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A 'dual' is a pair or a grouping of two. "Dual" is also the name for many things:

★ For several meanings of "dual" in mathematics, see duality (mathematics)

★ In some languages, in addition to the singular and plural numbers there is also a ''dual'' number, which is used when exactly two people or things are meant.

★ A dual troll or secondary account on a message board for a number of typically neferious purposes used for internet trolls

★ A simultaneous application of a P-type and N-type fertilizer

★ Diffusing update algorithm (DUAL) is a component of the routing-protocol EIGRP for route calculation

★ DUAL Cognitive Architecture

★ ''Dual'' is a brand name for Hifi equipment, mostly known for vinyl record players.

★ ''Dual!'' is the name of an anime series, Dual! Parallel Trouble Adventure

★ A person who has both an alcohol or drug problem and an emotional/psychiatric problem is said to have a dual diagnosis. To recover fully, the person needs treatment for both problems.

★ A special DUAL table used in the Oracle database.

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See also

Please note

See also

★ dual (electronics)

★ dual wavelet

★ duality

★ duality (mathematics) and the use of dual in Boolean algebra

★ dual polyhedron

★ DUAL the film

★ DUAL Ostrout

Please note

★ duel