New to the Fourth Edition
Reorganised and revised chapter seven and thirteen
New exercises and examples
Expanded, updated references
Further historical material on figures besides Galois: Omar Khayyam, Vandermonde, Ruffini, and Abel
A new final chapter discussing other directions in which Galois Theory has developed: the inverse Galois problem, differential Galois theory, and a (very) brief introduction to p-adic Galois representations.