Paradox - philosophy. A paradox, also known as an antinomy, is a logically self-contradictory statement or a statement that runs contrary to ones expectation ..



A paradox, also known as an antinomy, is a logically self-contradictory statement or a statement that runs contrary to ones expectation. It is a statement that, despite apparently valid reasoning from true premises, leads to a seemingly self-contradictory or a logically unacceptable conclusion. A paradox usually involves contradictory-yet-interrelated elements - that exist simultaneously and persist over time.

In logic, many paradoxes exist which are known to be invalid arguments, but which are nevertheless valuable in promoting critical thinking, while other paradoxes have revealed errors in definitions which were assumed to be rigorous, and have caused axioms of mathematics and logic to be re-examined. One example is Russells paradox, which questions whether a "list of all lists that do not contain themselves" would include itself, and showed that attempts to found set theory on the identification of sets with properties or predicates were flawed. Others, such as Currys paradox, cannot be easily resolved by making foundational changes in a logical system.

Examples outside logic include the ship of Theseus from philosophy, a paradox which questions whether a ship repaired over time by replacing each and all of its wooden parts, one at a time, would remain the same ship. Paradoxes can also take the form of images or other media. For example, M.C. Escher featured perspective-based paradoxes in many of his drawings, with walls that are regarded as floors from other points of view, and staircases that appear to climb endlessly.

In common usage, the word "paradox" often refers to statements that are ironic or unexpected, such as "the paradox that standing is more tiring than walking".


1. Logical paradox

Common themes in paradoxes include self-reference, infinite regress, circular definitions, and confusion or equivocation between different levels of abstraction.

Patrick Hughes outlines three laws of the paradox:

Self-reference An example is the statement "This statement is false", a form of the liar paradox. The statement is referring to itself. Another example of self-reference is the question of whether the barber shaves himself in the barber paradox. Yet another example involves the question "Is the answer to this question No?" Contradiction "This statement is false"; the statement cannot be false and true at the same time. Another example of contradiction is if a man talking to a genie wishes that wishes couldnt come true. This contradicts itself because if the genie grants his wish, he did not grant his wish, and if he refuses to grant his wish, then he did indeed grant his wish, therefore making it impossible either to grant or not grant his wish without leading to a contradiction. Vicious circularity, or infinite regress "This statement is false"; if the statement is true, then the statement is false, thereby making the statement true. Another example of vicious circularity is the following group of statements: "The following sentence is true." "The previous sentence is false."

Other paradoxes involve false statements "impossible is not a word in my vocabulary", a simple paradox or half-truths and the resulting biased assumptions. This form is particularly common in howlers.

As an example, consider a situation in which a father and his son are driving down the road. The car crashes into a tree and the father is killed. The boy is rushed to the nearest hospital where he is prepared for emergency surgery. Upon entering the surgery-suite, the surgeon says, "I cant operate on this boy. Hes my son."

The apparent paradox is caused by a hasty generalization, for if the surgeon is the boys father, the statement cannot be true. On the other hand, the paradox is resolved if it is revealed that the surgeon is a woman - the boys mother - or the parents were a gay couple.

Paradoxes which are not based on a hidden error generally occur at the fringes of context or language, and require extending the context or language in order to lose their paradoxical quality. Paradoxes that arise from apparently intelligible uses of language are often of interest to logicians and philosophers. "This sentence is false" is an example of the well-known liar paradox: it is a sentence which cannot be consistently interpreted as either true or false, because if it is known to be false, then it can be inferred that it must be true, and if it is known to be true, then it can be inferred that it must be false. Russells paradox, which shows that the notion of the set of all those sets that do not contain themselves leads to a contradiction, was instrumental in the development of modern logic and set theory.

Thought-experiments can also yield interesting paradoxes. The grandfather paradox, for example, would arise if a time-traveler were to kill his own grandfather before his mother or father had been conceived, thereby preventing his own birth. This is a specific example of the more general observation of the butterfly effect, or that a time-travellers interaction with the past - however slight - would entail making changes that would, in turn, change the future in which the time-travel was yet to occur, and would thus change the circumstances of the time-travel itself.

Often a seemingly paradoxical conclusion arises from an inconsistent or inherently contradictory definition of the initial premise. In the case of that apparent paradox of a time-traveler killing his own grandfather, it is the inconsistency of defining the past to which he returns as being somehow different from the one which leads up to the future from which he begins his trip, but also insisting that he must have come to that past from the same future as the one that it leads up to.


2. Quines classification

W. V. Quine 1962 distinguished between three classes of paradoxes:

  • A paradox that 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.
  • A veridical paradox produces a result that appears absurd, but is demonstrated to be true nonetheless. Thus the paradox of Frederics birthday in The Pirates of Penzance establishes the surprising fact that a twenty-one-year-old would have had only five birthdays - if he had been born on a leap day. Likewise, Arrows impossibility theorem demonstrates difficulties in mapping voting results to the will of the people. One version of the Monty Hall paradox demonstrates that a decision which has an intuitive 50–50 chance is, in fact, heavily biased towards making a decision which, given the intuitive conclusion, the player would be unlikely to make. In 20th-century science, Hilberts paradox of the Grand Hotel and Schrodingers cat are famously vivid examples of a theory being taken to a logical but paradoxical end.
  • A falsidical paradox establishes a result that not only appears false but actually is false, due to a fallacy in the demonstration. The various invalid mathematical proofs e.g., that 1 = 2 are classic examples of this, often relying on a hidden division by zero. Another example is the inductive form of the horse paradox, which falsely generalises from true specific statements. Zenos paradoxes are falsidical, concluding, for example, that a flying arrow never reaches its target or that a speedy runner cannot catch up to a tortoise with a small head-start.

A fourth kind, which may be alternatively interpreted as a special case of the third kind, has sometimes been described since Quines work:

  • A paradox that is both true and false at the same time and in the same sense is called a dialetheia. In Western logics, it is often assumed, following Aristotle, that no dialetheia exist, but they are sometimes accepted in Eastern traditions and in paraconsistent logics. It would be mere equivocation or a matter of degree, for example, to both affirm and deny that "John is here" when John is halfway through the door, but it is self-contradictory simultaneously to affirm and deny the event.

3. In philosophy

A taste for paradox is central to the philosophies of Laozi, Zeno of Elea, Zhuangzi, Heraclitus, Bhartrhari, Meister Eckhart, Hegel, Kierkegaard, Nietzsche, and G.K. Chesterton, among many others. Soren Kierkegaard, for example, writes in the Philosophical Fragments that:

But one must not think ill of the paradox, for the paradox is the passion of thought, and the thinker without the paradox is like the lover without passion: a mediocre fellow. But the ultimate potentiation of every passion is always to will its own downfall, and so it is also the ultimate passion of the understanding to will the collision, although in one way or another the collision must become its downfall. This, then, is the ultimate paradox of thought: to want to discover something that thought itself cannot think.


4. In medicine

A paradoxical reaction to a drug is the opposite of what one would expect, such as becoming agitated by a sedative or sedated by a stimulant. Some are common and are used regularly in medicine, such as the use of stimulants such as Adderall and Ritalin in the treatment of attention deficit hyperactivity disorder also known as ADHD, while others rare and can be dangerous as they are not expected, such as severe agitation from a benzodiazepine.

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Paradox, Dialectic, and System: A Contemporary Reconstruction of.

Oct 18, 2018 The Great Silence: The Science and Philosophy of Fermis Paradox. American Journal of Physics 86, 878 2018. Epistemology: The Paradox of the Ravens video Khan Academy. Oct 27, 2015 Its a crucial insight from one of the founders of Western philosophy You should question everything you think you know. Indeed, the closer you. Some Paradoxes of Deterrence Penn Law. Sep 18, 2009 Wittgensteins Paradox of Ordinary Language. Wittgensteins Philosophical Investigations Wittgenstein, 1958, relies on reference to a non. Paradox Lost Logical Solutions to Ten Puzzles of Philosophy. Professor. Philosophy. Massachusetts Institute of Technology. Agustin Rayo M.I.T. explains.

The Raven Paradox Is a Confusing Philosophical Conundrum.

Hard Shots by Six Pack Philosophy is a shorter show about the philisophical side of politics and news in America. In Six Paradox Of Tolerance Hard Shots. Paradox Is at the Heart of Human Nature Burning Man Journal. Apr 7, 2019 Emily Thomas is an Assistant Professor in Philosophy at Durham University god, and classic philosophical problems such as Zenos paradox,. Paradox of Sufficient Reason The Philosophical Review Duke. There are many famous examples of paradox from logicians and philosophers. One of the most famous paradoxes is called the liars paradox, and is evident in. Socratic paradox Oxford Reference. Jul 30, 2011 This paper provides some philosophical comments on Roses prevention paradox, suggesting why that paradox seems so difficult, and why.

Leibniz and Deleuze on Paradox JHI Blog.

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