Dual or Duals may refer to:
Paired/two things
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Dual (mathematics)
In mathematics, a duality translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one-to-one fashion, often (but not always) by means of an involution operation: if the dual of is , then the ...
, a notion of paired concepts that mirror one another
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Dual (category theory)
In category theory, a branch of mathematics, duality is a correspondence between the properties of a category ''C'' and the dual properties of the opposite category ''C''op. Given a statement regarding the category ''C'', by interchanging the sou ...
, a formalization of mathematical duality
*** see more cases in
:Duality theories
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Dual (grammatical number)
Dual (abbreviated ) is a grammatical number that some languages use in addition to singular and plural. When a noun or pronoun appears in dual form, it is interpreted as referring to precisely two of the entities (objects or persons) identified ...
, a grammatical category used in some languages
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Dual county
Dual county ( ga, Contae déach) is a term used in Gaelic games to describe a county that competes at a similar level in both hurling and Gaelic football. For example, Dublin play in Division 1 in both the NHL and NFL, while Laois compete in ...
, a Gaelic games county which in both Gaelic football and hurling
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Dual diagnosis
Dual diagnosis (also called co-occurring disorders (COD) or dual pathology) is the condition of having a mental illness and a comorbid substance use disorder. There is considerable debate surrounding the appropriateness of using a single categor ...
, a psychiatric diagnosis of co-occurrence of substance abuse and a mental problem
* Dual fertilization, simultaneous application of a P-type and N-type
fertilizer
A fertilizer (American English) or fertiliser (British English; see spelling differences) is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from ...
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Dual impedance
Dual impedance and dual network are terms used in electronic network analysis. The dual of an impedance Z is its reciprocal, or algebraic inverse Z'=\frac. For this reason the dual impedance is also called the inverse impedance. Another way of ...
, electrical circuits that are the dual of each other
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Dual SIM
Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone either allows users to switch between two separate mobile network services manually, has hardware support for keeping ...
cellphone supporting use of two SIMs
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Aerochute International Dual
The Aerochute International Dual, (formerly called the Two Seater) is an Australian powered parachute designed and produced by Aerochute International of Coburg North, Victoria. The aircraft is supplied as a kit for amateur construction.Be ...
a two-seat Australian powered parachute design
Acronyms and other uses
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Dual (brand)
Dual is a brand name of audio and video electronics.
History
In 1907, brothers Christian and Joseph Steidinger began manufacturing clockwork and gramophone parts in the Black Forest town of St. Georgen. In 1927, Gebrüder Steidinger (Steidinge ...
, a manufacturer of Hifi equipment
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DUAL (cognitive architecture) DUAL is a general cognitive architecture integrating the connectionist and symbolic approaches at the micro level. DUAL is based on decentralized representation and emergent computation. It was inspired by the Society of Mind idea proposed by Marvi ...
, an artificial intelligence design model
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DUAL algorithm The diffusing update algorithm (DUAL) is the algorithm used by Cisco's EIGRP routing protocol to ensure that a given route is recalculated globally whenever it might cause a routing loop. It was developed by J.J. Garcia-Luna-Aceves at SRI Internatio ...
, or diffusing update algorithm, used to update Internet protocol routing tables
* Dual language, alternative spelling of the Australian Aboriginal
Dhuwal language
Dhuwal (also Dual, Duala) is one of the Yolŋu languages spoken by Aboriginal Australians in the Northern Territory, Australia. Although all Yolŋu languages are mutually intelligible to some extent, Dhuwal represents a distinct dialect continu ...
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DUAL table The DUAL table is a special one-row, one-column table present by default in Oracle and other database installations. In Oracle, the table has a single VARCHAR2(1) column called DUMMY that has a value of 'X'. It is suitable for use in selecting a pse ...
, a special one-row and one-column database table
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Dual-Ghia
Dual-Ghia is a rare, short-lived, automobile make, produced in the United States between 1956 and 1958. The idea for a sporty limited production car came from Eugene Casaroll, who controlled specialized vehicle builder Dual-Motors Corporation ba ...
, US-brand of luxury-car of the late 1950s
Media
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''Dual'' (2008 film), a 2008 western drama film
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''Dual'' (2022 film), a 2022 science fiction thriller film
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"Dual" (''Heroes''), an episode of ''Heroes''
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Dual! Parallel Trouble Adventure
is a Japanese anime series animated by AIC and created by Masaki Kajishima, best known for the ''Tenchi Muyo!'' franchise. It was originally broadcast on Wowow from April to July 1999 and was licensed in the US by Pioneer LDC, later known as ...
, an anime series
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''Dual'' (album), an album of traditional Scottish and Irish music recorded by Éamonn Doorley, Muireann Nic Amhlaoibh, Julie Fowlis and Ross Martin, released 2008
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''Dual'' (EP), a 2013 EP by Sampha
* ''
Duals
''Duals'' is a compilation album by the Irish rock band U2. It was released in April 2011 to u2.com subscribers.
Track listing
:* "Where the Streets Have No Name" and "Amazing Grace" are studio mix of U2's performance at the Rose Bowl, Pas ...
'', an album by U2
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The Duals
The Duals were an American surf rock duo formed in Los Angeles, California, in 1961. Much of the collaboration's music capitalized on the style of music popularized in Southern California in the early 1960s. They reached the national charts with ...
, American duo
See also
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Duality (disambiguation)
Duality may refer to:
Mathematics
* Duality (mathematics), a mathematical concept
** Dual (category theory), a formalization of mathematical duality
** Duality (optimization)
** Duality (order theory), a concept regarding binary relations
** Dual ...
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Duel (disambiguation)
A duel is a pre-arranged, private fight between two persons to settle a point of honour or personal quarrel.
Duel may also mean more than one, i.e. 2. Most commonly used in the phrase COLAS Duel .LAW
Duel may also refer to:
Combat
*Duel, any c ...
, a homonym
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*
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Double (disambiguation)
A double is a look-alike or doppelgänger; one person or being that resembles another.
Double, The Double or Dubble may also refer to:
Film and television
* Double (filmmaking), someone who substitutes for the credited actor of a character
* ' ...
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Duo (disambiguation)
Duo may refer to:
Places
*Duo, West Virginia, an unincorporated community and coal town in Greenbrier County, West Virginia
*Duo, Tampere, a shopping centre in Hervanta, Tampere, Finland
* DUO, a twin-tower development in Singapore
Arts, enterta ...
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Pair (disambiguation)
Pair or PAIR or Pairing may refer to:
Government and politics
* Pair (parliamentary convention), matching of members unable to attend, so as not to change the voting margin
* ''Pair'', a member of the Prussian House of Lords
* ''Pair'', the Frenc ...
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Twin (disambiguation)
A twin is one of two offspring produced in the same pregnancy.
Twin may also refer to:
* Twin, Alabama, a city in the United States
* Twin, Belgium, Walloon name of the Belgium city of Thuin
* Twin (production team), a Swedish record production ...
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