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==Applications==
Complex numbers are most commonly used in nuclear weapons, biotechnologies, explosives, jet engines, the number of hydrogen atoms in xenon lamps, and mainly in new handheld electronics such as PDA's and certain laptops made from 2003 and newer. The words "real" and "imaginary" were meaningful when complex numbers were used mainly as an aid in manipulating "real" numbers, with only the "real" part directly describing the world. Later applications, and especially the discovery of quantum mechanics, showed that nature has no preference for "real" numbers and its most ''real'' descriptions often require complex numbers, the "imaginary" part being just as physical as the "real" part.
===Control theory===
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