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Cyclotomic polynomial

Cyclotomic field

The roots of unity in $\mathbb Q(\zeta_n)$ form a cyclic group of order
$$
\operatorname{lcm}(2,n)=
\begin{cases}
n,&n\text{ even},\\
2n,&n\text{ odd}.
\end{cases}
$$


Roots of unity in a rational cyclotomic field

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Roots of unity in a rational cyclotomic field

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Roots of unity in a rational cyclotomic field

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