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'''Paradoks''' adalah sebuah pernyataan yang seolah-olah bertentangan atau berlawanan dengan [[asumsi]] umum, tetapi dalam [[Fakta|kenyataannya]] mengandung sebuah kebenaran. Dalam [[ilmu]] [[sastra]], paradoks termasuk ke dalam kategori ketidaklangsungan [[ekspresi]] yang berwujud penyimpangan arti.<ref>{{Cite web|last=Saptoyo|first=Rosy Dewi Arianti|date=2020-11-11|title=Contoh Majas Paradoks|url=https://www.kompas.com/skola/read/2020/11/11/170001769/contoh-majas-paradoks|website=KOMPAS.com|language=id|access-date=2022-01-05}}</ref> Umumnya, kata paradoks sering kali digunakan dengan kontradiksi, tetapi sebuah kontradiksi oleh definisi yang tidak benar. Banyak sekali paradoks yang memiliki sebuah jawaban, meskipun tetap tidak bisa terpecahkan atau hanya bisa dipecahkan dengan perdebatan.<ref>{{Cite web|last=Nugraha|first=Jevi|date=2021-05-18|title=Paradoks Adalah Pendapat yang Bertentangan, Berikut Penjelasan dan Contohnya|url=https://www.merdeka.com/jateng/paradoks-adalah-pendapat-yang-bertentangan-berikut-penjelasan-dan-contohnya-kln.html|website=merdeka.com|language=en|access-date=2021-12-07}}</ref> Kata paradoks berasal dari [[bahasa]] [[Yunani]] ''paradoxon''. Istilah tersebut memiliki arti ''contrary to expectations, existing belief or perceived opinion (bertentangan dengan harapan, keyakinan yang ada atau pendapat yang dirasakan)''. Paradoks adalah suatu [[gaya bahasa]] yang menarik karena mengajak pembaca untuk berpikir lebih luas dan [[kritis]] terhadap ungkapan yang disampaikan.<ref>{{Cite web|last=|first=|date=2021-10-24|title=Majas Paradoks: Kekacauan yang Menarik|url=https://www.bernaspos.com/majas-paradoks|website=Bernaspos.com|language=id|access-date=2021-12-07}}</ref>
[[Image:Boyle'sSelfFlowingFlask.png|thumb|Corong mengalir terus [[Robert Boyle]] mengisi dirinya sendiri, tetapi [[gerakan perpetual]] tidak ada.]]
Paradoks dijadikan sebuah [[media]] untuk menyampaikan pernyataan [[retorik]] yang menyiratkan pertentangan tetapi sesungguhnya berisi kebenaran. Paradoks bisa menarik perhatian pembaca karena mereka harus menelaah proposisi bertentangan yang [[eksplisit]] atau [[implisit]]. Paradoks dapat merangkum [[imajinasi]], [[realitas]] dan [[polemik]]. Sehingga, jika dirangkum secara keseluruhan, paradoks mempunyai ciri khas yang unik karena berbeda dari [[majas]] lainnya dalam hal penyajian pertentangan yang bisa memberi efek kejut karena preposisi dan makna dibalik pertentangan yang dideskripsikan.<ref>{{Cite journal|last=Jayantini|first=I Gusti Agung Sri Rwa|last2=Umbas|first2=Ronald|last3=Lestari|first3=Ni Nyoman Ayu Dewi|date=2020|title=Paradoks dalam Antologi Puisi Rupi Kaur The Sun and Her Flowers|url=https://ejournal.bsi.ac.id/ejurnal/index.php/wanastra/article/download/8591/4272|journal=Wanastra : Jurnal Bahasa dan Sastra|volume=12|issue=2|pages=143|issn=25793438}}</ref>
Sebuah '''paradoks'' adalah sebuah pernyataan yang [[betul]] atau sekelompok pernyataan yang menuju ke sebuah [[kontradiksi]] atau ke sebuah situasi yang berlawanan dengan intuisi. Biasanya, baik pernyataan dalam pertanyaan tidak termasuk kontradiksi, hasil yang membingungkan bukan sebuah kontradiksi, atau "premis"nya tidak sepenuhnya betul (atau, tidak dapat semuanya betul). Pengenalan [[ambiguitas]], [[equivocation]], dan perkiraan yang tak diutarakan di paradoks yang dikenal sering kali menuju ke peningkatan dalam [[sains]], [[filsafat]], dan [[matematika]].
== Contoh ==
Kata ''paradoks'' seringkali digunakan dengan ''kontradiksi'', tetapi sebuah kontradiksi oleh definisi tidak dapat benar, banyak paradoks dapat memiliki sebuah jawaban, meskipun banyak yang tetap tak terpecahkan, atau hanya terpecahkan dengan perdebatan (seperti [[paradoks Curry]]). Dan juga istilah ini digunakan untuk situasi yang mengejutkan seperti [[paradoks Ulang Tahun]]. Ini juga digunakan dalam [[ekonomi]], di mana sebuah paradoks adalah sebuah hasil tidak intuitif dari teori ekonomi.
=== ''Grandfather paradox'' ===
[[Etimologi]] ''paradoks'' dapat ditelusuri kembali ke [[Renaissance]]. Bentuk awal dari kata ini muncul dalam bahasa Latin ''paradoxum'' dan berhubungan dengan bahasa Yunani ''paradoxon''. Kata ini terdiri dari preposisi ''para'' yang berarti "dengan cara", atau "menurut" digabungkan dengan nama benda ''doxa'', yang berarti "apa yang diterima". Bandingkan dengan [[ortodoks]] (secara harafiah "pengajaran langsung") dan [[heterodoks]] (secara harafiah "ajaran berbeda"). Paradoks pembohong dan paradoks lainnya dipelajari dalam jaman pertengahan di bawah [[insolubilia]].
Teori ini menerangkan perjalanan [[waktu]] ke masa lalu untuk bertemu dan membunuh seorang [[kakek]]. Jika kakek terbunuh pada masa sebelum [[ayah]] atau [[ibu]] lahir atau sebelum kakek bertemu dengan [[nenek]], maka ayah atau ibu tidak pernah dilahirkan ke dunia.
Dampaknya adalah tidak akan pernah dilahirkan dan tidak akan pernah melakukan perjalanan waktu ke masa lalu untuk membunuh kakek. Lalu, jika tidak pernah melaksanakan perjalanan waktu ke masa lalu untuk membunuh kakek, kakek hidup, ayah atau ibu pasti dilahirkan dan seorang anak pun akan terlahir.<ref name=":0">{{Cite web|last=Hany|first=Arief|last2=|first2=|date=30 Maret 2021|title=5 Paradoks Ini Akan Membuat Otakmu Berpikir Keras|url=https://www.idntimes.com/hype/fun-fact/arief-hany/5-paradox-ini-akan-membuat-kepala-kita-pusing-c1c2|website=IDN Times|language=id|access-date=2021-12-07}}</ref>
Tema umum dalam paradoks termasuk referensi-sendiri yang langsung dan tak langsung, tak terhingga, definisi berputar, dan tingkatan alasan yang membingungkan. Paradoks yang tidak berdasarkan dalam sebuah "error" tersembunyi biasanya terjadi di pinggiran [[konteks]] atau [[bahasa]], dan membutuhkan pengembangan konteks (atau bahasa) untuk menghilangkan kualitas paradoks mereka.
=== ''Predestination Paradox'' ===
Dalam [[filosofi moral]], paradoks memainkan peranan pusat dalam debat tentang [[etik]]. Misalnya, peringatan etis untuk "mencintai tetangga anda" adalah tidak hanya kontras dengan, tetapi berkontradiksi kepada tetangga bersenjata yang giat mencoba membunuh anda: bila dia berhasil, anda tidak akan berhasil untuk mencintainya. Tetapi untuk menyerang mereka terlebih dahulu atau menahan mereka biasanya tidak dimengerti sebagai tindakan cinta. Ini dapat disebut sebagai [[dilema etik]]. Contoh lainnya, adalah konflik antara perintah untuk tidak mencuri dan untuk memberi perhatian kepada keluarga yang anda tidak mampu memberi mereka makan tanpa mencuri uang.
Teori paradoks ini menggambarkan sesuatu yang ditakdirkan terjadi atau sudah pasti akan terjadi. Dalam paradoks ''predestination'', bisa menciptakan perubahan di masa lalu tapi tidak dapat mengubah suatu hal yang di[[takdir]]kan terjadi di [[masa]] yang akan datang.
=== ''Bootstrap Paradox'' ===
==Jenis-jenis paradoks==
''Bootstrap'' adalah paradoks yang mengakibatkan tidak jelasanya suatu [[objek]] atau [[efek]] objek sebagai sebuah perjalanan waktu. Sebagai contoh di masa sekarang ada seorang [[ilmuwan]] membaca [[gagasan]] [[ide]] mengenai teori [[relativitas]] [[Einstein]]. Lalu mencoba melakukan perjalanan waktu agar bisa kembali ke masa lalu dan mengajarkan teori kepada Einstein jauh sebelum ia menemukan teori tersebut. Lantas terdapat pertanyaan, siapa penemu teori itu? Jika itu jawabannya, tentu mustahil karena membaca [[ide]] yang diciptakan oleh Einstein. Namun jika Einstein adalah penemu hal tersebut, tentu juga mustahil karena ia diajarkan kembali ke masa lalu.
=== ''Kidnapper Paradox'' ===
[[W. V. Quine]] (1962) mengelompokkan paradoks menjadi tiga:
''Kidnapper paradox'' diumpamakan sebagai suatu tebak-tebakan yang dilakukan penculik kepada Ayah yang diculik. Penculik berkata kepada sang Ayah yang anaknya diculik, “Jika kau dapat menebak apa yang aku akan lakukan nanti maka aku akan mengembalikan anakmu“ Dan sang ayah menebak "Aku tebak, kau tidak akan mengembalikan anak itu.” Penculik sangat menyesal dengan permainan tebak-tebakannya, sebab seorang Ayah berhasil menebak apa yang akan dilakukan. Artinya, anak tersebut harus tetap dikembalikan. Namun, jika dikembalikan maka tebakan Ayah sudah salah.<ref name=":0" />
* A ''paradoks veridical'' produces a result that appears absurd but is demonstrated to be true nevertheless. Thus, the paradox of Frederic's birthday in ''[[The Pirates of Penzance]]'' establishes the surprising fact that a person may be more than N years old on his Nth birthday. Likewise, [[Arrow's impossibility theorem]] involves behaviour of voting systems that is surprising but all too true.
* A ''falsidical paradox'' establishes a result that not only appears false but actually is false; there is a fallacy in the supposed demonstration. The various [[invalid proof]]s (e.g. that 1 = 2) are classic examples, generally relying on a hidden division by zero. Another example would be the [[Horse paradox]].
* A paradox which is in neither class may be an ''antinomy'', which reaches a self-contradictory result by properly applying accepted ways of reasoning. For example, the [[Grelling-Nelson paradox]] points out genuine problems in our understanding of the ideas of truth and description.
=== ''Butterfly Effect Paradox'' ===
== Daftar paradoks ==
''Butterfly Effect Paradox'' adalah efek paradoks yang diciptakan dari sebuah perjalanan waktu. Konsekuensi perjalanan waktu dan tindakan yang dilakukan di masa lalu dapat menyebabkan efek skala besar di masa yang akan mendatang.
Misalnya, ada seorang penggemar [[film]] “[[Star Wars]]” dan “[[Indiana Jones]]”. Kemudian penggemar melakukan perjalanan ke masa lampau untuk bertemu dengan seorang[[George Lucas]]. Namun, hal itu membuatnya berhenti belajar di sebuah sekolah film hingga berdampak pada masa depan. Hal itu membuat film “[[Star Wars]]” dan “[[Indiana Jones]]” tidak pernah diproduksi dan [[teknologi]] yang telah tercipta karena inspirasi dari film yang pernah ada.<ref name=":0" />
Quine's classification, of course, is useful only once a paradox has a clear resolution. That question is treated on the page for each individual paradox; the following are grouped thematically.
=== [[Logika]]Rujukan ===
[[Kategori:Paradoks| ]]
[[Kategori:Majas]]
[[Kategori:Logika]]
[[Kategori:Silogisme tidak sempurna]]
<references />{{Col|2}}
;Logika
* [[Paradoks hukuman gantung tidak terduga]]
* [[Paradoks Epimenides]]
* [[Paradoks kartu]]
* [[Paradoks tukang cukur]]
* [[Hari Kebalikan]]
* [[Paradoks Pinokio]]
* [[Dilema buaya]]
;Matematika
* [[Paradox of entailment]]: Inconsistent premises always make an argument valid.
* [[Paradoks garis pantai]]
* [[Raven paradox]] (or Hempel's Ravens): Observing a red apple increases the likelihood of all ravens being black.
;Biologi
* [[Horse paradox]]: All horses are the same colour.
* [[Paradoks Peto]]
* [[Unexpected hanging paradox]]: The day of the hanging will be a surprise, so it cannot happen at all, so it will be a surprise. <!--* [[Voting paradox]] (Condorcet paradox): Non-transitive collective preferences. --> <!-- identical to Arrow's, right? -->
;Fisika
* [[Barber paradox]]: The adult male barber who shaves all men who do not shave themselves, and no-one else. (A close relative of [[Russell's paradox]].)
* [[Paradoks kepunahan]]
* [[Richard's paradox]]: We appear to be able to use simple English to define a decimal expansion in a way which is self-contradictory.
;Teori keputusan
====* [[Paradoks semantikkekuatan ====kehendak]]
{{EndDiv}}
These form a well-known (and well-studied) class having in common that any permissible assignment of semantic value (truth, reference) to an expression immediately implies the assignment of a different value.
* [[Berry paradox]]: What is "The first number not nameable in under ten words"? (And has it not just been named in nine?)
* [[Curry's paradox]]: "If I'm not mistaken, the world will end in a week."
* [[Epimenides paradox]]: A Cretan says "All Cretans are liars".
* [[Grelling-Nelson paradox]]: Is the word "heterological", meaning "not applicable to itself," a heterological word?
* [[Liar paradox]]: "This sentence is false."
* [[Quine's liar paradox]]: "Yields a falsehood when appended to its own quotation."
* [[Russell's paradox]]: Does the set of all those sets that do not contain themselves contain itself?
* The [[Y combinator]] in the [[lambda calculus]] and [[combinatory logic]] has been called the [[paradoxical combinator]] since it is related to the self-referential antinomies.
* [[Missing Dollar Paradox]]: Faulty logic makes it appear as if a dollar from a restaurant bill has gone missing. Not in the same class as the others.
==== Kerancuan ====
* [[Ship of Theseus]]/[[George Washington's axe]]: When every component of the ship has been replaced at least once, is it still the same ship?
* [[Sorites paradox]]: At what point does a heap stop being a heap as I take away grains of sand? Alternately, at what point does someone become bald?
===[[Matematika]] dan [[statistika]]===
[[Image:Monty-hall.png|thumb|right|The [[Monty Hall problem|Monty Hall paradox]]: which door do you choose?]]
* [[Apportionment paradox]]: Some systems of apportioning representation can have unintuitive results
** [[Alabama paradox]]
** [[New states paradox]]
** [[Population paradox]]
* [[Will Rogers phenomenon]]: the mathematical concept of an [[average]], whether defined as the [[mean]] or [[median]], leads to apparently paradoxical results - for example, it is possible that moving an entry from [[Wikipedia]] to [[Wiktionary]] would increase the average entry length on '''both''' sites
* [[Berkson's paradox]]
* [[Bertrand's paradox (probability)]]: Different common-sense definitions of randomness give quite different results.
* [[Birthday paradox]]: What is the chance that two people in a room have the same birthday?
* [[Borel's paradox]]: Conditional probability density functions are not invariant under coordinate transformations.
* [[Elevator paradox]]: Elevators can seem to be mostly going in one direction, as if they were being manufactured in the middle of the building and being disassembled on the roof and basement.
* [[Hodgson's paradox]]: the ratio of two Gaussian random variables has neither mean nor variance.
* [[Richard's paradox]]: A complete list of definitions of real numbers do not exist.
* [[Monty Hall problem]]: An unintuitive consequence of conditional probability.
* [[Simpson's paradox]]: An association in sub-populations may be reversed in the population. It appears that two sets of data separately support a certain hypothesis, but, when considered together, they support the opposite hypothesis.
* [[Sleeping beauty paradox]]: One half or one third? news://rec.puzzles cannot agree on a probability.
* Statistical paradox: It is quite possible to draw wrong conclusions from [[correlation]]. For example, towns with a larger number of churches generally have a higher crime rate — because both result from higher population. A professional organisation once found that [[economist]]s with a [[Doctor of Philosophy|Ph.D.]] actually had a lower average salary than those with a [[Bachelor of Science|BS]] — but this was found to be due to the fact that those with a [[Doctor of Philosophy|Ph.D.]] worked in [[academia]], where salaries are generally lower. This is also called a [[spurious relationship]].
* [[Low birth weight paradox]]: Low birth weight babies have a higher mortality rate, babies of smoking mothers have lower average birth weight, babies of smoking mothers have a higher mortality rate, but low birth weight babies of smoking mothers have a lower mortality rate than other low birth weight babies.
* [[Two-envelope paradox]]: Given two envelopes, one of which contains twice as much money as the other, the benefit seems always to lie in switching from one to the other, and always sticking with your original choice.
==== Tak terhingga ====
* [[Burali-Forti paradox]]: If the [[ordinal number]]s formed a [[set]], it would be an ordinal number which is smaller than itself.
* [[Galileo's paradox]]: Though most numbers are not squares, there are no more numbers than squares. (See also [[Cantor]], [[Cantor's diagonal argument|Diagonal Argument]])
* [[Hilbert's paradox of the Grand Hotel]]: If a hotel with [[infinite]]ly many rooms is full, it can still take in more guests.
* [[Monty Hell problem]]: Positive daily profits yield zero assets in the (infinite) limit.
* [[Skolem's paradox]]: [[countable|Countably]] infinite models of [[Axiomatic set theory|set theory]] contain [[uncountable|uncountably]] infinite sets.
==== Geometri dan topologi ====
* [[Banach-Tarski paradox]]: Cut a ball into 5 pieces, re-assemble the pieces to get two balls, both of equal size to the first.
* [[Gabriel's Horn]] or Torricelli's trumpet: A simple object with finite volume but infinite surface area. Also, the [[Mandelbrot set]] and various other [[fractal]]s have finite area, but infinite perimeter (in fact, there are no two distinct points on the border of the Mandelbrot set that can be reached from one another by moving a finite distance along the border, which also implies that in a sense you go no further if you walk "the wrong way" around the set to reach a nearby point).
* [[Hausdorff paradox]]: There exists a countable subset C of the sphere S such that S\C is equidecomposable with two copies of itself.
* [[Smale's paradox]]: A sphere can, topologically, be turned inside out.
=== [[Psikologi]], aksi, dan alasan praktek ===
* [[Abilene paradox]]: People can make decisions based not on what they actually want to do, but on what they think that other people want to do, with the result that everybody decides to do something that nobody really wants to do, but only what they thought that everybody else wanted to do.
* [[Buridan's ass]]: How can a [[rationality|rational]] choice be made between two outcomes of equal [[value]]?
* [[Control paradox]]: Man can never be free of control, for to be free of control is to be controlled by oneself.
* [[Paradox of hedonism]]: When one pursues happiness itself, one is miserable; but, when one pursues something else, one achieves happiness.
* [[Newcomb's paradox]]: How do you play a game against an [[omniscient]] opponent?
* [[Kavka's toxin puzzle]]: Can one ''intend'' to drink the deadly toxin, if the intention is the only thing needed to get the reward?
* [[Socratic Paradox]]: One can never knowingly choose the lesser good or willingly do the wrong thing.
* [[Cursed Friend]]: If one is cursed into hurting one’s friends by just being with them, can one still be a friend and seek the other's company?
* [[Paradox of Denial]]: How can one accept oneself as one is, if one is not the way one thinks one should be? Yet, how does one effectively change oneself without accepting oneself as one is, and working from that?
* [[Hypocritical paradox]]: I hate hypocrites, but one thing I hate even more is intolerant hypocrites.
=== [[Fisika]]===
{{see details|physical paradox}}
* [[Braess' paradox]]: Sometimes adding extra capacity to a network can reduce overall performance.
* [[Carroll's paradox]]: the angular momentum of a stick should be zero, but is not
* [[D'Alembert's paradox]]: An [[viscosity|inviscid]] liquid produces no drag.
* [[Denny's paradox]]: Surface-dwelling [[arthropod]]s (such as the [[water strider]]) should not be able to propel themselves horizontally.
* [[Einstein-Podolsky-Rosen paradox]]: Can far away events influence each other in [[quantum mechanics]]?
* [[Gibbs paradox]]: In an [[ideal gas]], is [[entropy]] an [[extensive variable]]?
* The [[GZK paradox]]: High-energy [[cosmic ray]]s have been observed which seem to violate the [[Greisen-Zatsepin-Kuzmin limit]] which is a consequence of [[special relativity]].
* [[Loschmidt's paradox]]: Why is there an inevitable increase in entropy when the [[physical law|laws of physics]] are [[T-symmetry|invariant under time reversal]]? The time reversal symmetry of physical laws appears to allow the second law of thermodynamics to be broken.
* [[Mpemba effect|Mpemba paradox]]: Hot water can under certain conditions freeze faster than cold water, even though it must pass the lower temperature on the way to freezing.
* [[Olbers' paradox]] Why is the night sky black if there is an infinity of stars?
* [[Twin paradox]]: When the travelling twin returns, he is younger and older than his brother who stayed put.
* [[Black hole information paradox]]
* [[Supplee's paradox]]: the [[buoyancy]] of a [[relativistic]] object (such as a [[bullet]]) appears to change when the reference frame is changed from one in which the bullet is at rest to one in which the fluid is at rest
=== Filosofi ===
* [[Fermi paradox]]: If there are many other sentient species in the Universe, then where are they? Shouldn't their presence be obvious?
* [[Grandfather paradox]]: You [[time travel|travel back in time]] and kill your grandfather before he meets your grandmother which precludes your own conception and, therefore, you couldn't go back in time and kill your grandfather.
* [[Mere addition paradox]]: Is a large population living barely tolerable lives better than a small happy population?
* [[Nihilist paradox]]: If truth does not exist, the statement "truth does not exist" is a truth, thereby proving itself incorrect.
* [[Omnipotence paradox]]: Can an [[omnipotent]] being create a rock too heavy to lift? Can an irresistible force move an unmovable object?
* [[Predestination paradox]]: A man travels back in time and impregnates his great-great-grandmother. The result is a line of offspring and descendants, including the man's parent(s) and the man himself. Therefore, unless he makes the time-travel trip at all, he will never exist.
* Epicurean paradox, or [[Problem of evil]]: The existence of evil is incompatible with the existence of an omnipotent and caring God.
* [[Moore's paradox]]: "It's raining but I don't believe that it is."
* [[Zeno's paradoxes]]: When you reach the turtle's spot, it has already advanced a bit, so you can never catch it.
=== Ekonomi ===
* [[Abilene paradox]]: A group of people often has to decide against its own interests.
* [[Arrow's impossibility theorem|Arrow's paradox]]/[[Voting paradox]]/[[Condorcet paradox]]: You can't have all the attributes of an ideal [[voting system]] at once.
* [[Bertrand paradox (economics)|Bertrand paradox]]: Two players reaching a state of [[Nash equilibrium]] both find themselves with no profits.
* [[Bird in the bush]] paradox: Why are people so risk-averse?
* [[Diamond-water paradox]] Why is water cheaper than diamonds, when humans need water to survive, not diamonds?
* [[Edgeworth paradox]]: with capacity constraints, there may not be an equilibrium.
* [[Ellsberg paradox]]: A paradoxical result in experimental decision theory.
* [[Giffen good|Giffen paradox]]: Can increasing the price of bread make poor people eat more of it?
* [[Jevons paradox]]: Increases in efficiency lead to even larger increases in demand.
* [[St. Petersburg paradox]]: People will only offer a modest fee for a reward of [[infinite]] [[value]].
* [[Easterlin Paradox]]: Wealthier nations do not necessarily have higher proportions of "happy" people (as revealed by survey data).
== Referensi ==
* Quine, W. V. (1962). "Paradox". ''[[Scientific American]]'', April 1962, pp. 84–96.
* Clarke, Michael (2002). ''Paradoxes from A to Z''. London: Routledge.
== Lihat juga ==
* [[Benda tidak mungkin]]
* [[Kesalahan logika]]
* [[Tebakan]]
== Pranala luar ==
* {{en}} [[Open Directory Project]]: [http://www.dmoz.org/Society/Philosophy/Philosophy_of_Logic/Paradoxes/ Paradoxes] {{Webarchive|url=https://web.archive.org/web/20050404072025/http://www.dmoz.org/Society/Philosophy/Philosophy_of_Logic/Paradoxes/ |date=2005-04-04 }}
* {{en}} [http://www.dpmms.cam.ac.uk/~wtg10/richardsparadox.html Definability paradoxes]
* {{en}} [http://plato.stanford.edu/entries/insolubles Insolubles] ''(at the [http://plato.stanford.edu/ Stanford Encyclopedia of Philosophy])''
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