Galois theory is concerned with the study of polynomial equations and their symmetries. Given a polynomial equation, we can ask questions like: What are the roots of the equation? How do the roots relate to each other? Can we express the roots in terms of radicals (i.e., using only addition, subtraction, multiplication, division, and nth roots)?
If you’re interested in learning more about Galois theory, we recommend downloading Edwards’ PDF book, which is widely available online. With its clear explanations and numerous examples, Edwards’ book is an excellent resource for students and researchers alike. galois theory edwards pdf
Galois theory provides a powerful framework for answering these questions. At its core, the theory revolves around the concept of a Galois group, which is a group of permutations of the roots of a polynomial equation. The Galois group encodes the symmetries of the equation and provides a way to determine whether the roots can be expressed in terms of radicals. Galois theory is concerned with the study of