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 February 1st, 2018, 01:46 AM #1 Senior Member   Joined: Jan 2015 From: usa Posts: 104 Thanks: 1 Cyclic normal group Please help me to prove the following problem: Let $f\subset E$ be a Galois extension and assume that $E=F(\alpha)$ with $\alpha^n\in F$. Let $G=Gal(E/F)$. Show that $G$ has a cyclic normal subgroup $N$ of order dividing $n$ such that $G/N$ is abelian and has order dividing $\phi(n)$. Thanks. Last edited by skipjack; June 24th, 2018 at 07:21 AM.

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