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20-September-2008 09:29:10 - Epistemology Redirected from Epistemological This article or section is missing citations or needs footnotes. Using inline citations helps guard against copyright violations and factual inaccuracies. August 2007 Theory of Knowledge redirects here. For a secondary school curriculum, see Theory of Knowledge IB course. Certainty series: Agnosticism Belief Certainty Determinism Estimation Fallibilism Epistemology Nihilism Probability Uncertainty This box: view talk According to Theaetetus, knowledge is a subset of that which is both true and believed. According to Theaetetus, knowledge is a subset of that which is both true and believed. Epistemology from Greek επιστήμη - episteme, knowledge + λόγος, logos or theory of knowledge is a branch of philosophy concerned with the nature and scope of knowledge.1 The term was introduced into English by the Scottish philosopher James Frederick Ferrier 1808-1864.2 Much of the debate in this field has focused on analyzing the nature of knowledge and how it relates to similar notions such as truth, belief, and justification. It also deals with the means of production of knowledge, as well as skepticism about different knowledge claims. In other words, epistemology primarily addresses the following questions: What is knowledge?, How is knowledge acquired?, What do people know?, How do we know what we know? Contents 1 Knowledge 1.1 Distinguishing knowing that from knowing how 1.2 Belief 1.3 Truth 1.4 Justification 1.4.1 Plato 1.5 The Gettier problem 1.5.1 Responses to Gettier 1.5.1.1 Infallibilism, indefeasibility 1.5.1.2 Reliabilism 1.5.1.3 Other responses 1.6 Externalism and internalism 2 Acquiring knowledge 2.1 The regress problem 2.1.1 Response to the regress problem 2.1.1.1 Infinitism 2.1.1.2 Foundationalism 2.1.1.3 Coherentism 2.1.1.4 Foundherentism 2.2 A priori and a posteriori knowledge 2.3 Analytic/synthetic distinction 2.4 Specific theories of knowledge acquisition 2.4.1 Empiricism 2.4.2 Rationalism 2.4.3 Constructivism 3 What do people know? 3.1 Skepticism 3.2 Developments from skepticism 3.2.1 Fallibilism 4 Practical applications 5 See also 6 Notes 7 References and further reading 8 External links and references Knowledge The primary question that epistemology addresses is What is knowledge? This question is several millennia old. Distinguishing knowing that from knowing how In this article, and in epistemology in general, the kind of knowledge usually discussed is propositional knowledge, also known as knowledge-that as opposed to knowledge-how. For example: in mathematics, it is known that 2 + 2 = 4, but there is also knowing how to add two numbers. Many but not all philosophers thus think there is an important distinction between knowing that and knowing how, with epistemology primarily interested in the former. This distinction is recognized linguistically in many languages, though not in modern English except as dialect see verbs ken and wit in the Shorter Oxford Dictionary.3 In Personal Knowledge, Michael Polanyi articulates a case for the epistemological relevance of both forms of knowledge; using the example of the act of balance involved in riding a bicycle, he suggests that the theoretical knowledge of the physics involved in maintaining a state of balance cannot substitute for the practical knowledge of how to ride, and that it is important to understand how both are established and grounded. It is worth pointing out that in recent times, some epistemologists see Sosa, Greco, Kvanvig, Zagzebski have argued that we should not think of knowledge this way; Epistemology should evaluate people's properties i.e.,intellectual virtues instead of propositions' properties. This is, in short, because higher forms of cognitive success i.e., understanding involve non 'veritic' features which can't be evaluated from a justified true belief view of knowledge. Belief Main article: Belief Often, statements of belief mean that the speaker predicts something that will prove to be useful or successful in some sense - perhaps the speaker might believe in his or her favorite football team. This is not the kind of belief usually addressed within epistemology. The kind that is dealt with is when to believe something simply means any cognitive content held as true. For example, to believe that the sky is blue is to think that the proposition, The sky is blue, is true. Knowledge implies belief. The statement I know P, but I don't believe that P is true is contradictory. To know P is, among other things, to believe that P is true, or to believe in P. See the article on Moore's paradox. Truth Main article: Truth See also: Criteria of truth If someone believes something, he or she thinks that it is true but may be mistaken. This is not the case with knowledge. For example, a man thinks that a particular bridge is safe enough to support him, and he attempts to cross it; unfortunately, the bridge collapses under his weight. It could be said that the man believed that the bridge was safe, but that his belief was mistaken. It would not be accurate to say that he knew that the bridge was safe, because plainly it was not. By contrast, if the bridge actually supported his weight then he might be justified in subsequently holding that he knew the bridge had been safe enough for his passage, at least at that particular time. For something to count as knowledge, it must actually be true. The Aristotelian definition of truth states: To say of something which is that it is not, or to say of something which is not that it is, is false. However, to say of something which is that it is, or of something which is not that it is not, is true. Justification Plato Main article: Theaetetus dialogue In Plato's dialogue Theaetetus, Socrates considers a number of theories as to what knowledge is, the last being that knowledge is true belief that has been given an account of - meaning explained or defined in some way. According to the theory that knowledge is justified true belief, in order to know that a given proposition is true, one must not only believe the relevant true proposition, but one must also have a good reason for doing so. One implication of this would be that no one would gain knowledge just by believing something that happened to be true. For example, an ill person with no medical training, but a generally optimistic attitude, might believe that he/she will recover from his/her illness quickly. Nevertheless, even if this belief turned out to be true, the patient would not have known that he/she would get well since his/her belief lacked justification. The definition of knowledge as justified true belief was widely accepted until the 1960s. At this time, a paper written by the American philosopher Edmund Gettier provoked widespread discussion. See theories of justification for other views on the idea. The Gettier problem Main article: Gettier problem In 1963 Edmund Gettier called into question the theory of knowledge that had been dominant among philosophers for thousands of years4. In a few pages, Gettier argued that there are situations in which one's belief may be justified and true, yet fail to count as knowledge. That is, Gettier contended that while justified belief in a proposition is necessary for that proposition to be known, it is not sufficient. As in the diagram above, a true proposition can be believed by an individual but still not fall within the knowledge category purple region. According to Gettier, there are certain circumstances in which one does not have knowledge, even when all of the above conditions are met. Gettier proposed two thought experiments, which have come to be known as Gettier cases, as counterexamples to the classical account of knowledge. One of the cases involves two men, Smith and Jones, who are awaiting the results of their applications for the same job. Each man has ten coins in his pocket. Smith has excellent reasons to believe that Jones will get the job and, furthermore, knows that Jones has ten coins in his pocket he recently counted them. From this Smith infers, the man who will get the job has ten coins in his pocket. However, Smith is unaware that he has ten coins in his own pocket. Furthermore, Smith, not Jones, is going to get the job. While Smith has strong evidence to believe that Jones will get the job, he is wrong. Smith has a justified true belief that a man with ten coins in his pocket will get the job; however, according to Gettier, Smith does not know that a man with ten coins in his pocket will get the job, because Smith's belief is ...true by virtue of the number of coins in Smith's pocket, while Smith does not know how many coins are in Smith's pocket, and bases his belief...on a count of the coins in Jones's pocket, whom he falsely believes to be the man who will get the job. see 4 p.122. These cases fail to be knowledge because the subject's belief is justified, but only happens to be true in virtue of luck. Responses to Gettier The responses to Gettier have been varied. Usually, they have involved substantive attempts to provide a definition of knowledge different from the classical one, either by recasting knowledge as justified true belief with some additional fourth condition, or as something else altogether. Infallibilism, indefeasibility In one response to Gettier, the American philosopher Richard Kirkham has argued that the only definition of knowledge that could ever be immune to all counterexamples is the infallibilist one.citation needed To qualify as an item of knowledge, so the theory goes, a belief must not only be true and justified, the justification of the belief must necessitate its truth. In other words, the justification for the belief must be infallible. See Fallibilism, below, for more information. Yet another possible candidate for the fourth condition of knowledge is indefeasibility. Defeasibility theory maintains that there should be no overriding or defeating truths for the reasons that justify one's belief. For example, suppose that person S believes they saw Tom Grabit steal a book from the library and uses this to justify the claim that Tom Grabit stole a book from the library. A possible defeater or overriding proposition for such a claim could be a true proposition like, Tom Grabit's identical twin Sam is currently in the same town as Tom. So long as no defeaters of one's justification exist, a subject would be epistemically justified. The Indian philosopher B K Matilal has drawn on the Navya-Nyaya fallibilism tradition to respond to the Gettier problem. Nyaya theory distinguishes between know p and know that one knows p - these are different events, with different causal conditions. The second level is a sort of implicit inference that usually follows immediately the episode of knowing p knowledge simpliciter. The Gettier case is analyzed by referring to a view of Gangesha 13th c., who takes any true belief to be knowledge; thus a true belief acquired through a wrong route may just be regarded as knowledge simpliciter on this view. The question of justification arises only at the second level, when one considers the knowledgehood of the acquired belief. Initially, there is lack of uncertainty, so it becomes a true belief. But at the very next moment, when the hearer is about to embark upon the venture of knowing whether he knows p, doubts may arise. If, in some Gettier-like cases, I am wrong in my inference about the knowledgehood of the given occurrent belief for the evidence may be pseudo-evidence, then I am mistaken about the truth of my belief -- and this is in accord with Nyaya fallibilism: not all knowledge-claims can be sustained.5 Reliabilism Main article: Reliabilism Reliabilism is a theory advanced by philosophers such as Alvin Goldman according to which a belief is justified or otherwise supported in such a way as to count towards knowledge only if it is produced by processes that typically yield a sufficiently high ratio of true to false beliefs. In other words, this theory states that a true belief counts as knowledge only if it is produced by a reliable belief-forming process. Reliabilism has been challenged by Gettier cases. Another argument that challenges reliabilism, like the Gettier cases although it was not presented in the same short article as the Gettier cases, is the case of Henry and the barn façades. In the thought experiment, a man, Henry, is driving along and sees a number of buildings that resemble barns. Based on his perception of one of these, he concludes that he has just seen barns. While he has seen one, and the perception he based his belief on was of a real barn, all the other barn-like buildings he saw were façades. Theoretically, Henry doesn't know that he has seen a barn, despite both his belief that he has seen one being true and his belief being formed on the basis of a reliable process i.e. his vision, since he only acquired his true belief by accident.citation needed Other responses The American philosopher Robert Nozick has offered the following definition of knowledge: S knows that P if and only if: P; S believes that P; if P were false, S would not believe that P; if P is true, S will believe that P. 6 Nozick believed that the third subjunctive condition served to address cases of the sort described by Gettier. Nozick further claims this condition addresses a case of the sort described by D. M. Armstrong7: A father believes his son innocent of committing a particular crime, both because of faith in his son and now because he has seen presented in the courtroom a conclusive demonstration of his son's innocence. His belief via the method of the courtroom satisfies the four subjunctive conditions, but his faith-based belief does not. If his son were guilty, he would still believe him innocent, on the basis of faith in his son; this would violate the third subjunctive condition. The British philosopher Simon Blackburn has criticized this formulation by suggesting that we do not want to accept as knowledge beliefs which, while they track the truth as Nozick's account requires, are not held for appropriate reasons. He says that we do not want to award the title of knowing something to someone who is only meeting the conditions through a defect, flaw, or failure, compared with someone else who is not meeting the conditions.citation needed Timothy Williamson, has advanced a theory of knowledge according to which knowledge is not justified true belief plus some extra conditions. In his book Knowledge and its Limits, Williamson argues that the concept of knowledge cannot be analyzed into a set of other concepts-instead, it is sui generis. Thus, though knowledge requires justification, truth, and belief, the word knowledge can't be, according to Williamson's theory, accurately regarded as simply shorthand for justified true belief. Externalism and internalism Main article: Internalism and externalism Part of the debate over the nature of knowledge is a debate between epistemological externalists on the one hand, and epistemological internalists on the other. Externalists think that factors deemed external, meaning outside of the psychological states of those who gain knowledge, can be conditions of knowledge. For example, an externalist response to the Gettier problem is to say that, in order for a justified, true belief to count as knowledge, it must be caused, in the right sort of way, by relevant facts. Such causation, to the extent that it is outside the mind, would count as an external, knowledge-yielding condition. Internalists, contrariwise, claim that all knowledge-yielding conditions are within the psychological states of those who gain knowledge. René Descartes, prominent philosopher and supporter of internalism wrote that, since the only method by which we perceive the external world is through our senses, and that, since the senses are not infallible, we should not consider our concept of knowledge to be infallible. The only way to find anything that could be described as infallibly true, he advocates, would be to pretend that an omnipotent, deceitful being is tampering with one's perception of the universe, and that the logical thing to do is to question anything that involves the senses. Cogito ergo sum I think, therefore I am is commonly associated with Descartes' theory, because he postulated that the only thing that he could not logically bring himself to doubt is his own existence: I do not exist is a contradiction in terms; the act of saying that one does not exist assumes that someone must be making the statement in the first place. Though Descartes could doubt his senses, his body and the world around him, he could not deny his own existence, because he was able to doubt and must exist in order to do so. Even if some evil genius were to be deceiving him, he would have to exist in order to be deceived. However from this Descartes did not go as far as to define what he was. This was pointed out by the materialist philosopher Pierre Gassendi 1592-1655 who accused Descartes of saying that he was not this and not that, while never saying what exactly was existing. One could argue that this is not an edifying question, because it doesn't matter what exactly exists, it only matters that it does indeed exist. Acquiring knowledge The second question that will be dealt with is the question of how knowledge is acquired. This area of epistemology covers what is called the regress problem, issues concerning epistemic distinctions such as that between experience and apriority as means of creating knowledge. Further that between synthesis and analysis used as a means of proof, and debates such as the one between empiricists and rationalists. The regress problem Main article: Regress argument Suppose we make a point of asking for a justification for every belief. Any given justification will itself depend on another belief for its justification, so one can also reasonably ask for this to be justified, and so forth. This appears to lead to an infinite regress, with each belief justified by some further belief. The apparent impossibility of completing an infinite chain of reasoning is thought by some to support skepticism. The skeptic will argue that since no one can complete such a chain, ultimately no beliefs are justified and, therefore, no one knows anything. The only thing I know for sure is that I do not know for sure. Response to the regress problem Many epistemologists studying justification have attempted to argue for various types of chains of reasoning that can escape the regress problem. Infinitism Some philosophers, notably Peter Klein in his Human Knowledge and the Infinite Regress of Reasons, have argued that it's not impossible for an infinite justificatory series to exist. This position is known as infinitism. Infinitists typically take the infinite series to be merely potential, in the sense that an individual may have indefinitely many reasons available to him, without having consciously thought through all of these reasons. The individual need only have the ability to bring forth the relevant reasons when the need arises. This position is motivated in part by the desire to avoid what is seen as the arbitrariness and circularity of its chief competitors, foundationalism and coherentism. Foundationalism Foundationalists respond to the regress problem by claiming that some beliefs that support other beliefs do not themselves require justification by other beliefs. Sometimes, these beliefs, labeled foundational, are characterized as beliefs that one is directly aware of the truth of, or as beliefs that are self-justifying, or as beliefs that are infallible. According to one particularly permissive form of foundationalism, a belief may count as foundational, in the sense that it may be presumed true until defeating evidence appears, as long as the belief seems to its believer to be true.citation needed Others have argued that a belief is justified if it is based on perception or certain a priori considerations. The chief criticism of foundationalism is that it allegedly leads to the arbitrary or unjustified acceptance of certain beliefs.citation needed Coherentism Another response to the regress problem is coherentism, which is the rejection of the assumption that the regress proceeds according to a pattern of linear justification. To avoid the charge of circularity, coherentists hold that an individual belief is justified circularly by the way it fits together coheres with the rest of the belief system of which it is a part. This theory has the advantage of avoiding the infinite regress without claiming special, possibly arbitrary status for some particular class of beliefs. Yet, since a system can be coherent while also being wrong, coherentists face the difficulty in ensuring that the whole system corresponds to reality. Foundherentism There is also a position known as foundherentism. Susan Haack is the philosopher who conceived it, and it is meant to be a unification of foundationalism and coherentism. One component of this theory is what is called the analogy of the crossword puzzle. Whereas, say, infinists regard the regress of reasons as shaped like a single line, Susan Haack has argued that it is more like a crossword puzzle, with multiple lines mutually supporting each other.citation needed A priori and a posteriori knowledge Main article: A priori and a posteriori philosophy The nature of this distinction has been disputed by various philosophers; however, the terms may be roughly defined as follows: A priori knowledge is knowledge that is known independently of experience that is, it is non-empirical. A posteriori knowledge is knowledge that is known by experience that is, it is empirical. Analytic/synthetic distinction Main article: Analytic/synthetic distinction Some propositions are such that we appear to be justified in believing them just so far as we understand their meaning. For example, consider, My father's brother is my uncle. We seem to be justified in believing it to be true by virtue of our knowledge of what its terms mean. Philosophers call such propositions analytic. Synthetic propositions, on the other hand, have distinct subjects and predicates. An example of a synthetic proposition would be, My father's brother has black hair. Kant held that all mathematical propositions are synthetic. The American philosopher W. V. O. Quine, in his Two Dogmas of Empiricism, famously challenged the distinction, arguing that the two have a blurry boundary. Specific theories of knowledge acquisition Empiricism Main article: Empiricism In philosophy, empiricism is generally a theory of knowledge emphasizing the role of experience, especially experience based on perceptual observations by the five senses. Certain forms treat all knowledge as empirical,citation needed while some regard disciplines such as mathematics and logic as exceptions.citation needed Rationalism Main article: Rationalism Rationalists believe that knowledge is primarily at least in some areas acquired by a priori processes or is innate-e.g., in the form of concepts not derived from experience. The relevant theoretical processes often go by the name intuition.citation needed The relevant theoretical concepts may purportedly be part of the structure of the human mind as in Kant's theory of transcendental idealism, or they may be said to exist independently of the mind as in Plato's theory of Forms. The extent to which this innate human knowledge is emphasized over experience as a means to acquire knowledge varies from rationalist to rationalist. Some hold that knowledge of any kind can only be gained a priori,citation needed while others claim that some knowledge can also be gained a posteriori.citation needed Consequently, the borderline between rationalist epistemologies and others can be vague. Constructivism Main article: Constructivist epistemology Constructivism is a view in philosophy according to which all knowledge is constructed in as much as it is contingent on convention, human perception, and social experience.citation needed Constructivism proposes new definitions for knowledge and truth that forms a new paradigm, based on inter-subjectivity instead of the classical objectivity and viability instead of truth. Piagetian constructivism, however, believes in objectivity as constructs can be validated through experimentation. The constructivist point of view is pragmatic as Vico said: the truth is to have made it. It originated in sociology under the term social constructionism and has been given the name constructivism when referring to philosophical epistemology, though constructionism and constructivism are often used interchangeably.citation neededConstructivism has also emerged in the field of International Relations, of which the writings of Alexander Wendt are most popular. Describing the characteristic nature of International reality marked by 'anarchy' he says, anarchy is what states make of it. What do people know? The last question that will be dealt with is the question of what people know. At the heart of this area of study is skepticism, with many approaches involved trying to disprove some particular form of it. Skepticism Main article: Philosophical skepticism Skepticism is related to the question of whether certain knowledge is possible. Skeptics argue that the belief in something does not necessarily justify an assertion of knowledge of it. In this skeptics oppose foundationalism, which states that there have to be some basic beliefs that are justified without reference to others. The skeptical response to this can take several approaches. First, claiming that basic beliefs must exist, amounts to the logical fallacy of argument from ignorance combined with the slippery slope. While a foundationalist would use Münchhausen Trilemma as a justification for demanding the validity of basic beliefs, a skeptic would see no problem with admitting the result. Please help improve this section by expanding it. Further information might be found on the talk page or at requests for expansion. June 2008 Developments from skepticism Fallibilism Main article: Fallibilism For most of philosophical history, knowledge was taken to mean belief that was true and justified to an absolute certainty.citation needed Early in the 20th century, however, the notion that belief had to be justified as such to count as knowledge lost favour. Fallibilism is the view that knowing something does not entail certainty regarding it. Please help improve this section by expanding it. Further information might be found on the talk page or at requests for expansion. June 2008 Practical applications Far from being purely academic, the study of epistemology is useful for a great many applications. It is particularly commonly employed in issues of law where proof of guilt or innocence may be required, or when it must be determined whether a person knew a particular fact before taking a specific action e.g., whether an action was premated. Other common applications of epistemology include: Mathematics and science History and archaeology Medicine diagnosis of disease Product testing How can we know that the product will not fail? Intelligence information gathering Religion and Apologetics Cognitive Science Artificial Intelligence Psychology Linguistics Literature Philosophy Knowledge Management Testimony Sociology Cultural Anthropology Do different cultures have different systems of knowledge? Austrian School of economics in the form of praxeology, the discovery of economic laws valid for all human action Please help improve this section by expanding it. Further information might be found on the talk page or at requests for expansion. June 2008 See also Adaptive representation Agnotology Analytic tradition Bayesian probability Cybernetic epistemology Constructivist epistemology Eastern epistemology Evidentialism Evidentiality General Semantics Knowledge by acquaintance Knowledge by description Meta-epistemology Methodology Methods of obtaining knowledge Monopolies of knowledge Mysticism Noölogy Objectivist epistemology Platonic epistemology Praxeology Reason Revelation Self-evidence Social epistemology Transcendence philosophy Virtue epistemology Conveyed concept Reformed epistemology Notes ^ Encyclopedia of Philosophy, Volume 3, 1967, Macmillan, Inc. ^ Encyclopaedia Britannica Online, 2007 ^ In French, Portuguese and Spanish, to know a person is 'connaître', 'conhecer', 'conocer', whereas to know how to do something is 'savoir', 'saber', 'saber'. In Greek the verbs are γνωÏ?ίζω gnorÃzo and ξÎÏ?ω kséro, respectively. In Italian the verbs are 'conoscere' and 'sapere' and the nouns for 'knowledge' are 'conoscenza' and 'sapienza', respectively. In German, the verbs are kennen and wissen. Wissen implies knowing as a fact, kennen implies knowing in the sense of being acquainted with and having a working knowledge of; there is also a noun derived from kennen, namely erkennen, which roughly implies knowledge in the form of recognition or acknowledgment. The verb itself implies a process: you have to go from one state to another: from a state of not-erkennen to a state of true erkennen. This verb seems to be the most appropriate in terms of describing the episteme in one of the modern European languages, hence the German name Erkenntnistheorie. ^ a b Gettier, Edmund 1963. Is Justified True Belief Knowledge?. Analysis 23: 121-23. doi:10.2307/3326922. ^ Bimal Krishna Matilal 1986. Perception: An essay on Classical Indian Theories of Knowledge. Oxford India 2002. The Gettier problem is dealt with in Chapter 4, Knowledge as a mental episode. The thread continues in the next chapter Knowing that one knows. It is also discussed in Matilal's Word and the World p. 71-72. ^ Robert Nozick 1981. Philosophical Explanations. Harvard University Press. Philosophical Explanations Chapter 3 Knowledge and Skepticism I. Knowledge Conditions for Knowledge p. 172-178. ^ D. M. Armstrong 1973. Belief, Truth and Knowledge. Cambridge University Press. References and further reading The London Philosophy Study Guide offers many suggestions on what to read, depending on the student's familiarity with the subject: Epistemology Methodology Annis, David. 1978. A Contextualist Theory of Epistemic Justification, in American Philosophical Quarterly, 15: 213-219. Boufoy-Bastick, Z. 2005. Introducing 'Applicable Knowledge' as a Challenge to the Attainment of Absolute Knowledge, Sophia Journal of Philosophy, 8: 39-51. Bovens, Luc Hartmann, Stephan. 2003. Bayesian Epistemology. Oxford: Oxford University Press. Butchvarov, Panayot. 1970. The Concept of Knowledge. Evanston, Northwestern University Press. Cohen, Stewart. 1998. Contextualist Solutions to Epistemological Problems: Scepticism, Gettier, and the Lottery. Australasian Journal of Philosophy, 76: 289-306. Cohen Stewart. 1999. Contextualism, Skepticism, and Reasons, in Tomberlin 1999. DeRose, Keith. 1992. Contextualism and Knowledge Attributions, Philosophy and Phenomenological Research, 15: 213-19. DeRose, Keith. 1999. Contextualism: An Explanation and Defense, in Greco and Sosa 1999. Feldman, Richard. 1999. Contextualism and Skepticism, in Tomberlin 1999, pp. 91-114. Gettier, Edmund. 1963. Is Justified True Belief Knowledge?, Analysis, Vol. 23, pp. 121-23. Online text. Greco, J. Sosa, E. 1999. Blackwell Guide to Epistemology, Blackwell Publishing. Harris, Errol E. 1970. Hypothesis And Perception, George Allen and Unwin, London, Reprinted 2002 Routledge, London. Harwood, Sterling. 1989. Taking Skepticism Seriously -- And In Context, Philosophical Investigations, Vol. 12. Hawthorne, John. 2005. The Case for Closure, Contemporary Debates in Epistemology, Peter Sosa and Matthias Steup ed.: 26-43. Hendricks, Vincent F. 2006. Mainstream and Formal Epistemology, New York: Cambridge University Press. Kant, Immanuel. 1781. Critique of Pure Reason Keeton, Morris T. 1962. Empiricism, in Dictionary of Philosophy, Dagobert D. Runes ed., Littlefield, Adams, and Company, Totowa, NJ, pp. 89-90. Kirkham, Richard. 1984. Does the Gettier Problem Rest on a Mistake? Mind, 93. Klein, Peter. 1981. Certainty: a Refutation of Scepticism, Minneapolis, MN: University of Minnesota Press. Kyburg, H.E. 1961. Probability and the Logic of Rational Belief, Middletown, CT: Wesleyan University Press. Korzybski, Alfred. 1994 1933. Science and Sanity: An Introduction to Non-Aristotelian Systems and General Semantics, Fifth ion. Ft. Worth, TX: Institute of General Semantics. Lewis, David. 1996. Elusive Knowledge. Australian Journal of Philosophy, 74, 549-67. Morin, Edgar. 1986. La Méthode, Tome 3, La Connaissance de la connaissance Method, 3rd volume : The knowledge of knowledge Nelson, Quee, 2007. The Slightest Philosophy, Indianapolis, IN: Dog Ear Publishing, 296 pages. Niiniluoto, Ilkka, 2002. Critical Scientific Realism, Oxford: Oxford Univ. Press. Popper, Karl R. 1972. Objective Knowledge: An Evolutionary Approach, Oxford: Oxford Univ. Press. Preyer, G./Siebelt, F./Ulfig, A. 1994. Language, Mind and Epistemology, Dordrecht: Kluwer Academic Publishers. Rand, Ayn. 1979. Introduction to Objectivist Epistemology, New York: Meridian. Russell, Bertrand. 1912. The Problems of Philosophy, New York: Oxford University Press. Schiffer, Stephen. 1996. Contextualist Solutions to Scepticism, Proceedings of the Aristotelian Society, 96:317-33. Steup, Matthias. 2005. Knowledge and Scepticism, Contemporary Debates in Epistemology, Peter Sosa and Matthias Steup eds.: 1-13. Tomberlin, James ed.. 1999. Philosophical Perspectives 13, Epistemology, Blackwell Publishing. Wittgenstein, Ludwig. 1922. Tractatus Logico-Philosophicus, C.K. Ogden trns., Dover. Online text. External links and references Stanford Encyclopedia of Philosophy articles: Bayesian Epistemology by William Talbott. Epistemology by Matthias Steup. Evolutionary Epistemology by Michael Bradie William Harms. Feminist Epistemology and Philosophy of Science by Elizabeth Anderson. Naturalized Epistemology by Richard Feldman. Social Epistemology by Alvin Goldman. Virtue Epistemology by John Greco. Other links: What Is Epistemology? - a brief introduction to the topic by Keith DeRose. Certain Doubts - a group blog run by Jonathan Kvanvig, with many leading epistemologists as contributors. The Epistemological Lifeboat by Birger Hjørland Jeppe Nicolaisen eds. The Epistemology Page by Keith DeRose. Justified True Belief and Critical Rationalism by Mathew Toll Epistemology Papers a collection of Michael Huemer's. Epistemology Introduction, Part 1 and Part 2 by Paul Newall at the Galilean Library. Teaching Theory of Knowledge 1986 - Marjorie Clay ed., an electronic publication from The Council for Philosophical Studies. Epistemology: The Philosophy of Knowledge - an introduction at Groovyweb. Introduction to Theory of Knowledge - from PhilosophyOnline. The Peripatetic A practical introduction to the theory of knowledge Theory of Knowledge - an introduction to epistemology, exploring the various theories of knowledge, justification, and belief. A Theory of Knowledge by Clóvis Juarez Kemmerich, on the Social Science Research Network, 2006. An Introduction to Epistemology by Paul Newall, aimed at beginners. 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