledge can be modelled in epistemic modal logic and, if modelled by using a standard modal operator, it is subject to the problem of logical omniscience. The classical solution to this problem is to distinguish between implicit and explicit knowledge and to construe the knowledge operator as capturing the concept of implicit knowledge. In addition, since a proposition is said to be implicitly known just in case it is derivable from the set of propositions that are explicitly (...)
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  21. Lotteries, Possibility and Skepticism.Daniel Immerman - 2015 - Skepsis: A Journal for Philosophy and Interdisciplinary Research 12:51-67.
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  22. Skepticism and Epistemic Closure: Two Bayesian Accounts.Luca Moretti & Tomoji Shogenji - 2017 - International Journal for the Study of Skepticism 7 (1):1-25.
    This paper considers two novel Bayesian responses to a well-known skeptical paradox. The paradox consists of three intuitions: first, given appropriate sense experience, we have justification for accepting the relevant proposition about the external world; second, we have justification for expanding the body of accepted propositions through known entailment; third, we do not have justification for accepting that we are not disembodied souls in an immaterial world deceived by an evil demon. The first response we consider rejects the third intuition (...)
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  23. Evidence and the Openness of Knowledge.Assaf Sharon & Levi Spectre - 2017 - Philosophical Studies 174 (4):1001-1037.
    The paper argues that knowledge is not closed under logical inference. The argument proceeds from the openness of evidential support and the dependence of empirical knowledge on evidence, to the conclusion that knowledge is open. Without attempting to provide a full-fledged theory of evidence, we show that on the modest assumption that evidence cannot support both a proposition and its negation, or, alternatively, that information that reduces the probability of a proposition cannot constitute evidence for its truth, the relation of (...)
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  24. On Sharon and Spectre’s Argument Against Closure.Juan Comesaña - 2017 - Philosophical Studies 174 (4):1039-1046.
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  25. Epistemology and Information.Dretske Fred - 2008 - In Pieter Adriaans & Johan Van Benthem (eds.), Handbook of the Philosophy of Science, Volume 8. Philosophy of Information. Amsterdam, The Netherlands: Elsevier-North Holland. pp. 29-47.
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  26. A Closer Look at Closure Scepticism.Michael Blome-Tillmann - 2006 - Proceedings of the Aristotelian Society (Paperback) 106 (3):381-390.
    The most prominent arguments for scepticism in modern epistemology employ closure principles of some kind. To begin my discussion of such arguments, consider Simple Knowledge Closure (SKC): (SKC) (Kxt[p] ∧ (p → q)) → Kxt[q].1 Assuming its truth for the time being, the sceptic can use (SKC) to reason from the two assumptions that, firstly, we don’t know ¬sh and that, secondly, op entails ¬sh to the conclusion that we don’t know op, where ‘op’ and ‘sh’ are shorthand for ‘ordinary (...)
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  27. An Argument for External World Skepticism From the Appearance/Reality Distinction.Moti Mizrahi - 2016 - International Journal for the Study of Skepticism 6 (4):368-383.
    In this paper, I argue that arguments from skeptical hypotheses for external world skepticism derive their support from a skeptical argument from the distinction between appearance and reality. This skeptical argument from the appearance/reality distinction gives the external world skeptic her conclusion without appealing to skeptical hypotheses and without assuming that knowledge is closed under known entailments. If this is correct, then this skeptical argument from the appearance/reality distinction poses a new skeptical challenge that cannot be resolved by denying skeptical (...)
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  28. Epistemic Closure in Folk Epistemology.James R. Beebe & Jake Monaghan - 2018 - In Oxford Studies in Experimental Philosophy, Volume Two. New York: Oxford University Press. pp. 38-70.
    We report the results of four empirical studies designed to investigate the extent to which an epistemic closure principle for knowledge is reflected in folk epistemology. Previous work by Turri (2015a) suggested that our shared epistemic practices may only include a source-relative closure principle—one that applies to perceptual beliefs but not to inferential beliefs. We argue that the results of our studies provide reason for thinking that individuals are making a performance error when their knowledge attributions and denials conflict with (...)
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  29. Learning From Learning From Our Mistakes.Clayton Littlejohn - 2016 - In Pedro Schmechtig & Martin Grajner (eds.), Epistemic Reasons, Norms and Goals. De Gruyter. pp. 51-70.
    What can we learn from cases of knowledge from falsehood? Critics of knowledge-first epistemology have argued that these cases provide us with good reason for rejecting the knowledge accounts of evidence, justification, and the norm of belief. I shall offer a limited defense of the knowledge-first approach to these matters. Knowledge from falsehood cases should undermine our confidence in like-from-like reasoning in epistemology. Just as we should be open to the idea that knowledge can come from non-knowledge, we should be (...)
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  30. Lotteries and Prefaces.Matthew A. Benton - 2017 - In Jonathan Jenkins Ichikawa (ed.), The Routledge Handbook of Epistemic Contextualism. New York: Routledge. pp. 168-176.
    The lottery and preface paradoxes pose puzzles in epistemology concerning how to think about the norms of reasonable or permissible belief. Contextualists in epistemology have focused on knowledge ascriptions, attempting to capture a set of judgments about knowledge ascriptions and denials in a variety of contexts (including those involving lottery beliefs and the principles of closure). This article surveys some contextualist approaches to handling issues raised by the lottery and preface, while also considering some of the difficulties encountered by those (...)
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  31. Easy Knowledge, Closure Failure, or Skepticism: A Trilemma.Guido Melchior - 2016 - Metaphilosophy 47 (2):214-232.
    This article aims to provide a structural analysis of the problems related to the easy knowledge problem. The easy knowledge problem is well known. If we accept that we can have basic knowledge via a source without having any prior knowledge about the reliability or accuracy of this source, then we can acquire knowledge about the reliability or accuracy of this source too easily via information delivered by the source. Rejecting any kind of basic knowledge, however, leads into an infinite (...)
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  32. In Defense of Sensitivity.Tim Black & Peter Murphy - 2007 - Synthese 154 (1):53-71.
    The sensitivity condition on knowledge says that one knows that P only if one would not believe that P if P were false. Difficulties for this condition are now well documented. Keith DeRose has recently suggested a revised sensitivity condition that is designed to avoid some of these difficulties. We argue, however, that there are decisive objections to DeRose’s revised condition. Yet rather than simply abandoning his proposed condition, we uncover a rationale for its adoption, a rationale which suggests a (...)
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  33. Being in a Position to Know and Closure.Jan Heylen - 2016 - Thought: A Journal of Philosophy 5 (1):63-67.
    The focus of this article is the question whether the notion of being in a position to know is closed under modus ponens. The question is answered negatively.
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  34. Three Concepts of Chemical Closure and Their Epistemological Significance.Joseph E. Earley - 2013 - In Jean-Pierre Llored (ed.), The Philosophy of Chemistry: Practices, Methodology, and Concepts. Newcastle upon Tyne: Cambridge Scholars Press. pp. 506-616.
    Philosophers have long debated ‘substrate’ and ‘bundle’ theories as to how properties hold together in objects ― but have neglected to consider that every chemical entity is defined by closure of relationships among components ― here designated ‘Closure Louis de Broglie.’ That type of closure underlies the coherence of spectroscopic and chemical properties of chemical substances, and is importantly implicated in the stability and definition of entities of many other types, including those usually involved in philosophic discourse ― such as (...)
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  35. An Open and Shut Case: Epistemic Closure in the Manifest Image.John Turri - 2015 - Philosophers' Imprint 15.
    The epistemic closure principle says that knowledge is closed under known entailment. The closure principle is deeply implicated in numerous core debates in contemporary epistemology. Closure’s opponents claim that there are good theoretical reasons to abandon it. Closure’s proponents claim that it is a defining feature of ordinary thought and talk and, thus, abandoning it is radically revisionary. But evidence for these claims about ordinary practice has thus far been anecdotal. In this paper, I report five studies on the status (...)
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  36. The New and Old Ignorance Puzzles: How Badly Do We Need Closure?Brent G. Kyle - 2015 - Synthese 192 (5):1495-1525.
    Skeptical puzzles and arguments often employ knowledge-closure principles . Epistemologists widely believe that an adequate reply to the skeptic should explain why her reasoning is appealing albeit misleading; but it’s unclear what would explain the appeal of the skeptic’s closure principle, if not for its truth. In this paper, I aim to challenge the widespread commitment to knowledge-closure. But I proceed by first examining a new puzzle about failing to know—what I call the New Ignorance Puzzle . This puzzle resembles (...)
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  37. Epistemic Closure, Assumptions and Topics of Inquiry.Marcello Di Bello - 2014 - Synthese 191 (16):3977-4002.
    According to the principle of epistemic closure, knowledge is closed under known implication. The principle is intuitive but it is problematic in some cases. Suppose you know you have hands and you know that ‘I have hands’ implies ‘I am not a brain-in-a-vat’. Does it follow that you know you are not a brain-in-a-vat? It seems not; it should not be so easy to refute skepticism. In this and similar cases, we are confronted with a puzzle: epistemic closure is an (...)
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