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What is a primitive nth root of unity?

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Try: en.wikipedia.org/wiki/Primitive_nth_root_of_unity If there is a specific point that is unclear, perhaps you could edit your question to reflect a point you find confusing, that way you can get a better response. –  WWright Dec 8 '10 at 23:07
    
Where did you heard about it? –  AD. Dec 9 '10 at 6:22
    
I would not understand an up-vote, however I do not understand the down-votes either... –  AD. Dec 9 '10 at 6:25
    
No worries on the points. Ill try to ask better questions. –  Jason Smith Dec 9 '10 at 21:17
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1 Answer

up vote 4 down vote accepted

Wikipedia says:

An nth root of unity, where n = 1,2,3,··· is a positive integer, is a complex number z satisfying the equation

$z^n = 1$.

An nth root of unity is primitive if it is not a kth root of unity for some smaller k: $z^k \neq 1 (k = 1, 2, 3, \ldots, n-1 )$

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