Duality (mathematics), a mathematical concept
Dual (category theory), a formalization of mathematical dualityDuality (order theory), a concept regarding binary relationsDuality (projective geometry), general principle of projective geometryS-duality (homotopy theory)Duality (optimization)List of dualities (Mathematics)
Philosophy, logic, and psychology
Dualism, a twofold division in several spiritual, religious, and philosophical doctrinesDualism (philosophy of mind), where the body and mind are considered to be irreducibly distinctDe Morgan's Laws, specifically the ability to generate the dual of any logical expression.
Science
Electrical and mechanical
Duality (electrical circuits), regarding isomorphism of electrical circuitsDuality (mechanical engineering), regarding isomorphism of some mechanical laws
Physics
AdS/CFT correspondence, (anti de Sitter/conformal field theory correspondence), sometimes called the Maldacena dualityDual resonance modelDuality (electricity and magnetism)Englert–Greenberger duality relationHolographic dualityKramers–Wannier dualityList of dualities (physics)Mirror symmetryMontonen–Olive dualityMysterious dualityString duality is a class of symmetriesS-dualityT-dualityU-dualityWave–particle duality
Titles
Film
Duality (film), a Star Wars fan film by Dave Macomber and Mark Thomas
Music
Duality (Lisa Gerrard & Pieter Bourke album), a 1998 album by Lisa Gerrard and Pieter BourkeDuality (song), a 2004 single & Grammy-nominated song by metal band SlipknotDuality (Ra album), a 2005 album by the rock band RaDuality, a 2007 single from alternative rock/punk band Bayside
Other
Duality, a large format audio mixing console by Solid State LogicDuality (CoPs) refers to the notion of a duality in a Community of PracticeDual (grammatical number) grammatical number that some languages use in addition to singular and plural
