Chapter 14 of Dummit and Foote’s Abstract Algebra focuses on , covering fundamental concepts like field automorphisms, the Fundamental Theorem of Galois Theory, and the solvability of polynomials by radicals.
The chapter begins by introducing the concept of a representation of a group $G$ on a vector space $V$. A representation is a homomorphism $\rho: G \to GL(V)$, where $GL(V)$ is the general linear group of invertible linear transformations on $V$. The authors illustrate this concept with several examples, including the regular representation of a group and the representation of $SO(2)$ on $\mathbbR^2$. Dummit And Foote Solutions Chapter 14