Dummit And Foote Solutions Chapter 14 Review

Solution:

Let $f(x) = x^3 - 2 \in \mathbb{Q}[x]$. Compute the Galois group of $f(x)$ over $\mathbb{Q}$. Dummit And Foote Solutions Chapter 14

The roots of $f(x)$ are $\sqrt[3]{2}, \omega\sqrt[3]{2}, \omega^2\sqrt[3]{2}$, where $\omega$ is a primitive cube root of unity. The splitting field of $f(x)$ over $\mathbb{Q}$ is $\mathbb{Q}(\sqrt[3]{2}, \omega)$. The Galois group of $f(x)$ over $\mathbb{Q}$ is isomorphic to $S_3$, the symmetric group on 3 letters. Solution: Let $f(x) = x^3 - 2 \in \mathbb{Q}[x]$