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Liar paradox

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656:"everything I am saying is false") Bhartrhari identifies a hidden parameter that can change unproblematic situations in daily communication into a stubborn paradox. Bhartrhari's solution can be understood in terms of the solution proposed in 1992 by Julian Roberts: "Paradoxes consume themselves. But we can keep apart the warring sides of the contradiction by the simple expedient of temporal contextualisation: what is 'true' with respect to one point in time need not be so in another ... The overall force of the 'Austinian' argument is not merely that 'things change', but that rationality is essentially temporal in that we need time in order to reconcile and manage what would otherwise be mutually destructive states." According to Robert's suggestion, it is the factor "time" which allows us to reconcile the separated "parts of the world" that play a crucial role in the solution of Barwise and Etchemendy. The capacity of time to prevent a direct confrontation of the two "parts of the world" is here external to the "liar". In the light of Bhartrhari's analysis, however, the extension in time that separates two perspectives on the world or two "parts of the world" – the part before and the part after the function accomplishes its task – is inherent in any "function": also the function to signify which underlies each statement, including the "liar". The unsolvable paradox – a situation in which we have either contradiction ( 749:. Then the theory at hand, which is assumed to prove certain facts about numbers, also proves facts about its own statements. Questions about the provability of statements are represented as questions about the properties of numbers, which would be decidable by the theory if it were complete. In these terms, the Gödel sentence states that no natural number exists with a certain, strange property. A number with this property would encode a proof of the inconsistency of the theory. If there were such a number then the theory would be inconsistent, contrary to the consistency hypothesis. So, under the assumption that the theory is consistent, there is no such number. 491:
discussing truth values to envision levels of languages, each of which can predicate truth (or falsehood) only of languages at a lower level. So, when one sentence refers to the truth-value of another, it is semantically higher. The sentence referred to is part of the "object language", while the referring sentence is considered to be a part of a "meta-language" with respect to the object language. It is legitimate for sentences in "languages" higher on the semantic hierarchy to refer to sentences lower in the "language" hierarchy, but not the other way around. This prevents a system from becoming self-referential.
826:. However, lacking the intelligence to realize the statement is a paradox, he simply responds, "Um, true. I'll go with true. There, that was easy." and is unaffected. Humorously, all other AIs present barring GLaDOS, all of which are significantly less sentient and lucid than both her and Wheatley, are still killed from hearing the paradox. However, GLaDOS later notes that she almost killed herself from her own attempt to kill Wheatley. 525:) is that every statement includes an implicit assertion of its own truth. Thus, for example, the statement "It is true that two plus two equals four" contains no more information than the statement "two plus two equals four", because the phrase "it is true that..." is always implicitly there. And in the self-referential spirit of the Liar Paradox, the phrase "it is true that..." is equivalent to "this whole statement is true and ...". 2398: 2388: 742:, Gödel used a modified version of the liar paradox, replacing "this sentence is false" with "this sentence is not provable", called the "Gödel sentence G". His proof showed that for any sufficiently powerful theory T, G is true, but not provable in T. The analysis of the truth and provability of G is a formalized version of the analysis of the truth of the liar sentence. 706:"A = false" is equivalent to "not A" and therefore the equation is not solvable. This is the motivation for reinterpretation of A. The simplest logical approach to make the equation solvable is the dialetheistic approach, in which case the solution is A being both "true" and "false". Other resolutions mostly include some modifications of the equation; 502:+1 which asserts that the first statement is false." This is a true, meaningful statement about the hierarchy that Tarski defines, but it refers to statements at every level of the hierarchy, so it must be above every level of the hierarchy, and is therefore not possible within the hierarchy (although bounded versions of the sentence are possible). 652:(late fifth century AD) dealt with paradoxes such as the liar in a section of one of the chapters of his magnum opus the Vākyapadīya. Bhartrhari's solution fits into his general approach to language, thought and reality, which has been characterized by some as "relativistic", "non-committal" or "perspectivistic". With regard to the liar paradox ( 849:, titled "Access Denied", the main character Jesse and their friends are captured by a supercomputer named PAMA. After PAMA controls two of Jesse's friends, Jesse learns that PAMA stalls when processing and uses a paradox to confuse him and escape with their last friend. One of the paradoxes the player can make Jesse say is the liar paradox. 137:(late fifth century AD) was well aware of a liar paradox which he formulated as "everything I am saying is false" (sarvam mithyā bravīmi). He analyzes this statement together with the paradox of "unsignifiability" and explores the boundary between statements that are unproblematic in daily life and paradoxes. 809:, the Doctor temporarily stumps the insane computer BOSS by asking it "If I were to tell you that the next thing I say would be true, but that the last thing I said was a lie, would you believe me?" BOSS tries to figure it out but cannot and eventually decides the question is irrelevant and summons security. 590:
propose that the liar sentence (which they interpret as synonymous with the Strengthened Liar) is ambiguous. They base this conclusion on a distinction they make between a "denial" and a "negation". If the liar means, "It is not the case that this statement is true", then it is denying itself. If it
90:, reportedly stated that "All Cretans are liars." However, Epimenides' statement that all Cretans are liars can be resolved as false, given that he knows of at least one other Cretan who does not lie (alternatively, it can be taken as merely a statement that all Cretans tell lies, not that they tell 490:
diagnosed the paradox as arising only in languages that are "semantically closed", by which he meant a language in which it is possible for one sentence to predicate truth (or falsehood) of another sentence in the same language (or even of itself). To avoid self-contradiction, it is necessary when
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If F is assumed to bear a truth value, then it presents the problem of determining the object of that value. But, a simpler version is possible, by assuming that the single word 'true' bears a truth value. The analogue to the paradox is to assume that the single word 'false' likewise bears a truth
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However, that the liar sentence can be shown to be true if it is false and false if it is true has led some to conclude that it is "neither true nor false". This response to the paradox is, in effect, the rejection of the claim that every statement has to be either true or false, also known as the
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recognized that Bhartrhari "wants to rise at once above all controversies by showing the conditions of possibility of any system of interpretation, rather than to prove the truth of a certain particular system" (Théorie de la connaissance et philosophie de la parole dans le brahmanisme classique,
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telling the truth or is he lying? If it is true that every man is a liar, and David's statement, "Every man is a liar" is true, then David also is lying; he, too, is a man. But if he, too, is lying, his statement that "Every man is a liar", consequently is not true. Whatever way you turn the
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Kripke proposes a solution in the following manner. If a statement's truth value is ultimately tied up in some evaluable fact about the world, that statement is "grounded". If not, that statement is "ungrounded". Ungrounded statements do not have a truth value. Liar statements and liar-like
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The multi-sentence version of the liar paradox generalizes to any circular sequence of such statements (wherein the last statement asserts the truth/falsity of the first statement), provided there are an odd number of statements asserting the falsity of their successor; the following is a
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For a better understanding of the liar paradox, it is useful to write it down in a more formal way. If "this statement is false" is denoted by A and its truth value is being sought, it is necessary to find a condition that restricts the choice of possible truth values of A. Because A is
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value, namely that it is false. This reveals that the paradox can be reduced to the mental act of assuming that the very idea of fallacy bears a truth value, namely that the very idea of fallacy is false: an act of misrepresentation. So, the symmetrical version of the paradox would be:
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is strengthened in order to make it amenable to more rigorous logical analysis. It is still generally called the "liar paradox" although abstraction is made precisely from the liar making the statement. Trying to assign to this statement, the strengthened liar, a classical binary
338:, where the truth values may only be the integer values 0 or 1. In this system, the statement "This statement is false" is no longer paradoxical as it can be assigned a truth value of 0.5, making it precisely half true and half false. A simplified explanation is shown below. 639:
has argued in favour of a non-cognitivist solution to the paradox, suggesting that some apparently well-formed sentences will turn out to be neither true nor false and that "formal criteria alone will inevitably prove insufficient" for resolving the paradox.
614:. Dialetheism is the view that there are true contradictions. Dialetheism raises its own problems. Chief among these is that since dialetheism recognizes the liar paradox, an intrinsic contradiction, as being true, it must discard the long-recognized 947:
St. Jerome, Homily on Psalm 115 (116B), translated by Sr. Marie Liguori Ewald, IHM, in The Homilies of Saint Jerome, Volume I (1-59 On the Psalms), The Fathers of the Church 48 (Washington, D.C.: The Catholic University of America Press, 1964),
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If (A) is false, then "This statement is false" is false. Therefore, (A) must be true. The hypothesis that (A) is false leads to the conclusion that (A) is true, another contradiction. Either way, (A) is both true and false, which is a paradox.
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The latter is a simple contradiction of the form "A and not A", and hence is false. There is therefore no paradox because the claim that this two-conjunct Liar is false does not lead to a contradiction. Eugene Mills presents a similar answer.
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is the statement of a liar that they are lying: for instance, declaring that "I am lying". If the liar is indeed lying, then the liar is telling the truth, which means the liar just lied. In "this sentence is a lie" the
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It is not possible to replace "not provable" with "false" in a Gödel sentence because the predicate "Q is the Gödel number of a false formula" cannot be represented as a formula of arithmetic. This result, known as
714:" and therefore A is false. In computational verb logic, the liar paradox is extended to statements like, "I hear what he says; he says what I don't hear", where verb logic must be used to resolve the paradox. 862:
Robert Earl Keen's song "The Road Goes On and On" alludes to the paradox. The song is widely believed to be written as part of Keen's feud with Toby Keith, who is presumably the "liar" Keen refers to.
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is credited with identifying this incompleteness in Tarski's hierarchy in his highly cited paper "Outline of a theory of truth," and it is recognized as a general problem in hierarchical languages.
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proposition, the conclusion is a contradiction. Since David himself is a man, it follows that he also is lying; but if he is lying because every man is a liar, his lying is of a different sort.
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Assume (D1) is false. Then (D2) is false. This would mean that (D1) is true. Thus (D1) is both true and false. Either way, (D1) is both true and false – the same paradox as (A) above.
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and other logicians, including J. C. Beall and Bradley Armour-Garb, have proposed that the liar sentence should be considered to be both true and false, a point of view known as
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If (A) is true, then "This statement is false" is true. Therefore, (A) must be false. The hypothesis that (A) is true leads to the conclusion that (A) is false, a contradiction.
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Assume (E1) is false. Then (E2) is true, which means (E3) is false, and hence (E1) is true. Either way, (E1) is both true and false – the same paradox as with (A) and (D1).
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propositions are true. Since trivialism is an intuitively false view, dialetheists nearly always reject the explosion principle. Logics that reject it are called
595:, that the "denial liar" can be true without contradiction while the "negation liar" can be false without contradiction. Their 1987 book makes heavy use of 779:
The liar paradox is occasionally used in fiction to shut down artificial intelligences, who are presented as being unable to process the sentence. In the
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If some statement, B, is assumed to be false, one writes, "B = false". The statement (C) that the statement B is false would be written as "C = 'B = false
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There are many other variants, and many complements, possible. In normal sentence construction, the simplest version of the complement is the sentence:
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If "this sentence is false" is true, then it is false, but the sentence states that it is false, and if it is false, then it must be true, and so on.
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John Buridan on Self-Reference : Chapter Eight of Buridan's Sophismata, with a Translation, and Introduction, and a Philosophical Commentary
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has, that the statement is both true and false. Nevertheless, even Priest's analysis is susceptible to the following version of the liar:
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argued that whether a sentence is paradoxical or not can depend upon contingent facts. If the only thing Smith says about Jones is
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The proposal that the statement is neither true nor false has given rise to the following, strengthened version of the paradox:
859:" alluded to the paradox when the narrator ends the song by stating "I'll lie again and again and I'll keep lying, I promise". 923: 781: 144:
for at least five centuries, starting from late 9th century, and apparently without being influenced by any other tradition.
109:, who lived in the 4th century BC. Eubulides reportedly asked, "A man says that he is lying. Is what he says true or false?" 79:(c. 600 BC) has been suggested as an example of the liar paradox, but they are not logically equivalent. The semi-mythical 2261: 734:
which state inherent limitations of sufficiently powerful axiomatic systems for mathematics. The theorems were proven by
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Assume (E1) is true. Then (E2) is false, which means (E3) is true, and hence (E1) is false, leading to a contradiction.
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However, this system is incomplete. One would like to be able to make statements such as "For every statement in level
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This is an equation from which the truth value of A = "this statement is false" could hopefully be obtained. In the
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Assume (D1) is true. Then (D2) is true. This would mean that (D1) is false. Therefore, (D1) is both true and false.
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soft on crime, then both Smith's remark about Jones and Jones's last remark about Smith are paradoxical.
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There are also multi-sentence versions of the liar paradox. The following is the two-sentence version:
1275:. Logic, Epistemology, and the Unity of Science. Vol. 36. Dordrecht: Springer. pp. 211–243. 334:, the truth value of a statement can be any real number between 0 and 1 both inclusive, as opposed to 2368: 2353: 2343: 2308: 2256: 2185: 2100: 1972: 1967: 1890: 1885: 1814: 1006:"Paradoxe et perspectivisme dans la philosophie de langage de Bhartrhari: langage, pensĂ©e et rĂ©alitĂ©" 106: 517:
asserts that there is nothing paradoxical about the liar paradox. His claim (which he attributes to
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Zach Weber, Guillermo Badia and Patrick Girard (2015). "What is an Inconsistent Truth Table?".
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means, "This statement is not true", then it is negating itself. They go on to argue, based on
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attempts to use the "this sentence is false" paradox to kill another artificial intelligence,
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in 1931, and are important in the philosophy of mathematics. Roughly speaking, in proving the
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HĂĄjek, P.; Paris, J.; Shepherdson, J. (Mar 2000). "The Liar Paradox and Fuzzy Logic".
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Jan E.M. Houben (1995). "Bhartrhari's solution to the Liar and some other paradoxes".
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has since sketched an alternative proof of the first incompleteness theorem that uses
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Crossley, J.N.; Ash, C.J.; Brickhill, C.J.; Stillwell, J.C.; Williams, N.H. (1972).
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three-sentence version, with each statement asserting the falsity of its successor:
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The problem of the liar paradox is that it seems to show that common beliefs about
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Glanzberg, Michael (2015-06-17). "Complexity and Hierarchy in Truth Predicates".
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to confuse and ultimately disable an android holding them captive. In the 1973
696:". Now, the liar paradox can be expressed as the statement A, that A is false: 1347: 799: 794: 649: 134: 83: 80: 31: 672:) and its extension in time, by accepting a simultaneous, opposite function ( 341:
Let the truth value of the statement "This statement is false" be denoted by
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ed. by Eli Franco and Karin Preisendanz, Amsterdam – Atlanta: Rodopi, 1997;
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The next thing I say to you will be true / The last thing I said was false.
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rather than the liar paradox to construct a true but unprovable formula.
177: 105:. One version of the liar paradox is attributed to the Greek philosopher 979: 1735: 1619: 1599:. MIT Press. Especially chapter 9. ISBN 0262611082, ISBN 978-0262611084 1226: 1141: 971: 786: 344: 173: 52: 1240: 1238: 1236: 1097: 1474: 1457: 819: 87: 1703: 1218: 1133: 1570:
Greenough, P. M. (2001). " Free Assumptions and the Liar Paradox,"
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The Logic of Reflection. German Philosophy in the Twentieth Century
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could have been the first logician to identify the liar paradox as
1671: 267:), the dialetheic approach can overcome this version of the Liar. 259:, it is a paradox. However, it has been argued that by adopting a 222:. Since this is what (B) itself states, it means that (B) must be 161: 125: 35: 1799: 1400: 830: 1707: 710:
claims that the equation should be "A = 'A = false and A = true
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statements are ungrounded, and therefore have no truth value.
1247:"Liar Paradox: Section 4.3.1 Tarski's hierarchy of languages" 745:
To prove the first incompleteness theorem, Gödel represented
1589:. Buridan's detailed solution to a number of such paradoxes. 1245:
Beall, Jc; Glanzberg, Michael; Ripley, David (2016-12-12) .
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Mills, Eugene (1998). "A simple solution to the Liar".
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and false, then (C) is only false. But then, it is not
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Another reaction to the paradox of (A) is to posit, as
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Jan E. M. Houben, "Bhartrhari's Perspectivism (1)" in
1385:. New York: Oxford University Press. pp. 6, 188. 1658:. A collection of logic puzzles exploring this theme. 1458:"Computational verb systems: The paradox of the liar" 1446:. New Haven and London: Yale University Press. p. 43. 689:
it is possible to give the condition by an equation.
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The simplest version of the paradox is the sentence:
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and Jones says only these three things about Smith:
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American Philosophical Quarterly 38/2, pp. 115-135.
1313:. MIT Press. section 9.6 "A. N. Prior's Solution". 1172:
Journal of Multiple-Valued Logic and Soft Computing
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This statement is true and this statement is false.
404:by generalizing the NOT operator to the equivalent 528:Thus the following two statements are equivalent: 471: 439: 393: 349: 1536:"Fightin' Words: Robert Earl Keen v. Toby Keith" 1163:Kehagias, Athanasios; Vezerides, K. (Aug 2006). 909:Epimenides paradox has "All Cretans are liars." 668:), when abstraction is made from this function ( 552:A majority of what Jones says about me is false. 498:of the hierarchy, there is a statement at level 118: 1367: 1365: 1201: 1199: 1719: 8: 1462:International Journal of Intelligent Systems 722: 1382:The Liar: An Essay on Truth and Circularity 1061:Andrew Irvine, "Gaps, Gluts, and Paradox", 2387: 1726: 1712: 1704: 1606:(1984). 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(D1) 7: 723:Gödel's first incompleteness theorem 263:relational semantics (as opposed to 1696:Stanford Encyclopedia of Philosophy 1677:Internet Encyclopedia of Philosophy 2044:What the Tortoise Said to Achilles 1077:Australasian Journal of Philosophy 648:The Indian grammarian-philosopher 133:The Indian grammarian-philosopher 112:The paradox was once discussed by 25: 1534:Cohen, Jason (January 25, 2012). 240:This statement is only false. (C) 97:The paradox's name translates as 2397: 2396: 2386: 1685:Beall, J C; Glanzberg, Michael. 1273:Unifying the Philosophy of Truth 730:are two fundamental theorems of 1407:from the original on 2020-04-22 1253:from the original on 2021-01-12 1185:from the original on 2021-07-08 1016:from the original on 2022-05-15 930:from the original on 2012-11-11 789:", the liar paradox is used by 755:Tarski's undefinability theorem 728:Gödel's incompleteness theorems 579:Jon Barwise and John Etchemendy 218:nor false, then it must be not 211:This statement is not true. (B) 186:A: This statement (A) is false. 1649:What Is the Name of This Book? 1608:Journal of Philosophical Logic 1063:Canadian Journal of Philosophy 926:. About.com (New York Times). 782:Star Trek: The Original Series 388: 382: 226:. 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Houben (2001). 924:"Paradoxes of Eubulides" 531:This statement is false. 412:, the statement becomes 394:{\displaystyle x=NOT(x)} 357:. The statement becomes 156:Explanation and variants 1963:Paradoxes of set theory 1503:Oxford University Press 1442:Roberts, Julian. 1992. 1348:10.1023/a:1004232928938 872:Hilbert–Bernays paradox 812:In the 2011 video game 660:) or infinite regress ( 561:Smith is soft on crime. 558:Smith is a big spender. 1577:Hughes, G. E. (1992). 837:, includes the lyrics 616:principle of explosion 519:Charles Sanders Peirce 473: 441: 395: 351: 199:principle of bivalence 131: 101:(ÏˆÎ”Ï…ÎŽÏŒÎŒÎ”ÎœÎżÏ‚ Î»ÏŒÎłÎżÏ‚) in 1456:Yang, T. (Sep 2001). 1336:Philosophical Studies 846:Minecraft: Story Mode 747:statements by numbers 654:sarvam mithyā bravÄ«mi 474: 472:{\displaystyle x=0.5} 442: 440:{\displaystyle x=1-x} 396: 352: 27:Paradoxical assertion 2329:Kavka's toxin puzzle 2101:Income and fertility 666:Bhartrhari's paradox 457: 419: 364: 345: 321:Possible resolutions 265:functional semantics 146:NaáčŁÄ«r al-DÄ«n al-áčŹĆ«sÄ« 107:Eubulides of Miletus 48:antinomy of the liar 1988:Temperature paradox 1911:Free choice paradox 1775:Fitch's knowability 1048:on August 16, 2011. 593:situation semantics 168:actually lead to a 2364:Prisoner's dilemma 2050:Heat death paradox 2038:Unexpected hanging 2003:Chicken or the egg 1620:10.1007/bf00453020 1505:. pp. 52–53. 1430:Madeleine Biardeau 1426:Beyond Orientalism 972:10.1007/bf01880219 882:Knights and Knaves 775:In popular culture 732:mathematical logic 469: 437: 391: 214:If (B) is neither 77:Epimenides paradox 2410: 2409: 2081:Arrow information 1670:Dowden, Bradley. 1645:Smullyan, Raymond 1597:Theories of Truth 1512:978-0-19-888087-5 1290:978-94-017-9672-9 922:Andrea Borghini. 680:Logical structure 295:E1 is false. (E3) 292:E3 is false. (E2) 289:E2 is false. (E1) 114:Jerome of Stridon 99:pseudĂłmenos lĂłgos 16:(Redirected from 2440: 2400: 2399: 2390: 2389: 2201:Service recovery 2055:Olbers's paradox 1755:Buridan's bridge 1728: 1721: 1714: 1705: 1700: 1691:Zalta, Edward N. 1681: 1631: 1593:Kirkham, Richard 1558: 1557: 1555: 1553: 1544:. Archived from 1531: 1525: 1524: 1494: 1488: 1487: 1477: 1475:10.1002/int.1049 1468:(9): 1053–1067. 1453: 1447: 1440: 1434: 1422: 1416: 1415: 1413: 1412: 1369: 1360: 1359: 1342:(2/3): 197–212. 1331: 1325: 1324: 1305:Kirkham, Richard 1301: 1295: 1294: 1268: 1262: 1261: 1259: 1258: 1242: 1231: 1230: 1203: 1194: 1193: 1191: 1190: 1184: 1178:(5–6): 539–559. 1169: 1160: 1154: 1153: 1117: 1111: 1110: 1100: 1072: 1066: 1059: 1050: 1049: 1047: 1040: 1031: 1025: 1024: 1022: 1021: 1001: 992: 991: 955: 949: 945: 939: 938: 936: 935: 919: 913: 907: 713: 695: 687:self-referential 478: 476: 475: 470: 446: 444: 443: 438: 400: 398: 397: 392: 356: 354: 353: 150:self-referential 38:, the classical 21: 2448: 2447: 2443: 2442: 2441: 2439: 2438: 2437: 2413: 2412: 2411: 2406: 2378: 2289:Decision-making 2235:Decision theory 2230: 2059: 1983:Hilbert's Hotel 1916:Grelling–Nelson 1859: 1738: 1732: 1684: 1669: 1666: 1661: 1602: 1566: 1561: 1551: 1549: 1533: 1532: 1528: 1513: 1496: 1495: 1491: 1455: 1454: 1450: 1441: 1437: 1423: 1419: 1410: 1408: 1393: 1377:John Etchemendy 1371: 1370: 1363: 1333: 1332: 1328: 1321: 1303: 1302: 1298: 1291: 1270: 1269: 1265: 1256: 1254: 1244: 1243: 1234: 1219:10.2307/2024634 1205: 1204: 1197: 1188: 1186: 1182: 1167: 1162: 1161: 1157: 1134:10.2307/2586541 1119: 1118: 1114: 1074: 1073: 1069: 1060: 1053: 1045: 1038: 1033: 1032: 1028: 1019: 1017: 1003: 1002: 995: 957: 956: 952: 946: 942: 933: 931: 921: 920: 916: 908: 904: 900: 868: 806:The Green Death 777: 769:Berry's paradox 725: 720: 711: 700: 699:A = "A = false" 693: 682: 646: 634: 632:Non-cognitivism 605: 588:John Etchemendy 581: 565: 562: 559: 553: 544: 535: 532: 512: 485: 455: 454: 417: 416: 362: 361: 343: 342: 328: 323: 318: 315: 308: 296: 293: 290: 277: 274: 255:and is now not 243:If (C) is both 241: 212: 187: 158: 73: 28: 23: 22: 15: 12: 11: 5: 2446: 2444: 2436: 2435: 2430: 2425: 2415: 2414: 2408: 2407: 2405: 2404: 2394: 2383: 2380: 2379: 2377: 2376: 2371: 2366: 2361: 2356: 2351: 2346: 2341: 2336: 2331: 2326: 2321: 2316: 2311: 2306: 2301: 2296: 2291: 2286: 2281: 2276: 2271: 2266: 2265: 2264: 2259: 2254: 2244: 2238: 2236: 2232: 2231: 2229: 2228: 2223: 2218: 2213: 2208: 2206:St. Petersburg 2203: 2198: 2193: 2188: 2183: 2178: 2173: 2168: 2163: 2158: 2153: 2148: 2143: 2138: 2133: 2128: 2123: 2118: 2113: 2108: 2103: 2098: 2093: 2088: 2083: 2078: 2073: 2067: 2065: 2061: 2060: 2058: 2057: 2052: 2047: 2040: 2035: 2030: 2025: 2020: 2015: 2010: 2005: 2000: 1995: 1990: 1985: 1980: 1975: 1970: 1965: 1960: 1955: 1954: 1953: 1948: 1943: 1938: 1933: 1923: 1918: 1913: 1908: 1903: 1898: 1893: 1888: 1883: 1878: 1873: 1867: 1865: 1861: 1860: 1858: 1857: 1852: 1847: 1842: 1837: 1835:Rule-following 1832: 1827: 1822: 1817: 1812: 1807: 1802: 1797: 1792: 1787: 1782: 1777: 1772: 1767: 1762: 1760:Dream argument 1757: 1752: 1746: 1744: 1740: 1739: 1733: 1731: 1730: 1723: 1716: 1708: 1702: 1701: 1687:"Liar Paradox" 1682: 1672:"Liar Paradox" 1665: 1664:External links 1662: 1660: 1659: 1642: 1632: 1614:(2): 153–179. 1604:Priest, Graham 1600: 1590: 1575: 1567: 1565: 1562: 1560: 1559: 1526: 1511: 1489: 1448: 1435: 1417: 1391: 1361: 1326: 1319: 1296: 1289: 1263: 1232: 1209:(1975-11-06). 1195: 1155: 1128:(1): 339–346. 1112: 1067: 1051: 1026: 993: 966:(4): 381–401. 950: 940: 914: 901: 899: 896: 895: 894: 892:Self-reference 889: 884: 879: 874: 867: 864: 855:'s 1994 song " 776: 773: 724: 721: 719: 716: 704:Boolean domain 698: 681: 678: 645: 642: 633: 630: 625:paraconsistent 604: 601: 580: 577: 563: 560: 557: 551: 543: 540: 533: 530: 511: 508: 484: 481: 480: 479: 468: 465: 462: 448: 447: 436: 433: 430: 427: 424: 406:Zadeh operator 402: 401: 390: 387: 384: 381: 378: 375: 372: 369: 348: 327: 324: 322: 319: 316: 313: 306: 294: 291: 288: 275: 272: 239: 210: 185: 157: 154: 72: 69: 44:liar's paradox 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2445: 2434: 2431: 2429: 2426: 2424: 2421: 2420: 2418: 2403: 2395: 2393: 2385: 2384: 2381: 2375: 2372: 2370: 2367: 2365: 2362: 2360: 2357: 2355: 2352: 2350: 2347: 2345: 2342: 2340: 2337: 2335: 2334:Morton's fork 2332: 2330: 2327: 2325: 2322: 2320: 2317: 2315: 2312: 2310: 2307: 2305: 2302: 2300: 2297: 2295: 2292: 2290: 2287: 2285: 2282: 2280: 2277: 2275: 2274:Buridan's ass 2272: 2270: 2267: 2263: 2260: 2258: 2255: 2253: 2250: 2249: 2248: 2247:Apportionment 2245: 2243: 2240: 2239: 2237: 2233: 2227: 2224: 2222: 2219: 2217: 2214: 2212: 2209: 2207: 2204: 2202: 2199: 2197: 2194: 2192: 2189: 2187: 2184: 2182: 2179: 2177: 2174: 2172: 2169: 2167: 2164: 2162: 2159: 2157: 2154: 2152: 2149: 2147: 2144: 2142: 2139: 2137: 2134: 2132: 2129: 2127: 2124: 2122: 2119: 2117: 2114: 2112: 2109: 2107: 2106:Downs–Thomson 2104: 2102: 2099: 2097: 2094: 2092: 2089: 2087: 2084: 2082: 2079: 2077: 2074: 2072: 2069: 2068: 2066: 2062: 2056: 2053: 2051: 2048: 2045: 2041: 2039: 2036: 2034: 2031: 2029: 2026: 2024: 2023:Plato's beard 2021: 2019: 2016: 2014: 2011: 2009: 2006: 2004: 2001: 1999: 1996: 1994: 1991: 1989: 1986: 1984: 1981: 1979: 1976: 1974: 1971: 1969: 1966: 1964: 1961: 1959: 1956: 1952: 1949: 1947: 1944: 1942: 1939: 1937: 1934: 1932: 1929: 1928: 1927: 1924: 1922: 1921:Kleene–Rosser 1919: 1917: 1914: 1912: 1909: 1907: 1904: 1902: 1899: 1897: 1894: 1892: 1889: 1887: 1884: 1882: 1879: 1877: 1874: 1872: 1869: 1868: 1866: 1862: 1856: 1853: 1851: 1848: 1846: 1845:Theseus' ship 1843: 1841: 1838: 1836: 1833: 1831: 1828: 1826: 1823: 1821: 1818: 1816: 1813: 1811: 1808: 1806: 1805:Mere addition 1803: 1801: 1798: 1796: 1793: 1791: 1788: 1786: 1783: 1781: 1778: 1776: 1773: 1771: 1768: 1766: 1763: 1761: 1758: 1756: 1753: 1751: 1748: 1747: 1745: 1743:Philosophical 1741: 1737: 1729: 1724: 1722: 1717: 1715: 1710: 1709: 1706: 1698: 1697: 1692: 1688: 1683: 1679: 1678: 1673: 1668: 1667: 1663: 1657: 1656:0-671-62832-1 1653: 1650: 1646: 1643: 1640: 1636: 1633: 1629: 1625: 1621: 1617: 1613: 1609: 1605: 1601: 1598: 1594: 1591: 1588: 1587:0-521-28864-9 1584: 1580: 1576: 1573: 1569: 1568: 1563: 1548:on 2015-10-03 1547: 1543: 1542: 1541:Texas Monthly 1537: 1530: 1527: 1522: 1518: 1514: 1508: 1504: 1500: 1493: 1490: 1485: 1481: 1476: 1471: 1467: 1463: 1459: 1452: 1449: 1445: 1439: 1436: 1431: 1427: 1421: 1418: 1406: 1402: 1398: 1394: 1392:9780195059441 1388: 1384: 1383: 1378: 1374: 1368: 1366: 1362: 1357: 1353: 1349: 1345: 1341: 1337: 1330: 1327: 1322: 1320:0-262-61108-2 1316: 1312: 1311: 1306: 1300: 1297: 1292: 1286: 1282: 1278: 1274: 1267: 1264: 1252: 1248: 1241: 1239: 1237: 1233: 1228: 1224: 1220: 1216: 1212: 1208: 1202: 1200: 1196: 1181: 1177: 1173: 1166: 1159: 1156: 1151: 1147: 1143: 1139: 1135: 1131: 1127: 1123: 1116: 1113: 1108: 1104: 1099: 1094: 1090: 1086: 1082: 1078: 1071: 1068: 1064: 1058: 1056: 1052: 1044: 1037: 1030: 1027: 1015: 1011: 1007: 1000: 998: 994: 989: 985: 981: 977: 973: 969: 965: 961: 954: 951: 944: 941: 929: 925: 918: 915: 912: 906: 903: 897: 893: 890: 888: 885: 883: 880: 878: 875: 873: 870: 869: 865: 863: 860: 858: 854: 850: 848: 847: 841: 840: 836: 832: 827: 825: 821: 817: 816: 810: 808: 807: 802: 801: 796: 792: 788: 784: 783: 774: 772: 770: 766: 765:George Boolos 762: 760: 759:Alfred Tarski 756: 750: 748: 743: 741: 737: 733: 729: 717: 715: 709: 705: 697: 690: 688: 679: 677: 675: 674:apara vyāpāra 671: 667: 663: 659: 655: 651: 641: 638: 637:Andrew Irvine 631: 629: 627: 626: 621: 617: 613: 609: 608:Graham Priest 602: 600: 598: 594: 589: 585: 578: 576: 572: 570: 556: 550: 548: 541: 539: 529: 526: 524: 520: 516: 509: 507: 505: 501: 497: 492: 489: 488:Alfred Tarski 483:Alfred Tarski 482: 466: 463: 460: 453: 452: 451: 434: 431: 428: 425: 422: 415: 414: 413: 411: 407: 385: 379: 376: 373: 370: 367: 360: 359: 358: 346: 339: 337: 336:Boolean logic 333: 325: 320: 312: 305: 302: 299: 287: 283: 280: 271: 268: 266: 262: 258: 254: 250: 246: 238: 236: 235:Graham Priest 231: 229: 225: 221: 217: 209: 206: 204: 200: 194: 190: 184: 181: 179: 175: 171: 170:contradiction 167: 163: 155: 153: 151: 147: 143: 138: 136: 130: 127: 123: 117: 116:in a sermon: 115: 110: 108: 104: 103:Ancient Greek 100: 95: 93: 89: 85: 82: 78: 70: 68: 65: 63: 62:contradiction 59: 54: 49: 45: 41: 37: 33: 19: 2354:Preparedness 2186:Productivity 2166:Mandeville's 1958:Opposite Day 1925: 1886:Burali-Forti 1881:Bhartrhari's 1694: 1675: 1648: 1641:. Duckworth. 1638: 1611: 1607: 1596: 1578: 1571: 1550:. Retrieved 1546:the original 1539: 1529: 1498: 1492: 1465: 1461: 1451: 1443: 1438: 1425: 1420: 1409:. Retrieved 1381: 1339: 1335: 1329: 1308: 1299: 1272: 1266: 1255:. Retrieved 1210: 1207:Kripke, Saul 1187:. Retrieved 1175: 1171: 1158: 1125: 1121: 1115: 1080: 1076: 1070: 1062: 1043:the original 1029: 1018:. Retrieved 1009: 963: 959: 953: 943: 932:. Retrieved 917: 905: 861: 853:Rollins Band 851: 844: 842: 838: 834: 828: 813: 811: 804: 798: 791:Captain Kirk 780: 778: 763: 751: 744: 726: 718:Applications 708:Arthur Prior 701: 691: 683: 673: 669: 661: 657: 653: 647: 635: 623: 619: 606: 582: 573: 568: 566: 554: 545: 536: 527: 523:John Buridan 515:Arthur Prior 513: 510:Arthur Prior 499: 495: 493: 486: 449: 403: 340: 329: 309: 303: 300: 297: 284: 281: 278: 269: 256: 252: 248: 244: 242: 232: 227: 223: 219: 215: 213: 207: 195: 191: 188: 182: 159: 139: 132: 119: 111: 98: 96: 91: 74: 66: 47: 43: 40:liar paradox 39: 29: 18:Liar Paradox 2284:Condorcet's 2136:Giffen good 2096:Competition 1850:White horse 1825:Omnipotence 1635:A. N. Prior 1373:Jon Barwise 877:Insolubilia 835:Enough Said 612:dialetheism 603:Dialetheism 584:Jon Barwise 547:Saul Kripke 542:Saul Kripke 504:Saul Kripke 410:fuzzy logic 332:fuzzy logic 326:Fuzzy logic 60:leads to a 58:truth value 2417:Categories 2359:Prevention 2349:Parrondo's 2339:Navigation 2324:Inventor's 2319:Hedgehog's 2279:Chainstore 2262:Population 2257:New states 2191:Prosperity 2171:Mayfield's 2013:Entailment 1993:Barbershop 1906:Epimenides 1564:References 1521:0251.02001 1411:2016-02-22 1257:2021-01-16 1189:2021-02-17 1098:2292/30988 1020:2018-08-04 934:2012-09-04 911:Titus 1:12 800:Doctor Who 795:Harry Mudd 736:Kurt Gödel 650:Bhartrhari 261:two-valued 135:Bhartrhari 84:Epimenides 32:philosophy 2374:Willpower 2369:Tolerance 2344:Newcomb's 2309:Fredkin's 2196:Scitovsky 2116:Edgeworth 2111:Easterlin 2076:Antitrust 1973:Russell's 1968:Richard's 1941:Pinocchio 1896:Crocodile 1815:Newcomb's 1785:Goodman's 1780:Free will 1765:Epicurean 1736:paradoxes 1356:169981769 1107:170137819 988:170337976 785:episode " 662:anavasthā 432:− 2402:Category 2299:Ellsberg 2151:Leontief 2131:Gibson's 2126:European 2121:Ellsberg 2091:Braess's 2086:Bertrand 2064:Economic 1998:Catch-22 1978:Socratic 1820:Nihilism 1790:Hedonism 1750:Analysis 1734:Notable 1647:(1986). 1637:(1976). 1595:(1992). 1552:July 12, 1484:41448750 1405:Archived 1401:86031260 1379:(1989). 1307:(1992). 1251:Archived 1180:Archived 1083:(3): 7. 1014:Archived 980:23447805 928:Archived 866:See also 824:Wheatley 815:Portal 2 178:semantic 2304:Fenno's 2269:Arrow's 2252:Alabama 2242:Abilene 2221:Tullock 2176:Metzler 2018:Lottery 2008:Drinker 1951:Yablo's 1946:Quine's 1901:Curry's 1864:Logical 1840:Sorites 1830:Preface 1810:Moore's 1795:Liberal 1770:Fiction 1693:(ed.). 1628:2442524 1227:2024634 1150:6865763 1142:2586541 803:serial 787:I, Mudd 670:vyāpāra 658:virodha 180:rules. 174:grammar 166:falsity 94:lies). 71:History 53:paradox 2211:Thrift 2181:Plenty 2156:Lerner 2146:Jevons 2141:Icarus 2071:Allais 2033:Ross's 1871:Barber 1855:Zeno's 1800:Meno's 1654:  1626:  1585:  1519:  1509:  1482:  1399:  1389:  1354:  1317:  1287:  1225:  1148:  1140:  1105:  986:  978:  833:song, 820:GLaDOS 88:Cretan 2428:Lying 2314:Green 2294:Downs 2226:Value 2161:Lucas 2028:Raven 1936:No-no 1891:Court 1876:Berry 1689:. In 1624:S2CID 1480:S2CID 1352:S2CID 1223:JSTOR 1183:(PDF) 1168:(PDF) 1146:S2CID 1138:JSTOR 1103:S2CID 1046:(PDF) 1039:(PDF) 984:S2CID 976:JSTOR 898:Notes 408:from 162:truth 126:David 124:" Is 36:logic 2392:List 2216:Toil 1931:Card 1926:Liar 1652:ISBN 1583:ISBN 1554:2021 1507:ISBN 1397:LCCN 1387:ISBN 1315:ISBN 1285:ISBN 857:Liar 831:Devo 829:The 793:and 586:and 521:and 257:true 253:true 249:true 245:true 228:true 224:true 220:true 216:true 176:and 164:and 92:only 86:, a 81:seer 75:The 34:and 1616:doi 1517:Zbl 1470:doi 1344:doi 1277:doi 1215:doi 1130:doi 1093:hdl 1085:doi 968:doi 948:294 620:all 569:not 467:0.5 330:In 46:or 42:or 30:In 2419:: 1674:. 1622:. 1612:13 1610:. 1538:. 1515:. 1478:. 1466:16 1464:. 1460:. 1403:. 1395:. 1375:; 1364:^ 1350:. 1340:89 1338:. 1283:. 1249:. 1235:^ 1221:. 1198:^ 1176:12 1174:. 1170:. 1144:. 1136:. 1126:61 1124:. 1101:. 1091:. 1081:94 1079:. 1054:^ 996:^ 982:. 974:. 964:23 962:. 761:. 628:. 599:. 205:. 152:. 64:. 2046:" 2042:" 1727:e 1720:t 1713:v 1699:. 1680:. 1630:. 1618:: 1574:: 1556:. 1523:. 1486:. 1472:: 1414:. 1358:. 1346:: 1323:. 1293:. 1279:: 1260:. 1229:. 1217:: 1192:. 1152:. 1132:: 1109:. 1095:: 1087:: 1023:. 990:. 970:: 937:. 712:' 694:' 500:α 496:α 464:= 461:x 435:x 429:1 426:= 423:x 389:) 386:x 383:( 380:T 377:O 374:N 371:= 368:x 350:x 347:x 120:" 20:)

Index

Liar Paradox
philosophy
logic
paradox
truth value
contradiction
Epimenides paradox
seer
Epimenides
Cretan
Ancient Greek
Eubulides of Miletus
Jerome of Stridon
I said in my alarm, Every man is a liar!
David
Bhartrhari
liar paradox in early Islamic tradition
NaáčŁÄ«r al-DÄ«n al-áčŹĆ«sÄ«
self-referential
truth
falsity
contradiction
grammar
semantic
principle of bivalence
law of the excluded middle
Graham Priest
two-valued
functional semantics
fuzzy logic

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