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Principal root of unity

From Wikipedia, the free encyclopedia

In mathematics, a principal n-th root of unity (where n is a positive integer) of a ring is an element satisfying the equations

In an integral domain, every primitive n-th root of unity is also a principal -th root of unity. In any ring, if n is a power of 2, then any n/2-th root of −1 is a principal n-th root of unity.

A non-example is in the ring of integers modulo ; while and thus is a cube root of unity, meaning that it is not a principal cube root of unity.

The significance of a root of unity being principal is that it is a necessary condition for the theory of the discrete Fourier transform to work out correctly.

References

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  • Bini, D.; Pan, V. (1994), Polynomial and Matrix Computations, vol. 1, Boston, MA: Birkhäuser, p. 11