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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—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
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—Willard Van Orman Quine (b. 1908)