Fermat's Last Theorem : A Genetic Introduction to Algebraic Number Theory, Paperback by Edwards, Harold M.; Axler, S. (EDT); Gehring, F. W. (EDT); Ribet, K. A. (EDT), ISBN 0387950028, ISBN-13 9780387950020, Like New Used, Free P&P in the UK

This introduction to algebraic number theory via "Fermat's Last Theorem" follows its historical development, beginning with the work of Fermat and ending with Kummer theory of "ideal" factorization. In treats elementary topics, new concepts and techniques; and it details the application of Kummer theory to quadratic integers, relating it to Gauss theory of binary quadratic forms, an interesting connection not explored in any other book.