Definition
An nth root of unity, where n = 1,2,3,ยทยทยท is a positive integer, is a complex number z satisfying the equation
An nth root of unity is primitive if it is not a kth root of unity for some smaller k:
Read more about this topic: Root Of Unity
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—The Columbia Encyclopedia, Fifth Edition, the first sentence of the article on “life” (based on wording in the First Edition, 1935)
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—Ralph Waldo Emerson (1803–1882)
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—Nadine Gordimer (b. 1923)