Dual

Look up dual in Wiktionary, the free dictionary.

Dual may refer to:

Dual (mathematics), a notion of paired concepts that mirror one another
- Dual (category theory), a formalization of mathematical duality
- . . . see more cases in Category:Duality theories
Dual (grammatical number), a grammatical category used in some languages
Duality (electrical circuits)
Dual diagnosis, 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
DUAL (cognitive architecture), an artificial intelligence design model
DUAL algorithm, or Diffusing update algorithm, used to update Internet protocol routing tables
DUAL table, a special one-row and one-column database table
Dual SIM cellphone
Dual (brand), a manufacturer of Hifi equipment
Dual county, referring to a Gaelic Athletic Association county which traditionally competes at a similar level in both Gaelic football and hurling
2-tuple (Double), a list or sequence with two elements
Aerochute International Dual a two-seat Australian powered parachute design

Media

Dual (album), an album of traditional Scottish and Irish music recorded by Éamonn Doorley, Muireann Nic Amhlaoibh, Julie Fowlis and Ross Martin, released 2008
Dual (Sampha EP)
Dual (film), 2008
"Dual" (Heroes), an episode of Heroes
Dual! Parallel Trouble Adventure, an anime series
Duals, an album by U2