Since 1973, Galois Theory has been educating undergraduate students on Galois groups and classical Galois theory. InGalois Theory, Fourth Edition, mathematician and popular science author Ian Stewart updates this well-established textbook for today’s algebra students.New to the Fourth Edition:- The replacement of the topological proof of the fundamental theorem of algebra with a simple and plausible result from point-set topology and estimates that will be familiar to anyone who has taken a first course in analysis- Revised chapter on ruler-and-compass constructions that results in a more elegant theory and simpler proofs- A section on constructions using an angle-trisector since it is an intriguing and direct application of the methods developed- A new chapter that takes a retrospective look at what Galois actually did compared to what many assume he did- Updated referencesThis bestseller continues to deliver a rigorous yet engaging treatment of the subject while keeping pace with current educational requirements. More than 200 exercises and a wealth of historical notes augment the proofs, formulas, and theorems.