# Duality

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**Duality** may refer to:

## MathematicsEdit

- Duality (mathematics), a mathematical concept
- Dual (category theory), a formalization of mathematical duality
- Duality (optimization)
- Duality (order theory), a concept regarding binary relations
- Duality (projective geometry), general principle of projective geometry
- Duality principle (Boolean algebra), the extension of order-theoretic duality to Boolean algebras
- S-duality (homotopy theory)

- List of dualities § Mathematics

## Philosophy, logic, and psychologyEdit

- Dualistic cosmology, a twofold division in several spiritual and religious worldviews
- Dualism (philosophy of mind), where the body and mind are considered to be irreducibly distinct
- De Morgan's laws, specifically the ability to generate the dual of any logical expression
- Complementary duality of Carl Jung's functions and types in Socionics

## ScienceEdit

### Electrical and mechanicalEdit

- Duality (electrical circuits), regarding isomorphism of electrical circuits
- Duality (mechanical engineering), regarding isomorphism of some mechanical laws

### PhysicsEdit

- AdS/CFT correspondence (anti de Sitter/conformal field theory correspondence), sometimes called the Maldacena duality
- Dual resonance model
- Duality (electricity and magnetism)
- Englert–Greenberger duality relation
- Holographic duality
- Kramers–Wannier duality
- List of dualities § Science: Physics
- Mirror symmetry (string theory)
- Montonen–Olive duality
- Mysterious duality
- String duality, a class of symmetries
- Wave–particle duality

## MusicEdit

### AlbumsEdit

*Duality*(Peter Leitch and John Hicks album), 1994*Duality*(Lisa Gerrard and Pieter Bourke album), 1998*Duality*(Ra album), 2005*Duality*(mixtape), 2012*Duality*, a 2014 album and song by orchestral pop-punk band Set It Off*Duality*, a 2009 album by Darker Half*Duality*, a 2020 album by Duke Dumont*Duality*, a 2018 album by Big Scoob

### SongsEdit

- "Duality", a 2014 single from pop rock/punk rock band Set It Off
- "Duality" (song), a 2004 single & Grammy-nominated song by metal band Slipknot
- "Duality", a 2007 single from alternative rock/punk band Bayside

## OtherEdit

*Duality*(film), a 2001 Star Wars fan film by Dave Macomber and Mark Thomas- Duality, a large format audio mixing console by Solid State Logic
- Duality (CoPs), refers to the notion of a duality in a Community of Practice
- Dual (grammatical number), grammatical number that some languages use in addition to singular and plural

## See alsoEdit

- Double (disambiguation)
- Dual (disambiguation)
- Duality principle (disambiguation)
- List of dualities: philosophy, mathematics, physics and engineering
- Nondualism (philosophy)
- Triality (mathematics)

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