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Timeline for Is an nth root of unity a square?

Current License: CC BY-SA 2.5

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Oct 22, 2009 at 6:59 comment added user966 I want w to be a primitive 2n-th root. Can you give me a hint of how to prove the fact that you mentioned?
Oct 22, 2009 at 6:45 history answered S. Carnahan CC BY-SA 2.5