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Coincidence



 
 
Coincidence is the noteworthy alignment of two or more events or circumstances without obvious causal connection. The word is derived from the Latin co- ("in", "with", "together") and incidere ("to fall on").

The index of coincidence
Index of coincidence

In cryptography, coincidence counting is the technique of putting two texts side-by-side and counting the number of times that identical letters appear in the same position in both texts....
 can be used to analyze whether two events are related. A coincidence does not prove a relationship, but related events may be expected to have a higher index of coincidence.






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Coincidence is the noteworthy alignment of two or more events or circumstances without obvious causal connection. The word is derived from the Latin co- ("in", "with", "together") and incidere ("to fall on").

The index of coincidence
Index of coincidence

In cryptography, coincidence counting is the technique of putting two texts side-by-side and counting the number of times that identical letters appear in the same position in both texts....
 can be used to analyze whether two events are related. A coincidence does not prove a relationship, but related events may be expected to have a higher index of coincidence. From a statistical perspective, coincidences are inevitable and often less remarkable than they may appear intuitively. As an example, the probability of two individuals sharing a birthday already exceeds 50% with a group of only 23 (see the Birthday problem).

In The Psychology of the Psychic
The Psychology of the Psychic

The Psychology of the Psychic is a work by David Marks and Dr Richard Kammann, written while both were lecturers in psychology at New Zealand's University of Otago....
 the author David Marks
David Marks (psychologist)

David F. Marks is a psychologist and professor at City University, London in London, United Kingdom. Marks is largely concerned with three areas of psychological research - health psychology, cognitive psychology, and parapsychology....
 describes four distinct meanings of the term "coincidence". Marks suggests that coincidences occur because of "odd matches" when two events A and B are perceived to contain a similarity of some kind. For example, dreaming of a plane crash (event A) would be matched by seeing a news report of a plane crash on the next morning (event B).

In optics
Optics

Optics is the study of the behavior and properties of light including its optical phenomena with matter and its imaging by optical instruments....
, coincidence is also used to refer to two or more incident
Angle of incidence

Angle of incidence is a measure of deviation of something from "straight on", for example:* in the approach of a ray to a surface, or* the angle at which the wing or Stabilizer of an airplane is installed on the fuselage, measured relative to the axis of the fuselage....
 beams
Light beam

File:Hk-Symphony of Lights 3420.jpgA light beam or beam of light is a narrow projection of light energy radiating from a source into a beam....
 of light
Light

Light, or visible light, is electromagnetic radiation of a wavelength that is Visible spectrum to the human eye , or up to 380?750 nm. In the broader field of physics, light is sometimes used to refer to electromagnetic radiation of all wavelengths, whether visible or not....
 that strike the same point at the same time.

Remarkable coincidences sometimes lead to claims of psychic phenomena or conspiracy theories
Conspiracy theory

A conspiracy theory alleges a coordinated group is, or was, secretly working to commit illegal or wrongful actions, including attempting to hide the existence of the group and its activities....
. Some researchers (see Charles Fort
Charles Fort

Charles Hoy Fort was an United States writer and researcher into anomaly .Jerome Clark writes that Fort was "essentially a Satire hugely skeptical of human beings ? especially scientists ? claims to ultimate knowledge"....
 and Carl Jung
Carl Jung

Carl Gustav Jung was a Swiss psychiatrist, an influential thinker and the founder of Analytical psychology. Jung's approach to psychology has been influential in the field of depth psychology and in counterculture movements across the globe....
) have compiled thousands of accounts of coincidences and other supposedly anomalous phenomena (see synchronicity
Synchronicity

Synchronicity is the experience of two or more Event which are Causality occurring together in a supposedly Meaning manner. In order to count as synchronicity, the events should be unlikely to occur together by chance....
). The perception of coincidences often leads to occult or paranormal claims. It may also lead to a belief in fatalism
Fatalism

Fatalism is a philosophical doctrine emphasizing the subjugation of all events or actions to destiny or inevitable predetermination.Fatalism generally refers to several of the following ideas:...
, that events are pre-destined to happen in the exact manner of a prior plan or formula. This lends certain events an aura of inevitability.

Deepak Chopra
Deepak Chopra

Deepak Chopra is an Indian-American medical doctor and writer. He has written extensively on spirituality and diverse topics in mind-body medicine....
 and other proponents of ancient Vedic
Vedic

Vedic may refer to:* the Vedic, White Star Liner* the Vedas, the oldest preserved Indo-Aryan texts** Vedic Sanskrit, the language of these texts...
 spiritual and other mystical teachings insist on the fact that there is absolutely no coincidence in the world. That everything that occurs can be related to a prior cause or association, no matter how vast or how minute and trivial. All is impacted by something related to it that is unseen or seen, cognized or not in the universe. He and many others worldwide also suggest that science, in particular mathematics, is rapidly moving towards this conclusion as well. Nonlocality
Nonlocality

In physics, nonlocality is a direct influence of one object on another, distant object, in violation of the principle of locality.In classical physics, nonlocality in the form of action at a distance appeared in corpuscular theory and later disappeared in Field theory ....
 theory of physics is just the latest example of phenomenon that seemed coincidental, but are in fact causal. The claim is that this and other science and mathematical conclusions can extend this to every aspect of existence.

It has also been suggested that coincidence is just the mind connecting two or more unique events; if the mind does not make the connection then there is no coincidence. (Douglas 2005)

“It is no great wonder if, in the long process of time, while fortune takes her course hither and thither, numerous coincidences should spontaneously occur.”-Plutarch
Plutarch

Lucius Mestrius Plutarchus , c. AD 46 ? 120 ? commonly known in English as Plutarch ? was a Ancient Rome historian , biographer, essayist, and Middle Platonism....


Coincidences of Dimensions

In the mid-19th century the Swiss mathematician Ludwig Schläfli
Ludwig Schläfli

Ludwig Schl?fli was a Switzerland geometry and complex analysis who was one of the key figures in developing the notion of higher dimensional spaces....
 discovered the four-dimensional analogues of the Platonic solids, called convex regular 4-polytope
Convex regular 4-polytope

In mathematics, a convex regular 4-polytope is 4-dimensional polytope which is both regular polytope and convex set. These are the four-dimensional analogs of the Platonic solids and the regular polygons ....
s. There are exactly six of these figures; five are analogous/coincide with the platonic solids, while the sixth one, the 24-cell
24-cell

In geometry, the 24-cell is the convex regular 4-polytope, or polychoron, with Schl?fli symbol . It is also called an octaplex and polyoctahedron, being constructed of Octahedron Cell ....
, has no lower-dimensional analogue. In all dimensions higher than four, there are only three convex regular polytopes: the simplex
Simplex

In geometry, a simplex or n-simplex is an n-dimensional analogue of a triangle. Specifically, a simplex is the convex hull of a set of affine transformation Point s in some Euclidean space of dimension n or higher ....
, the hypercube
Hypercube

In geometry, a hypercube is an n-dimensional analogue of a Square and a cube . It is a Closed set, Compact space, Convex set figure whose 1-skeleton consists of groups of opposite parallel line segments aligned in each of the space's dimensions, at right angles to each other and of the same length....
, and the cross-polytope
Cross-polytope

In geometry, a cross-polytope, or orthoplex, or hyperoctahedron, is a regular polytope, convex polytope that exists in any number of dimensions....
. In three dimensions, these coincide with the tetrahedron, the cube, and the octahedron.

See also

  • Mathematical coincidence
    Mathematical coincidence

    In mathematics, a mathematical coincidence can be said to occur when two expressions show a near-equality that lacks direct theoretical explanation....
  • Delusions of reference
  • Coincidence theory
  • Bible code
    Bible code

    The Bible code, also known as the Torah code, is a cipher alleged to exist within the texts, that when decoded form words and phrases demonstrating foreknowledge and prophecy....
  • Littlewood's law
    Littlewood's law

    Littlewood's Law states that individuals can expect a miracle to happen to them at the rate of about one per month.The law was framed by University of Cambridge Professor J....
  • Post hoc ergo propter hoc
    Post hoc ergo propter hoc

    Post hoc ergo propter hoc, Latin for "after this, therefore because of this", is a Fallacy#logical fallacy which states, "Since that event followed this one, that event must have been caused by this one." It is often shortened to simply post hoc and is also sometimes referred to as false cause, coincidental c...
  • Forteana
  • Déjà vu
    Déjà vu

    D?j? vu or promnesia, is the experience of feeling sure that one has witnessed or experienced a new situation previously , although the exact circumstances of the previous encounter are uncertain....
  • Extra-sensory perception
    Extra-sensory perception

    Extrasensory perception is the apparent ability to acquire information by paranormal means independent of any known physical senses or deduction from previous experience....
  • Randomness
    Randomness

    Randomness is a lack of order, purpose, Causality, or predictability. Randomness as defined by Aristotle is the situation, when a choice is to be made which has no logical component by which to determine or make the choice ....
  • Reality shift
  • The Roots of Coincidence
    The Roots of Coincidence

    The Roots of Coincidence, written by Arthur Koestler, is an accessible introduction to theories of parapsychology, including extra-sensory perception and psychokinesis....
  • Synchronicity
    Synchronicity

    Synchronicity is the experience of two or more Event which are Causality occurring together in a supposedly Meaning manner. In order to count as synchronicity, the events should be unlikely to occur together by chance....
  • Serendipity
    Serendipity

    Serendipity is the effect by which one accidentally discovers something fortunate, especially while looking for something else entirely. The word has been voted as one of the ten English words that were Words hardest to translate in June 2004 by a United Kingdom translation company....
  • Coincidence Detection in Neurobiology
    Coincidence detection in neurobiology

    Coincidence detection in the context of neurobiology is a process by which a neuron or a neural circuit can encode information by detecting the occurrence of simultaneous yet separate input signals....
  • Omen
    Omen

    An omen is a phenomenon that is believed to foretell the future, often signifying the advent of change. Omens may be considered "good" or "bad", but the term is more often used in a foreboding sense, as with the word "ominous"....
  • Concurrency (road)
    Concurrency (road)

    A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different highway, motorway, or other road number....


External links

  • Understanding Uncertainty -
  • Austin Society to Oppose Pseudoscience -
  • Skeptic - by David G. Myers
  • Psychology Today
    Psychology Today

    Psychology Today is a bi-monthly magazine published in the United States. It is a psychology-based magazine about relationships, health and related topics written for a mass audience of non-psychologists....
     - by Jill Neimark
    Jill Neimark

    Jill Neimark is an United States of America writer.Neimark has written one adult novel, a thriller titled Bloodsong,, which was published in both hardcover and paperback and translated into German language, Italian language, and Hebrew language....